3. RniNonATUS. 



445 



than the distance between the inner angles of the nostrils, but much 

 less than the length of the mouth, -which is nearly straight. Snout 

 rather produced, the distance between the outer angles of the 

 nostrils being two-thirds of that between the mouth and the end 



/'"N, 



/ 



\ 



of the snout. Back nearly smooth, with a series of small, i)olislied, 

 depressed spines along the median line. Similar spines on the orbital 

 margin and on the shoulder. The two rostral ridges are narrow 

 and separated by a very broad groove in their entire length. Snout 

 white, as iisual. 



Pacific Coast of Central America. 

 a. Type of the species. Presented by Capt. Dow. 



7. Rliinobatus bougainvillii. 

 Ivhinobatus (Sjrrhina) bougainvillii, M\iU. c^- Hmic, p. 117 ; Dumi-ril, 

 Elasmohr. p. 4'Jl, pi. 10. fig. 1 (mouth). 



The anterior nasal valve is not continued across the internasal 

 space, but extends to the inner angle of the nostril. Snout rather 

 produced. Mouth strongly arched, the median teeth being smaller 

 than the lateral. Skin nearly smooth, with a series of samll tuber- 

 cles along the middle of the back. 



JIah. ? 



Khinol)atiis sclilc 



^ Rhinobatus schlegelii. 



I Hi, Mull. (V HcuU, p. ^2.^. pi. -12 : liichard-^. Irhth. 



