1913.] 



NATURAL SCIENCES OF PHILADELPHIA. 



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sides but slightly constricted below. Snout convex in profile and 

 over surface, length about | its width. Eye large, round, a little 

 high, centre falls about first f in head. Pupil rather large. Eyelids 

 free, not adipose-like. Mouth terminal, broad, commissure short. 

 Lips fleshy, upper firm, lower thick and more free, Maxillary well 

 inclined, rather long or reaches beyond front eye edge nearly to that 

 of pupil, and well exposed. Upper teeth biserial, 8 teeth in each 

 series, those in inner series largest, and all quindentate. No maxil- 

 lary teeth. Mandibular teeth uniserial, quindentate, largest at 

 symphysis, and 8 enlarged ones in front of jaw. Along sides of 



Fig. 11. — Mcenkhausia lepidura madeirce Fowler. (Type.) 



rami a single series of small conic simple uniform teeth, all much 

 lower than anterior ones. Inner buccal folds broad, especially upper. 

 Tongue broad, depressed, rounded and free in front. Mandible 

 strong, slightly protrudes, and rather shallow, rami of about even 

 and moderate elevation inside mouth. Nostrils together, placed 

 close before eye, behind middle in snout length, anterior simple pore 

 and posterior exposed in larger crescent. Interorbital rather broadly 

 convex. Preorbital narrow. Infraorbital broad and not entirely 

 covering cheek, but leaving very narrow naked strip along ridge of 

 preopercle. Hind preopercle edge vertical. Opercle deep and, 

 like suborbitals, smooth. Fontanel on top of head large, broad, 

 extends from front interorbital region back till within occipital 

 process. Latter extends | of space to dorsal origin. 



Gill-opening extends forward about opposite front edge of pupil. 



