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Fig.1.--Mature egg ready for union with male cell.
Fig.2.--Spermatozoa (male cells). Note length of tail and shape of head. No attempts were made to study the minute anatomy.
Fig.3.--Egg, twenty-five minutes after fecundation, showing the two polar cells (pc) and the faintly developed yolk love.
Fig.4.--Egg just previous to the first cleavage, showing large yolk lobe.
Fig.5.--The two-celled stage at the completion of the first cleavage, fifty minutes after fecundation. The larger cell contains the yolk lobe.
Figs. 6,7,8,9.--This series illustrates the process of cleavage in the egg during the change from the two-celled to the four-celled stage.
Fig.10.--The four-celled stage, one hundred and ten munites after fecundation. Side view.
Figs. 11,12.--The eight-celled stage, one hundred and forty-five minutes after fecundation.
Fig.13.--The sixteen-celled stae, one hundred and eighty-five munites after fecundation. Side view.
Conger Eel : Embryo Freed from its membrane, showing continued constriction of anterior end of yolk and general diminuition of the enlarged anterior portion of yolk with the corresponding increase of caudal portion of yolk. August 2, 7:30 a.m.
Conger Eel : Outline of enlarged part of the yolk and yolk sac of an embryo...from below
Diagram of a Pelagic Egg
O.G. Oil Globule; Y. Yolk; G. Germ Disc; M. Micropyle (the small opening through which fertilization takes place)
Pleuronectes flesus, Young Flounder taken in Mevagissey Harbour, Aporil 2, 1889... pw, pelvid fin (1); Pleuronectes limanda, Larva of dab...new hatc hed, from artificially fertilised egg, March 11, 1889. pt, pectoral fin; yk, yolk (2); Pleuronectes microcephalus, Larva of Merry Sole, March 25, 1889, four days after hatching, from artificially fertilised egg; l, liver; ht, heart (3); Pleuronectes platessa, Larva of Plaice..., February 27, 1889, five days after hatching, from artificially fertilised egg; a, anus; nch, notochord (4); Rhombus laevis, Young brill, taken at surface of water in Sutton Pool, June 1, 1889 (5)
Solea variegata : Larva of Thickback Newly hatched, April 24, 1889... Pigment as seen by reflected light. yk: yolk (1); Solea variegata : Larva...two days after hatching, April 23, 1889... Pt, pectoral fin; ht, heart (2); Pleuronectes flesus : Larva of flounder (Pleuronectes flesus) two days after hatching, February 20, 1889, from egg artificially fertilised (3); Pleuronectes flesus : Larva...six days after hatching, February 24, 1889...; same magnification (4); Pleuronectes flesus : Young flounder taken in Mevagissey Harbour, April 2, 1889; drawn April 5.... (5)
Pleuronectes flesus, Young Flounder taken in Mevagissey Harbour, Aporil 2, 1889... pw, pelvid fin (1); Pleuronectes limanda, Larva of dab...new hatc hed, from artificially fertilised egg, March 11, 1889. pt, pectoral fin; yk, yolk (2); Pleuronectes microc
Larval toadfish, showing formation of the color bands and disappearance of the yolk. Photographed in alcohol
Conger Eel : Head and anterior part of body, showing the continued reduction of the yolk and the very large fourth ventricle. August 5
Conger Eel : Embryo freed from its membrane, showing beginning of the constriction of yolk at its anterior end. August 1
Conger Eel : Outline of embryo showing position in membrane and shape of the yolk. August 1
Ctenogobius stigmaticus : Egg with blastoderm growing round yolk, shortly before closure of blastopore, 5 hours after fertilization
Ctenogobius stigmaticus : Egg with fully developed blastodisc (BD); Y, yolk
Gambusia Affinis: Embryo with yolk sac nearly absorbd, removed from ovarian follicle
Anchovia mitchilli: Egg showing blastoderm spreading over yolk; gr, germ ring
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