Page 749. 
224 ON THE CCUM OF CANIS CANCRIVORUS. 
to the cecal end. ‘This condition obtains in almost all the Canide. 
In a specimen of OC. famelicus I find the cecum 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. canerivorus above mentioned the cecum 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 or otherwise typical of the genus (Fig. C). In other points 
of its anatomy no peculiarities were detected. In the tongue the cir- 
cumvallate papille were insignificant, three on each side, separated 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 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 cecum and the small intes- 
tine, the two latter being of equal diameter and scarcely smaller than 
the colon. The liver presented all the characteristics of Canis fami- 
liaris. In the generative organs, the prostate was fairly developed, 
and Cowper’s glands were absent; the os penis was deeply grooved, 15 
inch long, and slightly curved. 
That this animal is a true Canis is therefore clear; but that the 
peculiarities of the cecum are not certain characters to employ in 
classification in this case is evident, as is likewise the case with Nan- 
dinia binotata, which, as pointed out recently by Professor Flower,t 
is the only known iluroid animal which does not possess a cecum. 
It will be interesting to observe whether the other South-American 
Canide, all of which are peculiar in that the temporal ridges only meet 
across the skull for a very short distance at their posterior extremity 
(though some other species present this peculiarity) and are consider- 
ably separated in front, agree with Canis cancrivorus in the simplicity © 
and shortness of their ceca. 
* “Proceedings of the Zoological Society,” 1873, p. 198. (Supra, p. 154.) 
¢ Ibid. 1872, p. 683. 
