250 PROCEEDINGS OF THE ACADEMY OF [April, 



times the lengtli of the animal, which is not tlie case in any of the 

 fii-st three animals examined. The total length of the alimentary 

 canal in Owen's specimen, not counting the oesophagus and stomach, 

 exceeds so much that of the other three as to give the impression 

 that possibly Owen's figures are erroneous, due, possibly, to a typo- 

 graphical error or otherwise. The difference in the length of the 

 crecum in the four specimens is very noticeable, that of Leche's 

 specimen being nearly three times as long as that of Owen's, and 

 those of the Sumatra and Borneo specimens seven and nine times 

 as long respectively. The capacity of the csecum has been stated 

 as being equal to that of the stomach. While such was no doubt 

 the case in Leche's specimen, in both the Sumatra and Borneo 

 specimens the capacity of the csecum was greater than that of the 

 stomach. In the case of two lemurs recently dissected by the 

 author, with the view of comparing the structure of the lemur with 

 that of Galeopitheeus, in one. Lemur albifrons, measuring from the 

 snout to the root of the taU 38.7 cent. (15.5 in.), the caecum 

 measured 17.5 mm. (7 in.) and in the other, Loris tardigradus, 

 37.5 cent. (15 in.) long, the csecmn measured 5 cent. (2 in.). 

 The liver is divided into two halves, the right half being the 

 largest, and subdivided into three lobes. The gall-bladder is small 

 and elongated. The ductus choledochus enters the small intestine 

 50 mm. (2 in.) from the pyloric orifice. The pancreas lying in 

 the mesentery is flattened and much bx-anched. Its duct enters the 

 intestine 20 mm. (i in.) from the orifice of the choledochus. The 

 spleen attached 1o the cardiac part of the stomach by the gastro- 

 splenic ligament is triangular in form and presents at the anterior 

 part of its median surface a small but well-defined process. 



Kespiratory and Circulatory Organs. 



PLATE X. 



The posterior uares are narrow. The larynx does not present 

 anything of especial interest. The trachea was 100 mm. (4 in.) 

 long, and its rings were complete. The lungs are undi\dded ; the 

 right limg is slightly larger than the left. There are three vena 

 cavse, two superior and one inferior. The left superior cava 

 passing behind the heart to empty into the right auricle. A simi- 

 lar disposition obtains also in certain Insectivora and Chiroptera, 

 but not in Lenuiroidea there being but one superior vena cava in 



