240 



PROCEEDINGS OF THE ACADEMY OF 



[Apr., 



more series of lamellae, each deeply cleft and therefore distinct, 

 besides each lamella being broken up transversely into as many small 

 apical papillae. Teeth of upper jaw quite different from those in 

 lower, 6 in number, though each rather indistinctly tricuspid median 

 cusp much better defined, and outer tooth of each side a little smaller 

 than subequal inner ones. Lower teeth developed as two long 

 slender upward-curved pointed teeth, and basally though well back 

 on each side another similar, much shorted and inconspicuous tooth, 

 apparently less firm in its socket. INIouth with very broad upper 

 buccal membrane, its surface finely papillose. Tongue not deter- 

 mined. Mandible short, rami not especially high. Anterior nostril 

 lateral, in conspicuous and somewhat bell-shaped cutaneous tube 



Fig. 5. — Leporinus desmotes Fowler. (Type.) 



equal to half of eye-diameter in length, and protruded bej'ond edge 

 of upper lip. Posterior nostril lateral ol^lique slit, formed about 

 last f in snout length about opposite eye centre. Interorbital l)roadly 

 convex. Suborbitals moderate in width. Hind edge of preopercle 

 slopes forward. Opercle moderate, smooth. 



Gill-opening restricted, extends forward only ali(jut last sixth 

 in head. Gill-rakers 8+11 rather short l)road firm points, trifle 

 over ^ in gill-filaments and latter slightly exceeding half an eye- 

 diameter. Isthmus rather broad and convex. Branchiostegals 4, 

 rather broad, moderate, subequal. 



Scales large, well exposed, slightly smaller on breast and predorsal 

 'region, though much more so on caudal base, otherwise uniform. 



