31 



rather towards the posterior side of the cavity ; these orifices were 

 about an inch in diameter, but the inferior orifice \vas the larger 

 of the two. The appendages were of the šame length, viz. 5 inches ; 

 the circumference of the anterior and superior \vas 5į inches, that 

 of the lower one 4^ inches ; but this difFerence in capacity depended 

 on the diiFerent statė of dilatation in the t\vo pouches ; for on laying 

 them open, the narrower one had its inner surface throvvn into nu- 

 merous small ruffCE, while very few appeared in the wider pouch in 

 conseąuence of the dilatation. Small ąuantities of comminuted sea- 

 weeds were found in both these receptacles. 



" The muscular coat of these pouches was one line and a half 

 thick, and arranged obliąuely. There were no particular glandular 

 appearances on the mucous coat. They seem to vary in their relative 

 dimensions in diiFerent individuals. In the small female Dugong 

 examined by Sir Everard Home, the posterior inferior pouch \vas seven 

 inches and a half in length, \vhile the other was only three inches, but 

 the diameter of the latter was twice that of the longer pouch. These 

 gastric ceBca are interesting from repeating so closely the structure 

 which characterizes the stomach of some of the lowest animals, in 

 which they sometimes represent the whole of the superadded gland- 

 ular apparatus of the digestive system. 



" The pyloric cavity of the stomach is, as I have before observed, 

 more likę an intestine, being elongated and narrow ; indeed this cir- 

 cumstance and the resemblance of the orifice of communication to a 

 true pyloms appear to have deceived the dissectors who fumished 

 Sir Stamford Raffles with the otherwise very accurate notes on the 

 anatomy of the Dugong, published in the llOth vol. of Phil. Trans., 

 1820, since they describe these appendages as opening into the sto- 

 mach near the junction of the duodenum ; but the true commence- 

 ment of that intestine is t\velve inches beyond the orifices of the 

 sacculi. The circumference of the i^yloric cavity at its commence- 

 ment was nine inches ; it dilated a little beyond the orifices of the 

 sacculi, and then gradually diminished to the pyloms, which is an 

 orifice of about half an inch diameter. The muscular coat of this 

 compartment of the stomach varies from two to three lines in thick- 

 ness, the longitudinal fibres \vhich run along the lesser curvature of 

 the preceding cavity are continued on the šame aspect of this one, 

 passing between the two sacculi, and apparently adapted so as to 

 close their orifices by drawing towards the cardia the part of the 

 stomach that is to the right of them. The inner membrane of the 

 pyloric cavity is similar to that of the cardiac, and is thrown into a 

 few rugce. 



" Beyond the pyloms the mucous membrane of the intestine isfor a 

 few inches slightly rugous likę that of the stomach, it is then throvvn 

 into decided transverse wavy rugce ; at five inches distance from the py- 

 loms the duodenum receives the biliary and pancreatic secretions on a 

 mammiUary eminence, three lines broad. Beyond this part the trans- 

 verse rugce are crossed by longitudinal ones, and the inner membrane 

 puts on a reticular appearance ; this dispositioncontinuesfor about six 



