502 



and comprehensive. See Trans. Zool. Soc, 1867, vi, p. 125, et 

 seq. Having been unable to examine the skull considered by- 

 Prof, Wyman it is impossible to give the differences between it 

 and those in hand, but these latter certainly do not answer to any 

 description of C. acutus, which at first I supposed them to be. 



The following is Dr. Gray's description of G. acutus, and of the 

 genus which he calls 



"Molinia. — Face elongate ; forehead swollen, convex, especially 

 in the adult ; orbits without any anterior ridge. Nuchal plates 

 two or four, small. Cervical disc rhombic, of six plates, side 

 plates generally small. The legs fringed with a series of trian- 

 gular, elongate scales. Toes webbed. Scales of the forearm and 

 thigh thin, -smooth." 



i: m. ^ ■ : : : . ..... 



a long ridge ; the internal nostril posterior with an oblong sloping 



< ; - . . .\::!ar\ - . : 



of the maxillae" 



"M. Americana.— Face slender, dorsal plates irregular; the 

 central series small, keeled ; lateral scattered, strongly keeled. 

 Nasal bones produced to the nostrils." 



It is necessary to give the characteristics of the genus since a 

 very few points are sufficient to distinguish the species of Molinia 

 of which there are only two. I shall now describe specimens of 

 uhh-h there is a series of six, varying from fourteen and onedialf 



inches to fourteen feet in length. The description refers to the 

 o<l nit specimens, of which we have three. 



anterior ridge. Nuchal plates four, small ; three small keeled 

 scales on each side of the neck between nuchal and cervical plates, 



