OVARY AND OVARIAN OVA IN CERTAIN MARINE FISHES. 161 



acid. Sections stained with liajmatoxylin. Zeiss C C, oc. 3, camera. 

 y. g. Yolk globules, o. g. Oil globules. 



Fig. 8. — Ovum of Trigla gurnardus, "37 mm. in diameter. From ripe 

 ovary fixed with picro-sulphuric acid and spirit. Sections stained with 

 Delafield's hsematoxylin. Zeiss C C, oc. 3, camera. 



Fig. 9. — Ovum of Trigla gurnardus, '53 mm. in diameter. From rip 

 ovary fixed with chromic acid 5 per cent. Sections stained with safranin 

 Zeiss C C, oc. 2, camera. 



Fig. 10.— Ovum of Rhombus maximus, -175 ram. diameter. From 

 ovary of a fish 1 ft. 9j in. long, obtained in the market April 12th. Fixed 

 with picro-sulphuric acid. Stained with Delafield's haimatoxylin. Zeiss 

 C C, oc. 3. 



Fig. 11. — Ovum of same species, -25 mm. diameter. From same series of 

 sections as Fig. 10. Zeiss C C, oc. 3. 



Fig. 12. — Ovum of same species, "35 mm. diameter. From same series of 

 sections as Fig. 10. Zeiss C C, oc. 3. 



Fig. 13. — Ovum of Solea vulgaris, '67 mm. diameter. From ovary of 

 a fish 16| in. long, obtained in the market September 20th, 1895. Fixed 

 with picro-sulphuric acid and spirit. Stained with haematoxylin. 



Fig. 14. — Ovum of Pleuronecles platessa, "33 mm. diameter. From 

 ovary of a large specimen taken from the Plymouth aquarium on August 17th. 

 Fixed with Lobianco's chromosmic mixture. Stained with Ehrlich's haema- 

 toxylin. Zeiss C C, oc. 3. v. n. Vitelline nucleus. 



Fig. 15. — Ovum of same species, "34 mm. diameter, in which the develop- 

 ment of yolk is more advanced. From the same ovary as that shown in the 

 preceding figure, but fixed with Kleinenberg's picro-sulphuric acid and stained , 

 with Delafield's hsematoxylin. Zeiss C C, oc. 3. 



PLATE 3. 



Fig. 16. — Portion of ovary of a spent sole, 17 in. long, from Grimsby 

 market August 1st, 1895. Examined in fresh condition. Zeiss A, oc. 3. 

 d. 0. Dead eggs, in which yolk development has proceeded to a certain stage. 



Fig. 17. — Portion of a section from an ovary of a spent plaice, 15J in. 

 long, obtained in the market at Plymouth February 2nd. Fixed with Flem- 

 ming's mixture. Stained with safranin. Zeiss A, oc. 3. fol. Empty 

 follicles, from which the ripe eggs have escaped. /. e. Follicular epithelium. 



Fig. 18. — An empty collapsed follicle from a section of the ovary of a 

 specimen of Trigla gurnardus, captured July 22nd in North Sea. Fixed 

 in picro-sulphuric acid and spirit. /. e. Follicular epithelium. /. w. Wall of 

 the follicle, b. v. Blood-vessel. 



VOL. 40, PART 1. — NEW SER. L 



