10. TYPHLONECTES. 103 



Snout broad, rounded ; eyes distinct ; tentacle close to the nostril. 

 Body stout, moderately elongate, becoming gradually compressed 

 and keeled above towards the end ; 135 to 167 circular folds, inter- 

 rupted on the back. Tail indistinct. Olive-brown. Total length 

 470 millim. ; diameter of body 20 millim. 



Guianas ; Venezuela. 



2. Typhlonectes dorsalis. 



Coecilia dorsalis, Peters, Mon. Berl. Ac. 1877, p. 459, pi. — . 

 Typhlonectes dorsalis, Peters, eod. loc. 1879, p. 941. 



Snout rounded, very prominent ; eyes distinct ; tentacle behind 

 and below the nostril, twice as far from the eye as from the latter. 

 Body rather slender, elongate ; a raised line on the hinder part of 

 the back, continued on the distinct, compressed, rudiment of tail ; 

 circular folds 99, all complete ; anal disk very distinct. Yellowish 

 brownish olive, theannuli black. Total length 265 millim. ; diameter 

 of body 7 millim. 



Angostura, Venezuela. 



3. Typhlonectes natans. (Plate IX. fig. 3.) 



Coecilia natans, Fischer, Mon. Berl. Ac. 1879, p. 941, and Arch. f. 



Nat. 1880, p. 217, pi. \iii. f. 5-7. 

 Typhlonectes natans, Peters, Mon. Berl. Ac. 1879, p. 941. 



Inner row of mandibular teeth composed of 12 to 14 teeth. 

 Snout very prominent; eyes distinct; tentacle behind and slightly 

 below the nostril, three times nearer the latter than the eye. Body 

 moderately elongate, strongly compressed posteriorly, with a more 

 or less distinct prominent ridge on the posterior part of the back ; 

 skin granulate; circular folds very indistinct. Tail distinct. 

 Brownish grey, a little lighter beneath ; anal disk white. Total 

 length 360 millim. ; greatest diameter of body about 10 millim. 



Cacera, Colombia. 



a. Adult. Berlin Museum [E.]. 



The following species is referred, with doubt, by Prof. Peters to 

 this genus ; but nothing in Mr. Cope's description would seem to 

 indicate the correctness of that view : — 



Siphonops syntremtts, Cope, Proc. Ac. Pliilad. 1866, p. 129. 



" This species differs from the four hitherto known (S. indi- 

 stinctus, B,. & L., annulatus, Mik., brasiliensis, Liitk., mexicanus, 

 D. & B.) in the close approximation of the narial and tentacular 

 openings ; the latter lie behind the former, and are slightly larger. 

 The minute eyes are just visible ; the internal nares are some dis- 

 tance behind the palatine arch. Muzzle projecting, obtuse in pro- 

 file ; from above narrowed, rounded. Teeth large, five on each 

 ramus mandibuli. A gular and strong postgular fold ; 130 annular 

 plicae, which are complete, except slight ventral interruption ante- 



