( 17 ) \ 



transverse section cuts tlirongh. a corpus luteum {g.I.): o., ovum:/., 

 empty follicle from wliich the ovum has escaped (possibly in making 

 the section) ; stroma of the ovary; J9.5., pale band described in text. 

 Magnified 12 diameters ; a., a highly magnified representation of the cells 

 composing the medullary stroma. 

 Eig. 12. A vertical section of a small piece of the chorion of JPlatanista cutting 

 through (5.) a bare spot, on either side of which are villous processes 

 (v. p.), capillary vessels (v.) penetrating these. Magnified 12 diameters. 



„ 13. Superficial view of a bare spot of the chorion of P. gangetica, with the 

 blood-vessels injected. Enlarged about 10 times natural size. 



„ 14. A small portion of the chorion from the non- gravid horn of the uterus of 

 Orcella h^evirostris. Shown in vertical section, and enlarged 6 times 

 natural size. 



„ 15. A little piece of the amnion of Flatanista exhibiting the so-called grey 

 bodies {g. b.) in situ, in the otherwise granular membrane : x 25 diame- 

 ters : a., three of the club-shaped, crystalline constituents composing the 

 grey bodies, and highly magnified. 



5, 16. A section of the gland-like body (or hippomanes) from the allantois of the 

 Gangetic Dolphin {Flatanista). The various-shaped crystalline parti- 

 cles are distributed throughout the meshes of the corpuscular network. 

 Highly magnified. 



PLATE XXXYIII. 



Chiefly devoted to a microscopical exposition of the female genital passages 

 and cavities and the utricular glands of Flatanista and Orcella. 

 Ei^. 1. A section through the wall of the uterus of the foetal Flatanista. En- 

 larged about 6 times natural size. 



2. A segment of the previous section, highly magnified : g., glandular and 



epithelial layer, u. being the utricular glands; c, connective tissue or 

 submucous layer ; m., muscular coat ; fv., jihrovascular layer ; fs., fibro- 

 serous investment. 



3. A segmental section of the wall of the common cavity pf the uterus of 



Orcella hrevirostris : m.f., mucous folds and free villous surface; u. g., 

 utricular glands ; v., vascular area in the connective tissue. Enlarged 

 8 diameters. 



4. A portion of a vertical section of the corun of the uterus of the virgin Fla- 



tanista. Enlarged about 18 diameters. This shows a plentiful deve- 

 lopment of utricular glands : g., glandular and epithelial layer ; c, con- 

 nective tissue and capillaries ; m.f.s., muscular, fibrovascular, and serous 

 layers. 



5. A section through the wall of the virgin uterus of Orcella, and wherein no 



utricular glands are visible. Enlarged about 8 times natural size. 



