XIV LIST OF ILLUSTRATIONS. 



FISHING APPARATUS.* 



Page. 



Fig. 1.— Dredge for collecting fish eggs 42» 



EMBRYOGRAPHY OF FISHES, t 



Fig. 1. — Stages of development of Teleostei 563 



Plate T 576 



Fig. 1. — Unimpregnated egg of cod. 



2. — Protoplasmic germinal layer of same. 



3. — Protoplasmic layer of impreenated egg. 



4. — Stage between 2 and 3 shown in section. 



5. — Vitiline membrane showing micropyle. 



6. — Cod's egg J hour after impregnation. 



7. — Cod's egg 3 hours 40 minutes after impregnation 



8.— Algous growth attached to vitiline membrane of cod eggs. 



Plate U 678 



Fig. 9. — Cod's egg 8 hours after impregnation. 



10.— Germinal disk of cod's egg 9J hours after impregnation. 



11. — Cod's egg 23 hours after impregnation, side view. 



12. — Germinal disk of preceding viewed from below. 



13. — Cod's egg 45J hours after impregnation. 



14.— Cod's egg 4 days after impregnation. 



Plate III 580 



Fig. 15. — Cod's egg 7 days after impregnation, side view. 



16. — The same viewed from below. 



17.— Blastoderm of a cod's egg of the set^enth day in outline. 



18. — The same as preceding, in section. 



Plate IV 582 



Fig. 19.— Cods egg on the eighth day. 



20. — Cod's egg on the ninth day, side view. 



21. — The same viewed obliquely. 



22. — Embryo ten days old. 



23. — Embryo somewhat over ten days old. 



Plate V 584 



Fig. 24. — Tail of embryo cod on the thirteenth day, viewed from below. 



25. — The same seen obliquely from the side. 



20. — Embryo cod fourteen days old. 



27 — Head of an embryo eleven days old. 



28. — Head of an embryo seventeen days old, side view. 



Plate VI .. 586 



Fig. 29. — Head of embryo cod seventeen days old, viewed from below. 



30. — Head of embryo cod fifteen days old. 



Plate VU 588 



Fig. 31. — Embryo cod fourteen days after impregnation, side view in section. 



32. — Embryo cod sixteen days after impregnation, side view in section. 



Plate vm 590 



Fig. 33. — Transverse section near fin fold of embryo eighteen days old. 



33a. — Germinal disk of cod's egg. 



33&. — Germinal disk of shad's egg. 



34.— Embryo cod nineteen days after impregnation. 



Plate IX 592 



Fig. 35. — Germinal disk of cod's eggs 4 hours old. 



36. — Similar but abnormal egg. 



37. — Simular bat abnormaJ egg. 



38. — Germinal disk of cod's egg past second cleavage (abnormal). 



39.— Similar but normally developed. 



40. — Embryo cod 22 days after impregnation, side view. 



41. — Heart of the above. 



Plate X 594 



Fig. 42. — Embryo cod 21 days after impregnation, seen from below. 



43. — One of the lateral sensory elevations of the preceding specimen, 



44. — Germinal disk, first cleavage ofcod's egg. 



* In Hensen's Eeport on Eggs of Plaice, Flounder, and Cod. 



t In Ryder's Contribution to the Embryography of Osseous Fishes. 



