248 MARSUPIALIA. 



right lobes are small, the third from the right side is by much the 

 largest, and is rather more in the right hypochondrium than in the left : 

 it is divided into three by two fissures ; in one lies the gall-bladder, in 

 the other is the round ligament. The lobulus Spigelii is partly before 

 the mesogaster and partly behind, as in other squirrels. 



The spleen is a thin long body, and its attachment is very loose. The 

 kidneys are conglobate ; the right lies close to the liver, but the left 

 lies very low, as in the rat. The capsula renalis is as in the rat. The 

 tunica vaginalis testis does not pass out close to the pelvis, but half-way 

 between the pubis and the navel, so that the testicles lie upon the 

 abdomen. This situation obliges that part of the penis which is behind 

 to be so much the longer ; as it would seem necessary that the penis 

 should be before the testicle \ The testes are half out of the abdomen, 

 and half in ; they can be just pushed entirely out and brought wholly 

 in. "When brought within the abdomen, the cremaster muscle is spread 

 upon the tunica vaginalis as in the rat. The penis has a bone in its 

 end which is beyond the anterior bend. 



The parts of generation are the same as in other squirrels, having the 

 glandular bodies on the sides of the anus. Also the contents of the 

 thorax (see description of the English and Virginia squirrels). 



The eye is very large and prominent in proportion to the size of the 

 animal : the cornea is veiy broad, the crystalline humour almost round, 

 and the nigrum pigrnentum of a dark brown colour 2 . 



[Subclass Lyencephala. 



Order Marsupialia.] 



Of Animals from New Holland. 



General Observations. 



It is much to be wished that those gentlemen who are desirous of 

 obliging their friends, and promoting the study of Natural History, by 

 sending home specimens, would endeavour to procure all the informa- 

 tion they can relating to such things as they may collect, more especially 

 animals. The things themselves may be valuable, and may in some 

 degree partly explain their connexion with those related to them, so as 

 in some measure to establish their place in Nature ; but they cannot 

 do it entirely ; they only give us the form and construction, but leave 



1 [This is not the case in the Marsupialia.] 2 [Hunt, Preps. Nos. 1707, 1708.] 



