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Copulatory organs of male crab. Black paper has been placed behind the ducts leading from the reproductive organs. A, vas-deferens duct leading from the testis out through the inner joint (coxopodite) of the leg to the intromittent organs; B, intromittent organs
Anatomy of the Oyster.
--From a model in the American Museum of Natural History. The right valve and mantle have been removed to thow the internal organs. The oyster may roughly be likened to a book, the valves of the shell representing the cover, the fleshy mantle closely lining the shell the first and last leaves, and the gills, running lengthwise beneath the large adductor muscle, the inner pages. Between the muscle and the hinge lies the heart, and above the gills the visceral mass, consisting of the cream-colored reproductive organs, whish are here pictured as round white masses, and the dark-colored digestive organs. Between the anterior end of the gills and the hinge are the palps, four fleshy flaps, similar in appearance to the gills. The microscopic plants which form the food of the oyster, are filtered out by the hairlike cilia of the gills, transferred to the palps, and passed into the mouth. A short esophagus leads into the stomach, which is surrounded by a dark-green gl
Mayflies: Ephemera viria Etn. 1. Lateral view of the nymph. Note the latero-dorsal breathing organs or gills on the abdominal segments; 2. Dorsal view of the nymph. This view shows how these organs may arch over the back; 3. Lateral view of the male imagop; 4. Dorsal view of the male imago
Siphturus alternatus Say.: 5. Lateral view of the nymph. This larva possesses a different type of abdominal breathing organs or gills; 6. Dorsal view of the nymph. This view shows the overlapping of the gills and also gives some hint of the number of trachae or air tubes, represented by black lines in each; 7. Lateral view of the male imago
Scientists preparing fish organs for examination, Bikini Atoll, 1947
Male and female dace during the spawning act. On the male, which is the fish with the body curved, are shown above the eye and in line with the nostril, four spine-like pearl organs and below them two smaller spines. Small organs are seen on the operculum and dorsal surface of the pectoral fin and on the caudal edges of the scales on the tail
Ventral view of adult male crab showing copulatory organs
Anatomy of the internal organs of a female gastropod, viewed from the dorsal side. The roof of the mantle cavity has been divided by a longitudinal incision and the flaps laid out, that on the left hand bearing the etenidium and osphradium, and that on the right the rectum and terminal part of the oviduct. The muscular dorsal wall of the body and the introvert have been divided so as tobring into view the anterior part of the alimentary canal and a portion of the nervous system. The buccal cavity has been tilted up and opened so as to show the odontophore, and the esohagus has been cut through near the anterior end...
Internal organs of a Holothurian, as seen when the body wall is divided along the middle of the dorsal surface
Distal parts of the intromittent organs of Phalloceros caudomaculatus. a, third anal ray; b, fourth anal ray; c, fifth anal ray
Luminous organs and lateral line of Midshipman, Porichthys notatus Girard. Family Batrachoididae. Monterey, California
Young Oysters furnished with locomotive organs
View of the left half of cistella (Argiope) neapolitiana, which has been cut in two by a median longitudinal incision, to show the disposition of the organs. Partly diagrammatic. The inorganic part of the shell only is shown. The tubular extensions of the mantle ad the organic outer layer are not indicated, and hence the pores appear open.
1. The ventral valve.
2. The dorsal valve.
e. The stalk.
4. The mouth.
5. Lip which overhangs the mouth and runs all round the tentacular arms.
7. Ovary in dorsal valve.
8. Liver diverticula.
9. Occlusor muscle; its double origin is snown.
10. Internal opening of left nephridium.
11. External opening of left nephridium.
12. Ventral adjustor. The line from 10 crosses the dorsal adjustor.
13. Divaricator muscle.
A, immediately after it is hatched: ad, adductor muscle; by, 'byssus' cord; s, sense organs; sh, shell
B, after it has been on the fish for some weeks: a.ad, p.ad, anterior and posterior adductors; al, alimentary canal; au.v, auditory vesicle; br, branchiae; f, foot; mt, mantle. (Balfour)
Generative and other organs of Littorina obtusata L., male
Generative and other organs of Littorina obtusata L., female
Stages in Development of the Oyster
Diagrams showing the growth of the various organs from egg to spat stages
Diagrammatic figure of oyster lying in left valve of shell and dissected to show internal organs, (after Leuckart and Nitsche); a, mouth; b, stomach; c c c, intestines; d, anus; g, gills by which the animal 'breathes'; f f f, edge of mantle lobe; e e e, shell; h, abductor muscle by which the two valves of the shell are closed; i, nerve; k k, kidney; l, labial palps or mouth plates; n n, liver; o o o, ovary; p, heart in pericardisl space; r, nerve of edge of mantle
Sturcture of the Breathing Organs of Porcellio scaber
A, Exopodite of first pleopod, showing the tuft of air-tubes ('pseudo-tracheae'), seen through the transparent cuticle; B, vertical section through same; C, part of section more highly magnified; art, Point of attachment of exopodite to peduncle; c, cuticle; gr, grooved area of cuticle; hy, hypodermis, or layer of cells under the cuticle; n, nucleus of hypodermis cell of air-tube; o, external opening; tr, air-tubes
Scopelus boops, a pelagic fish, with luminous organs
Astronesthes niger. The white spots in front of the eye are phosphorescent organs
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