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1 millimeter in size, half buried in the sand. The animal is feeding, water passing in and out of the extended siphon, as shown by the arrows.
1 millimeter (1/25 inch) in length, attached to sand grains by the byssus (B). The ssipphon (S) consists of two parts, an incurrent encircle dby twelve tentacles, through which the water enters the mantle chamber of the animal, and an excurrent with four tentacles and filmy telescopic tube through which the water passes out of the mantle cavity. The byssus areises from a gland on the under side of the foot (ft).
Caddis Flies: 1. Dorsal view of larva of Molanna cinerea Hagen; 2. Lateral view of larva of M. Cinerea; 3. Lateral view of the pupa of M. Cinerea; 4. Dorsal view of imago of M. cinerea; 5. Accustomed resting position of the imago of M. cinerea; 6. Ventral view of the flat larval case of M. cinerea; 7. Lateral view of larva of POlycentropus lucidus Hagen showing the very long anal prolegs and the absence of gill filaments; 8. Lateral view of pupa of P. lucidus; 9. Dorsal view of imago of P. lucidus; 10. Larval case of P. lucidus; tube composed of sand and silk; the enlargement near the end is two-layered, and contains the pupa; 11. Eggs laid by P. lucidus female on a stick protruding from the water in a breeding cage
Captain Bartlett's Chart of the Siberian Coast and Bering Strait : 'After we had finished our second round of tea, they made signs to show that they wanted to know where we came from. I took out my charts, showed them where we drifted, pointed out Wrangell Island and told them of the men there, showed them where the ship sand and where we had just landed'
Cancale. The Barrier Oyster Park.
The water is seen slowly draining seaward, allowing the oysters in the higher parts to become exposed. The sides of the park are simple plank barriers. To the left are cases of elevage, well raised form the ground as a protection against shiftings of sand
Arcachon. An oyster park with low banks of fascine and clay
Cases of elevage are inclosed. The case covers are seen held open by propping sticks while the oysters are being sorted. The embankment separating the ponds are here composed of brush bundles, clay, and plank. The sand flat in the background is covered with Portuguese oysters
Plan of biological raft used at Monomoy Point for growth experiments and spat collecting. The raft, 20 feet long by 10 feet wide, provided with a central well and four trap-doors, was anchored to the Powder Hole in 20 feet of water. Wire cages and wooden boxes were suspended at various depths from the raft. Many kinds of mollusks were caught and raised in these spat boxes. The raft proved particularly useful in the study of the post-embryonic life history, as the scallops 'set' in large numbers on the boxes, cages and ropes, where specimens could be obtained in all stages of development for laboratory examination. Also, many interesting growth experiments upon the quahaug, scallop and clam were conducted in sand boxes
Photograph of the nest of a horned dace (Semotilus atromaculatus), taken with a reflecting camera and by the aid of a cloth screen.... The reflected image of part of the screen is seen over the right and left parts of the nest. In the upper part of the picture at the right above S.T. is the sand trail; to the left of this, above P, is the pit in the bottom of which are large pebbles; farther to the left, above G.R., is the gravel ridge with its top dressing of fine pebbles. The end of the ridge, its structure of coarse pebbles, is within the pit at the left
Showing the ceremonial behavior of the horned dace when a strange dace approaches the nest. The owner of the nest is seen in the pit P. Above this is the gravel ridge, G.R., and below it is the sand trail, S.T. The direction of the current is indicated by the arrow at the right. The course of the two fish upstream to the point X and the return of the owner to his nest are indicated by the broken lines with the arrowheads. The havey lines indicate the banks of the stream
View of interior of a car, showing filter of gravel and sand placed over one of the bottom windows. Arrangement ... for rearing very minute larvae, or those for which screen windows are dangerous. The car is calked tight; water is poured over the top by bucket chains...and its only exit is through this bottom filer
One of the usual dikes breaking through the shale along the plane of bedding. West of the Sand Beach
1, Dorataspis polyancistra (Haeck).
Euchitonia Berckmanni (Haeck.)
3, Spres spiculiferes
4, Spores sand spicules
Adult, summer plumage
Spoonbilled Sand Piper
Fur-Seal Industry of the Pribylov Islands, Alaska
Natives selecting a drive; view over hauling-grounds of 'holluschickie' at English Bay, looking west from Tolstoi sand dunes
Sauger or Sand Pike (Stizostedium canadense)
Showing the ceremonial behavior of the horned dace when a strange dace approaches the nest. The owner of the nest is seen in the pit P. Above this is the gravel ridge, G.R., and below it is the sand trail, S.T. The direction of the current is indicated by
Malaclemmys macrospilota, Male. Figs. 1 and 2, an adult from Sand Key, Florida.... Fig.3, Another individual from the same locality, showing tubercles on the ventral plates....
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