XIV LIST OF ILLUSTRATIONS. 



FISHING APPARATUS.* 



P.iige. 



Fig. 1.— Dredge for collecting fi.sli eggs 429 



EMBRYOGRAPHY OF FISHES.t 



Fig. 1. — Stages of development of Teleostei 563 



Plate 1 570 



Fig. ] . — Unimpregnated egg of cod. 



2. — Protoplasmic gorminal layer of same. 

 3. — Protoplasmic layer of impresnated egg. 

 '4. — Stage between 2 and 3 sliown in section. 

 5. — Vitiline membrane ebowing micropyle. 

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

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

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



Plate n 678 



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



10. — Germinal disk of cod's egg OJ 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 seventh day in outline. 

 18. — The same as preceding, in section. 



Plate IV 582 



Fig. 19.— Cod's 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. 

 26. — Embry\3 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 VII 588 



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

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



Plate Vin 690 



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

 33a. — Germinal disk of cod's egg. 

 33b. — 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 hoars old. 

 36. — Similar but abnormal egg. 

 37. — Simular but abnormai 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 804 



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 Report on Eggs of Plaice, Flounder, and Cod. 



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



