334 DR. MARTIN BARRY'S RESEARCHES IN EMBRYOLOGY. 



*. oil-like globules added to the envelope of granules : these objects mea- 

 sured y^^'" (Paris line) in length. 440 dlam. 

 Fig. 3. Cat (Felis Catus, Linn.). Stages more advanced (16.). These objects 



measured -^"' (Paris line) in length. 440 diam. 

 Fig. 4. Ox (Bos Taurus, Linn.). More than a hundred parasitic ovisacs {h) (5/.) 



in the field of view -^"' to -^"' (Paris line) (4.). In several of these ovi- 

 sacs the germinal vesicle is visible. 100 dlam. 

 Fig. 5. Sheep (Ovis Aries, Linn.). Ovisacs ^"' to ^"' (Paris line); one larger, ^"', 



containing an ovum. k. Stroma. 60 dlam. 

 Fig. 6. Cat {Felis Catus, Link.). Ovisacs Vo-'" (Paris line) and upwards. 100 dlam. 

 Fig. 7. Ditto. Some of the ovisacs seen in the last figure more highly magnified. 



g. Peculiar granules ; b. germinal spot ; c. germinal vesicle. 

 Fig. 8. Ditto. Two of the same ovisacs still more magnified. 440 dlam. 

 Fig. 9. Dog {Canis famlllaris, Linn.). Ovisacs -r^'" and upwards (in outline only). 



g. Peculiar granules, nearly as large as some of their containing ovisacs; 



h. proper membrane of the ovisac, very thick, and presenting folds in its 



contour (2. 7-)- 440 dlam. 

 Fig. 10. Cat {Fells Catus, Linn.). Parasitic ovisacs (57-) W to -rV'"- ^'- Pi'oper 



membrane of the ovisac (7.); 9- peculiar granules; c. germinal vesicle. 



Compare with fig. 21. from the Pigeon, and fig. 32. Plate VL fiom the 



Whiting. 240 diam. 

 Fig. 11. Man. Ovisac V-'"- g- Peculiar granules; h. proper membrane of the 



ovisac. 440 diam. 

 Fig. 12. Ditto. Ovisacs -^"', and upwards ; the minuter ones more spherical (3.) 



than the one in the last figure. The germinal vesicle (c) is visible in the 



largest of the ovisacs. IbO dlam. 

 Fig. 13. Cat {Fells Catus, Linn.). Parasitic ovisacs (57.) : the smallest s^'", the 



largest -^"'. b. Germinal spot ; c. germinal vesicle ; *. oil-like globules ; 



h. proper membrane of the ovisac. 440 dlam. 

 Fig. 14. Hog {Sus Scrofa, Linn.). Ovisac -^^-J". *. Oil-like globules surrounding 



the minute germinal vesicle; g. peculiar granules ; h. proper membrane 



of the ovisac. 240 dlam. 

 Fig. 15. Ditto. Incipient yelk (oil-like globules (*) and fluid). The germinal vesicle 



is concealed, g. Peculiar granules ; h. proper membrane of the ovisac. 



Compare with figs. 22. 23. and 24. from Birds. 240 dlam. 

 Fig. 16. Ditto. Membrana vitelli {e) partly visible. *. Oil-like globules, some of 



which closely surround and conceal the minute germinal vesicle; h. ovi- 

 sac. Compare with fig. 25. from the common Fowl ; fig. 34. Plate VI. 



from the Turbot ; and fig. 35. Plate VI. from the Salmon. 240 dlam. 

 Fig. 17. Cat {Fells Catus, Linn.). Thick and transparent chorion (/) just formed 



(52 — 56.). e. Membrana vitelli almost concealed by the chorion (the 



