( 13 ) 



Fig. 3. Drawing (natural size) of the bare patch on sac {sp., fig. 21) depending into 

 the common cavity of the uterus, and placed opposite to the os uteri 

 internum of Flatanista, 



5, 4. A portion of the chorion of Orcella brevirostris with, a bare surface occupied 

 by a pedunculated body {p. ), of natural size. 



55 5. The glandular body, of natural size, obtained from the allantois of Flata- 

 nista. See description of same in text. 



55 6. A portion of the umbiHcal cord of the Gangetic Dolphin Flatanista, of 

 natural size5 and showing the remarkable moniliform character of the 

 yessels. A slice of the wall has been taken away5 and three or four 

 enlargements or chambers are seen communicating by narrow orifices, 

 through which pointers have been introduced. 



55 7. A drawing magnified 2 diameters of a similar vascular dilatation to the 

 foregoing in one of the central vessels of the cord of Flatanista. 



55 8. Much enlarged view of two yellow bodies5 or supposed lymphatic sacs, I. s., 

 of the cord of Orcella^ occurring in the loose areas between the vessels, v. 



„ 9. A drawing illustrative of the sac and other bodies on the umbilical cord of 

 Orcella brevirostris. The part represented is at the bifurcation of the 

 vessels to the right and left cornua, and is about natural size : gl., hollow 

 glandular structure, with which at the upper end there communicates 

 (m.) a beaded or moniliform tube and inferiorly another vessel leading 

 to {I, h.), an opened lymphatic heart? ; I, Ti.^ a second smaller lymphatic 

 heart ? ; _^p. represent two of the pedunculated bodies described in the 

 text. 



5, 10. A representation, of natural size, of the manner in which the vessels of the 

 umbilical cord of Orcella intercommunicate obliquely the one with the 

 other. 



PLATE XXXV. 



Fig. 1. A drawing from nature, but reduced to Jrd of its original dimensions, of the 

 bare patch in the left horn of the chorion of Flatanista running along 

 the course of the umbilical vessels : d,, dorsal or anterior margin ; v., 

 ventral or posterior margin ; r., right pole ; Z., left pole ; c?., crypt where 

 the vessels break off ; p., small pedunculated body. 



„ 2. The surface of the chorion of Orcella brevirostris exhibiting patches of 

 bare spots : v,, blood-vessels traversing the membrane ; natural size. 



„ 3. A piece of the chorion of Orcella brevirostris enlarged 4 times natural size 

 to display a single bare spot and villous character of membrane around : 

 the bare surface was opposed to a bare surface of the uterus. 

 4. A piece of the uterus of Orcella brevirostris, showing the bare patches on 

 its mucous surface. Natural size. 



^5 5. A small portion of the same enlarged 4 times, and demonstrating a bare 

 spot occupied in its centre {u.), with orifice of the utricular gland. 



