( 12 ) 



Fig. 2. The outer genital aperture of the same young female displayed as an anato- 

 mical preparation, and held open by a style to show specially cZ., the 

 clitoris. Drawn of natural dimensions. 

 „ 3. An abdominal view of the unimpregnated uterus of Flatanista reduced to 

 ^rd natural size : ^., portion of rectum ; u., uterus ; o., ovary ; fm,, fim- 

 briated extremity, pavilion and orifice of the fallopian tube ; 6., urinary 

 bladder ; po,, pouch or peritoneal diverticulum alongside the neck of the 

 bladder. Eeduced. 

 5, 4. Sketch of the foetus of Flatanista gangetica from a photograph J natural 

 size. Dorsal view and reduced to scale ^rd of the natural size of the 

 animal : 5., blow-hole; d. /., dorsal fin; c, coil of the umbilical cord. 



PLATE XXXIII. 



Eig. 1. The genitalia and foetus in utero of Orcella brevirostris, reduced Jrd natural 



size : r. h., the empty right horn of the uterus, the left is opened, exposing 



the young animal m situ and bent upon itself ; am., amniotic sac ; c, 



umbilical cord ; t., tail twisted in a corner of the folds of the cavity ; 



b., position of blow-hole ; ^., hairs or bristles of snout ; m. g., mammary 



gland uncovered ; m., the external mammary slit, the nipple being hidden 



in the slit ; v., vulval cleft ; pe., perinseum ; a., anus ; /., fallopian tube ; 



/m., its fimbriated extremity. 



„ 2. A sketch of the os uteri internum of grsbYiAoi O.bi^evirostris,^ naiuYsl size, 



„ 3. The inner uterine surface and opening of the fallopian tube (/. ) of the 



same cetacean, and about natural size. 



PLATE XXXIV. 



Fig. 1. A deep view of the pregnant uterus and neighbouring parts of Flatanista 

 {see text) seen with part of the left cavity wall removed, the whole 

 reduced to liln of its original magnitude : le., interior of left horn ; pa,, 

 passage leading to rh., the right uterine horn ; o,, ovary of left side ; 

 r., rectum cut short. 

 „ 2. Eoetal envelopes of Flatanista gangetica, reduced to ^th their natural size. 

 The smaller right horn is turned forwards to show the uterine pouch, the 

 larger gravid left horn has its chorionic membrane slit open : ch., cho- 

 rion ; am,, amnion ; t., termination of the amniotic sac on the right side ; 

 al., allantoid, showing dots or specks which represent the amniotic 

 corpuscles; /. o., pole corresponding to left fallopian orifice; c., umbilical 

 cord ; b, s., position of one of the bare spots of right chorion, viz,, that 

 corresponding to the mouth of the fallopian tube; sp., sac which depends 

 into common cavity of uterus. 



