NEW FISHES 211 



MEASUREMENTS OF THE TYPE OF EleotrJS tubulariS. 



COTYLOPUS COCOENSIS sp. nov. 



Pl. XI. 



Type. Cat. No. 6347, Leland Stanford Jr. University Museum. 

 Cocos Island. 



Diagnosis. Scales cycloid, large, fifty-six in a line from opercle 

 to end of the vertebrae ; head, throat, disc and fins naked ; teeth of 

 upper jaw tricuspid, those of mandible equal and separated; eye 

 small, six times in head ; lips without emarginations ; pectorals 

 short. 



Description of the Type. Head four and one fifth in length, 

 depth four and four fifths ; eye six in the head, maxillary two ; inter- 

 orbital two and one half; D. VI-I, 10; A. I, 10; scales 56. 



Body subcylindrical anteriorly, becoming posteriorly more com- 

 pressed; dorsal and ventral outlines nearly parallel. Head high and 

 bluntly rounded anteriorly ; snout broad and flat, obtusely rounded ; 

 interorbital region slightly concave. Nape with a median depression 

 or groove extending from the occiput to dorsal fin. Mouth wide, in- 

 ferior; lips with even margins, lower with two broad posteriorly 

 situated papillae on gums. Teeth of upper jaw in a single series, 

 numerous, slender and brush-like ; tip bent at right angles ; cutting 

 edges tricuspid or trident-shaped; but soon becoming worn down 

 even. Teeth of mandible subequal, well separated ; five on each 

 side of jaw, anterior pair slightly smaller than posterior. Eye small, 

 contained six times in length of head, one and three fourths times 

 in interorbital width. Maxillary extending to vertical from posterior 

 border of eye. 



