'D' 



( 8 ) 



Fiff. 3, Portion of tlie duodenal sac of Flatanista, exhibiting two patches of race- 

 mose glands magnified 2 diameters. 



4. The yalvulse conniyentes of the small intestines at its duodenal end, about 

 natural size. 



5. The pancreas of Flatanista, Z., with its ducts laid open and showing their 

 relations to one another and to the ductus communis choledochus : i, 

 intestine; 5., stomach; o., orifice of ductus communis choledochus in 

 duodenum. Reduced. 



6. Interior of the common bile duct of Flatanista laid open, of natural dimen- 

 sions. It demonstrates an upper smooth mucous membrane, below 

 which commences sKght sacculation («.), becoming valvular towards 

 (^.), the intestinal extremity. 



7. The microscopic appearance of the upper patch of mucous cups or crypts of 

 the ductus communis choledochus in Flatanista, magnified about -^. 



8. The spleen and subjacent membrane in situ of the Susu, ^natural size. 



9. Opened splenic sacs and their subsidiary sacculi of the same animal ; these 

 dilatations being filled with a grumous substance, in the fresh condition. 

 Drawn of natural dimensions. 



10. Posterior or abdominal surface of the liver of the Platanista, |rd natural size : 

 Z., round ligament ; v, c, vena cava ; h., hepatic artery, duct, and portal 

 vein. 



11. The Flatanista^s caecum and accessory gland reduced \ : ccd.^ c^cal diverti- 

 culum ; i.y ileum ; c, colon in part ; ^., gland. 



PLATE XXVII. 



Pig. 1. Poreshortened anterior view of snout and opened mouth of the foetus of 

 Orcella b7^evirostris, J natural size : a., oral angle ; e., eye ; 6., upper labial 

 bristles ; t., tongue ; ph., pharyngeal aperture ; c?., mucous crypt on velum 

 palate ; p., palate. 



„ 2. Tongue and larynx removed from Orcella, Seen from above with portion 

 of buccal and f aucial or post-palatine soft parts spread out ; the apex 

 of glottis peering out of the posterior narial chamber. Reduced ^rd : 

 t., tongue ; p., papillae of post-lingual region ; g. o., patch of faucial gland 

 orifices ; a. e., aryteno-epiglottic cartilages or summit of glottis. 



„ 3. A portion of the faucial membrane of Orcella brevirostris spread out and 

 superficially dotted, with also papillary protuberances; the former (g, o.) 

 being the orifices of glands whose deep structure is displayed in the 

 succeeding figure. 



„ 4. The under-surface of the same piece of mucous membrane, showing the deep 

 elongated racemose glands (g.) continued from the superficial orifices in 

 question. This and fig. 3, both of natural dimensions. 



