292 DEEP SEA FISHES. 



Temperature. Bottom. 



38.5° F. Gil. S. 



36.8° F. Gn. M. 



The formulas given below will serve to indicate the closeness of the rela- 

 tionships of the seven species belonging to the genus Alepocephalus known 

 from off the North American coasts. 



A. asperifrons B. 6, D. 17, A. 19, V. 7, P. 11, Scales 8-56 to 58-16. 



A. Bairdii B. 6, D. 22, A. 25, V. 10, P. 12, " 7-65-11. 



A. prodiictus D. 17, A. 17, " 9-67-12. 



A. Agasskii D. 15, A. 17, V. 6, P. 11, •' 10-90-11. 



A./undubis B. 7, D. 16, A. 17, V. 6, P. 11, " 10-90-18. 



A. convexifrons B. 6, D. 18, A. 19, V. 7, P. 11, " 12-90-17. 



A. tenebrosus D. 17, A. 17, P. 10, " 16-90-16. 



Alepoceplialus convexifrons sp. n. 

 Plate LIX. fill. 2. 



Br. r. 6 ; D. 18 ; A. 19 ; V. 7 ; P. 11 ; LI. 90, ca. ; Ltr. 12 + 1 + 17. 



A stouter and less elongate form than A.finiduhis, more slender in the 

 caudal region, more curved on the top of the head, and with much less 

 depression at the back of the crown. Head about two sevenths of the entire 

 length, without a longitudinal groove on the top, profile convex from snout 

 to nape. Snout medium, little longer than the eye, narrow between the 

 nostrils, concave in front of the eye, broadened about the mouth, blunted at 

 the end. Mouth wide ; maxillary much broadened and rounded posteriorly 

 reaching almost or quite to a vertical through the middle of the eye. Teeth 

 small, in a single series on intermaxillaries, palatines, and dentaries. Vom- 

 erine teeth undetermined. Gills four; lamell;\3 short, narrow; rakers seven 

 plus fifteen, longest less than half as long as the eye. Pseudobranchiae well 

 developed. Opercles broad, thin, membranous toward the margins. Gill 

 openings wide ; membranes not united, free from the isthmus. Twelve 

 pyloric cajca. 



Dorsal origin two and one fourth lengths of the head from the end of the 

 snout, above the vent; length of base three fourths of its distance from the 

 median rays of the caudal. Anal origin below the third or the fourth ray of 

 the dorsal ; base reaching six or seven rays backward of that of the dorsal. 

 Caudal pedicel moderately slender. 



