40, GONioxoroi'iiis. 323 



40. GONIONOTOPHIS. 



Gonionotus {non Grai/), Mocquartf, liuU. Soc. Philom. (8) i. 1889, 

 p. 146. 



Maxillary teeth 20, antcM-ior but slightly longer than the others ; 

 anterior mandibular teeth likewise slightly longer. Head scarcely 

 distinct from neck, much depressed ; eye small, with vertically elliptic 

 pupil ; nostril large ; pnioocular present or absent. Body cylindrical ; 

 scales keeled, with apical pits, in 15 or 21 rows, those of the middle 

 row enlarged and bicarinate ; ventrals rounded or obtusely angulate 

 laterally. Tail moderate ; subcaudals in two rows. Hypapo- 

 physes developed throughout the vertebral column. 



Tropical Africa. 



Siinopsis of the Species. 



Scales strongly keeled, in 2 1 rows ; temporals 



2 + 2 1. hrussaiuvi, p. 323. 



Scales strongly keeled, in 21 rows ; temporals 



1 + 2 2. vossii, p. 323. 



Scales feebly keeled, in 15 rows ; temporals 



1+2 3. fjrantii, p. 324. 



1. GonionotopMs brussauxi. 



Gonionotus brussauxi, Mocquard, I. c. p. 146, pi. ii. 



llostral twice as broad as deep, scarcely visible from above ; in- 

 ternasals very short ; frontal as broad as long, as long as its distance 

 from the end of the snout, much shorter than the parietals ; supra- 

 ocular very small ; loreal more than twice as long as deep ; no 

 prteocular, the loreal and the pncfrontal entering the eye ; two 

 postoculars ; temporals 2 + 2 ; eight upper labials, fourth and fifth 

 entering the eye ; five lower labials in contact with the anterior 

 chin-shields, which are longer than the posterior. Scales in 21 

 rows, strongly keeled, the vertebral sharply bicarinate on the 

 posterior half of the body. Ycntrals 170 ; anal single ; subcaudals 

 73. Blackish brown abeve, dirty yellow beneath. 



Total length 440 millim. ; tail 118. 



Loudinia-Xiari, Congo. 



2. GonionotopMs vossii. 

 Gonionotus vossi, lioetty. Zool. Anz. 1892, p 418. 



Closely allied to the preceding, but head shorter, prtefrontals not 

 longer than broad, and temporals 1+2. Scales in 21 rows, the 

 vertebral sharply bicarinate throughout the body. Ventrals 175 ; 

 anal single ; subcaudals 70. 



Total length 454 millim. ; tail 110. 



Cameroons. 



t2 



