INTEA-OVAEIAN EGG OF SOME OSSEOUS FISHES. 73 



represent an enlarged canal of the zona, but I have made no 

 direct observation to prove this assertion. According to Cun- 

 ningham the micropyle in Myxine glutinosa is formed by 

 the growth of a cellular process from the follicular epithelium 

 towards the vitelline while the vitelline membrane is being 

 formed. 



Another point which has still to be made out, is the ultimate 

 fate of the nucleus and the appearance of a " discus proli- 

 gerus " in the unfertilised egg. I hope, however, to make 

 additional researches at some future period, in order to clear 

 up these matters. 



EXPLANATION OF PLATE V, 



Illustrating Dr. R. Scharff's paper " On the Intra-ovarian Egg 

 of some Osseous Fishes." 



Fig. 1. — Intra-ovarian ova of Gadus seglefinus. (Zeiss D 3 .) »'. 

 Nucleoli. 



Fig. 2. — Intra-ovarian ovum of Trigla gurnardus. (Zeiss D 4 .) N. 

 Nucleus. »'. Nucleoli. 



Fig. 3. — Intra-ovarian ovum of Trigla gurnardus. (Zeiss D 4 .) 

 N. Nucleus. »' Nucleoli. ;;/•. Dai k protoplasmic ring. I. p. Light proto- 

 plasm. 



Fig. 4. — Nucleusof intra-ovarian ovum of Hippoglossides limandoides 

 (Zeiss D 4 .) ri. Nucleoli. 



Fig. 5. — Intra-ovarian ovum of Conger vulgaris. (Zeiss D 3 .) n'. 

 Nucleoli. 



Fig. 6.— Intra-ovarian ovum of Gadus virens. (Zeiss D 4 .) n . Nu- 

 cleoli. pr 1 . External protoplasmic ring. pr". Internal protoplasmic ring. 

 /. Follicle. /. p. Light protoplasm. 



Fig. 7. — Intra-ovarian ovum of Gadus virens. (Zeiss F 3 .) n'. Nu- 

 cleoli, n.f. Nuclear figure. N. m. Nuclear membrane, pr. Protoplasmic 

 ring. sp. Spots (nucleoli ?). f. Follicle. 



