230 RODENTIA. 



The kidney is conglobate, with only one mammilla. 



The heart was elongated and placed in the middle of the chest, the 

 point was slightly turned towards the left side. The right lung had 

 foixr lobes, the left only two. 



The tongue appeared narrower in the middle, and more elevated at 

 its posterior part than that of the rat ; the edges of the glottis were 

 serrated ; there were npon the palate eight furrows disposed nearly as 

 those of the rat, but those which were placed between the molar teeth 

 were less convex anteriorly. 



The water-rat has no well-defined scrotum ; sometimes the testicles 

 may be perceived on each side of the space which is between the anus 

 and the orifice of the prepuce • at other times one only is perceptible 

 externally; but in most of these animals the testicles remain in the 

 abdomen, at least to a certain age. The glans penis is large and cylin- 

 drical. The urethra is placed in the centre of a cavity which is at the 

 extremity of the glans ; and on each side of the latter, in the prepuce, 

 is a long and thin glandular body, the orifice of whose duct is seen on 

 the edge of the prepuce. The urinary bladder was of a pyriform shape, 

 and the testicles like an olive; the tubercle of the epididymis was 

 small, and its convoluted vessels very apparent. The vasa deferentia 

 were short but capacious. The vesiculae seminales formed an elongated 

 pouch, notched nearly as the comb of a cock is, and bent in a cruciform 

 manner at the extremity. "When opened, there issued a whitish matter 

 of some consistence. The prostates were large, and placed at the root 

 of the vesiculae seminales : they were of an irregular shape, each 

 composed of three lobes. 



The extremity of the rectum was surrounded by a gland, which 

 poured a milky matter into the gut near the anus. 



The urinary bladder was large, and almost round. The teats are 

 almost imperceptible in the male, and even in the unimpregnated female ; 

 but in a gravid specimen I counted eight, four on each side, two on the 

 chest, and two on the belly. 



The female resembles that of the rat and mouse in the situation and 

 shape of the urethra, and of the glands by the side of it. The clitoris, 

 which is perforated by the urethra, projected externally like a tube, 

 about two lines in length, resembling the prepuce of the male; the 

 orifice of the urethra of the female was three hues distant from the 

 vulva. 



The coats of the vagina are thin, and have longitudinal folds on the 

 internal surface. 



The cornua uteri were long ; the ovaria were flat, long and tubercu- 

 lated. The tubes of Fallopius were convoluted in the interval between 



