86 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



tube, prolonged posteriorly. iSTo accessory lateral line; lateral line very 

 nearly straight. Dorsal fiu very long, of more than ninety rays ; scales 

 smooth. Anal with or without a spine; caudal convex on posterior 

 margin. 



The following two species are separated by well-marked characters from 

 each other; but I have not considered it necessary to use a different 

 generic name for G. zacMrus^ in which the anal is preceded by a spine, 

 and the teeth are continued farther on the blind side. 



GLYPTOCEniALUS TACIFICUS Sp. nov. 



D. 99-104. A. 80-87. P. 10-12. V. G. 0. 3-8-8-3. 



Form elongate ellii^soid, dorsal and abdominal outlines curving regu- 

 larly and similarly from head to caudal peduncle, which slightly in- 

 creases in Avidtli posteriorly. Snout continuous with dorsal outline, but 

 ylightly more curved ; lower margin of head straight. Greatest width 

 contained about 3f , head more than 5 times in the total length, or the 

 former about 2t^ and the latter about 4^ times in the length without the 

 caudal. Eyes about \-4- ; snout (measured from tlie lower eye) ^-\ of 

 the length of the head. Anterior nostril on both sides tubular, the tube 

 short, its posterior margin produced into a flaj) ; posterior without flap. 

 Nostrils small; hinder margin of posterior nostril about vertical with the 

 anterior margin of the ui^i^er orbit. Lower eye somewhat in advance of 

 the upper, which reaches the dorsal profile at its anterior extremity. lu- 

 terorbital space a very narrow, smooth, somewhat elevated ridge of bone. 

 Cleft of mouth nearly equal on both sides, very small, oblique ; the max- 

 illary reaching but little beyond a vertical from the anterior margin of 

 the lower eye, and scarce so far as a vertical from that of the upper. 

 Tip of mandible level with the centre of the lower eye, and scarcely pro- 

 jecting in the closed mouth. Lips tolerably w^ell developed. Teeth 

 broad, thin, incisor-like, forming a continuous sharp cutting edge along 

 the blind side of both jaws, but in both ending rather abruptly before 

 reaching the colored side. Twelve teeth in the lower and nine or ten in 

 the upper jaw; those at the anterior commencement of the row slightly 

 smaller than the others. Upper pharyngeal bones with 5-9 sharp coni- 

 cal teeth on each, the anterior with the greatest number; lower pharyn- 

 geal teeth in two rows, sharp, conical, those of the inner row larger than 

 those of the outer, except in front, where there are a few larger teeth; 

 equal in size in both rows. Gill-rakers short, slender, flexible, lanceo- 

 late. Dorsal and anal long and low, similar, coterminous, fleshy at base ; 

 the rays simple, their tips free. Dorsal commencing opposite the centre 

 of the pupil of the upper eye, the longest rays a little behind the centre 

 of the length of the fin, and about ^ of the width of the body in length. 

 5^0 spine before anal, the first ray of which is only a little i)osterior to 

 the hinder pectoral axil, and its longest rays opposite and equal to those 

 of the dorsal. Distance from the end of the dorsal and anal fins to the 

 caudal equal to about half the depth of the caudal peduncle. Caudal 

 w^ith three or four accessory rays on each side, not very wide; posterior 



