312 N. M. Stevens. 



Fig. 37. Nucleus of egg near maturity, showing cast-out granules of chromatin- 

 like material. 



Fig. 38. Section through the two accessory fertilization cells (Oi an), show- 

 ing granular body (b) and spermatozoon (s) in the canal. 1.5 mm. -4. 



Fig. 39. Optical section of accessory cells in living egg of Sagitta inflata, show- 

 ing canal (c) and granular body (6). 2 mm.-4. 



Fig. 40. Section showing spermatozoon in second accessory cell. 1.5 mm. -4. 



Figs. 41 a and b. Two sections through the accessory cells of an egg of S. minima. 

 1 . 5 mm.-4. 



Fig. 42. Similar section from S. elegans. 1.5 mm.-4. 



Fig. 43. Sections from S. elegans, showing degeneration where an egg has 

 broken away without entering the oviduct. 1 . 5 mm.-4. 



Fig. 44. Section of the accessory cells of a young egg of S. inflata. 1.5 mm. -4. 



Fig. 45. Similar section of an older egg. 1 mm. -4. 



