158 MR. R. I. POCOCK ON A [Mar. 3, 



CoraUus. As will be observed in the figure of the lung of CoraUus 

 canimts, the heaclvvard running pocket of the lungs occupies a 

 different position in the two lungs. In the case of the larger 

 lung it will be seen that the anterior process of the lung in 

 question is partly roofed by the interannular membrane of the 

 trachea as well as by the bronchial semirings. On the other 

 hand, the same anterior process of the shorter lung has no rela- 

 tion whatever to the interannular tracheal membrane. I do not 

 know how far this is to be seen in other two-lunged snakes 

 (Boidfe). I hope to look into this matter further, since it has an 

 obvious bearing upon the degree of degeneration of the smaller 

 lung, and therefore upon the phylogeny of the group. 



The following brief statement of the anatomical characters of 

 the species will serve for a compaiison with the corresponding- 

 definitions of C. viadagascariensis and C. cookii upon p. 151. 



CoraUus caninus. 



Alental groove bordered by 15 scales on each side. Bronchus 

 continued only for a short distance into interior of larger lung ; 

 its rings become irregidarand interrupted by orifices into lung- 

 tissue. Intercostal arteries like those ofC cookii. A riidiment of 

 umbilical vein 2:>ersists. Liver %mth long posterior p>'rolongation of 

 hepatic substance. Gall-bladder rather near to end of liver. 

 Pancreas tuith no prolongatio')i to splee7i. 



The agreement with CoraUus cookii is obviously much closer 

 than with C niadagascariensis. 



3. Description of a new Species of Monkey of the Genns 

 CercopitJiecus. By R. I. Pocock, F.L.S., Superintendent 

 of the Gardens.* 



[Received February 18, 1908.] 



(Plate X.t) 



The Zoological Society has recently acquired by purchase from 

 Mr. F. C. Thorpe, of Hull, a young example of a species of Cerco- 

 jnthecus quite different from aiiy form hitherto described. At. 

 Mr. Thorpe's special request I dedicate this new species to 

 Mr. Ezra, of Calcutta. 



Cercopithecus ezr.« Pocock. 



Abstr. P. Z. S. 1908, p. 10 (March 3). 



Skin of upper part of face black ; that of the lips and chin blue, 

 clothed with white hairs. Head ornamented in front with a 



* [The complete account of the new species described in this communication 

 appears here ; but as the name and the preliminarj' diagnosis were published in tlie 

 ' Abstract,' the species is distinguished by the name being underlined. — Editoe.] 



t For description of the Plate, see p. 160. 



