RODENTIA. ] 97 



bladder is attached to the second from the left, lying in a sulcus, with 

 its fundus in a fissure at the edge of the liver, so as to appear a convex 

 surface, as if in a hole. The stomach is as common. The caecum is 

 similar to that of the opossum : the colon is short. The clitoris is long 

 and grooved, leading into the vagina. There are two horns to the 

 uterus, but they are short. There is a capsula ovarii. There were found 

 in the stomach a great many wings of butterflies, and skins of other 

 insects. 



[Order Rodentia.] 

 The Chisel-Tooth, SCALPRIS BENT AT A. 



The following class of animals probably ought to be called an order, 

 of which there are several genera, and a still greater number of species. 



Genus. Species. 



C Hare, common. 

 Hare \ „ Norway. 



[Pab 



Rabbit 1 . 



Guinea Pig . . 

 Porcupine .... 

 Squirrel .... 



Of the SCALPRIS DENT AT A. 



I do not know if there be any permanent character of this order, so 

 as at once to distinguish it from all other orders. The head has through 

 the whole order a similarity, which probably is owing to their having 

 a peculiar set of teeth, and which perhaps becomes the only charac- 

 teristic mark. 



The external parts of generation also have a similarity through the 

 whole ; but form not so uniform a mark as the head and teeth ; but 

 these are marks which require a nicer investigation, and therefore 

 should be put down as only secondary characters. In external form 

 they vary very much, as also in their extremities and appendices. 

 Some have legs of various lengths, the fore-legs much shorter than the 

 hind ones : some have a very long tail, others a very short one, or none : 

 the ears are long in some, short in others : the hair is very fine in some, 



1 [For the number of species now known in this family (Leporidce), see Mr. Water- 

 house's ' Natural History of the Rodentia,' 8vo, 1846.] 



