1873.] 



C^CUM OF CANIS CANCRIVORUS. 



749 



upwards, and the appendix itself towards the observer, it is seen to 

 spring from the junction of the small and large intestines with an 

 abrupt turn to the left, which is followed very shortly by an equally 



A. Caecum of Canis famelicus. 



B. Caecum of Canis familiar is. 



C. Caecum of Canis cancrivorus. 



all one half natural size. 



sudden turn to the right, causing it to stand transversely to the 

 direction of the intestine ; a third bend to the left, above the others, 

 leads to the caecal end. This condition obtains, in almost all the 

 Canidae. In a specimen of C. famelicus I find the caecum much 

 shorter than usual, and forming one and a quarter turn of a spiral, 

 commencing by an upward turn to the left, and ending on the left 

 side of the spire (fig. A). The only other peculiarity that is generally 

 observed is that the third fold is less developed in some than in others. 

 But in the specimen of C. cancrivorus above mentioned the caecum is 

 much shorter than usual, being only 2 inches long in a nearly adult 

 male animal, and almost straight, not showing any tendency to the 

 folding on itself otherwise typical of the genus (fig. C). In other 

 points of its anatomy no peculiarities were detected. In the tongue 

 the circumvallate papillae were insignificant, three on each side, sepa- 

 rated by a considerable interval. The fourth lower molar characteristic 

 of the species (or genus Thous of Gray) was not developed, the 

 third being small and not above the gum. The undistended stomach 

 presented the characteristic form found in so many of the Carnivora 

 and figured in my account of the viscera of the Binturong *. The 

 spleen had a rudimentary third lobe. The small intestine was 5 feet, 

 and the large intestine 6 inches, in length ; and the latter seemed to 

 bifurcate symmetrically at its proximal end into the caecum and the 

 small intestine, the two latter being of equal diameter and scarcely 

 smaller than the colon. The liver presented all the characteristics 

 of Canis familiaris. In the generative organs, the prostate was fairly 



* P. Z. 8. 1873, p. 108. 



