DR. MARTIN BARRY'S RESEARCHES IN EMBRYOLOGY. 339 



{h i) the Graafian vesicle, being conveyed by (g"^) the retinacula. g^. Tu- 

 nica granulosa ; g^^. menibrana granulosa. Contrast with fig. 62. Plate VII. 

 and with fig. 80. Plate VIII. from Baer (62. 63. 91.). The "cumulus" of 

 Baer (central portion of the retinacula) is well seen in this figure. 60 diam. 



Fig. 56. Ox (Bos Tavrus, Linn.). The ovum (/) (in its tunica granulosa) at the 

 periphery of {h i) the Graafian vesicle, being retained there by {g"^) the 

 retinacula (86.). The other objects as in the last figure. It is the under 

 surface of the ovum, &c. that is here seen. 60 diam. 



Fig. 57. Dog {Canis familiar is, Linn.). The ovum {f) apparently just reaching 

 the periphery of {h i) (a portion of) the Graafian vesicle, g"^. Retinacula; 

 g^. tunica granulosa; ^. membrana granulosa, part of which has been 

 removed (86.). 100 diam. 



Fig. 58. Ferret {Mustela i^wro, Linn.). The ovum (/) at the periphery of (h i) the 

 Graafian vesicle. ^2 j^eti^acula (80.) ; o^^ tunica granulosa ; c. germinal 

 vesicle. 100 diam. 



Fig. 59. Rabbit (Lepus Cuniculus, Linn.). The same objects, g^. Membrana gra- 

 nulosa, part of which has been removed (86.). 



Fig. 60. Ox (Bos Taurus, Linn.). The under surface of the central portion of the 

 retinacula (g"^) (" cumulus" of Baer) at the periphery of (h i) the 

 Graafian vesicle, k. Adherent stroma. 



Fig. 61 . Ditto. Fragment of the central portion of the retinacula (g^), from which 

 the granulous bands have been broken off, yet still containing the ovum 

 in its tunica granulosa (g^); the latter adherent to the walls of the cavity 

 in which it lies. (The drawing was taken as the object lay under the 

 microscope in a watch-glass.) 



Fig. 62. From Baer, " Vesicule de De Graaf (24. 25.) (de grandeur moyenne) 

 d'une truie, grossie dix fois ; dissequ^e suivant son axe. 



1. Surtout peritoneal (/). 



2. Tissu cellulaire (le stroma) (k). 



3. Couche externe (i) ^ , 1 1 1 1 >- . , 



, ^ , . ^ , ' I de la capsule de la vesicule 



4. Couche interne (n) > 1 ^^ \^< 



I de De Graaf. 

 X. X. ibtigmate J 



5. Membrane graiiuleuse {g^) 1 



6. Fluide contenu I du noyau de la vesicule de 

 7- Disque prolig^re [g"^) De Graaf." 



8. Ovule (/) 

 This figure, from Baer, is lettered so as to correspond with the other figures. 



Fig. 63. Rabbit (Lepus Cuniculus, Linn.). The retinacula (g^), with their mem- 

 brane, removed from the Graafian vesicle, g^. Tunica granulosa, with 

 its tail-like appendages (65.) ; /. chorion (ovum) ; d. yelk ; c. germinal 

 vesicle ; b. germinal spot. 240 diam. 



2x2 



