Cupe.] 



562 



[Aim. 19, 



Stethapriok erythuops. Cope gen. et sp. nov. 

 Character genericus. Dovsal not elongate, anal prolonged. Premaxillary 

 teeth coanpressetl, loLed, in two rows ; no maxiilaries. Mandibulars 

 lobed, without conic teeth posteriorly. No keel of spines on the ventral 

 region. Branchial fissures extended. 



This new genus displays roost of the characters of Mylesinus Cuv. Val., 

 but is entirely without the exposed ventral spines characteristic of that 

 genus and of Myletes. The trenchant four-lobed molars of the posterior 

 series differ entirely from tliose of Myletes ; the dentition, indeed, is not 

 very different from that of Tetragonopterus. 



Character specifieus. Radii; D. 12 ; A. 40; squam- 

 ation 21 — 61 — 21. Form discoid, abdominal outline 

 more convex than the dorsal, which is irregular. 

 It is convex above the nape, descending along the 

 base of the dorsal fin, convex in front of the adipose, 

 and concave behind it. DeiDth 1.5 times in length 

 without caudal, head 3.66 times in the same. Eye 

 large, not quite equal to the diameter of the moder- 

 ately convex interorbital space, 2.5 times in length 

 of the head. The maxillary is elongate, and extends 

 to the line of the anterior margin of the orbit. The 

 denticulations of the teeth are apical, those of the 

 mandibulars four or five in number. The outer 

 teeth of the anterior premaxillary series small. Ventrals small, below 

 tlie line of origin of the dorsal. Adipose fin small, caudal furcate. Anal 

 fin narrow, not lobed, anterior i-adii moderately elongate. 



