1905.] NATURAL SCIENCES OF PHILADELPHIA. 487 



CHELIN.E. 

 42. Macroohiriclithys snyderi sp. nov. 



Head 4f ; depth, at lower base of pectoral, .5^ ; at middle of trunk 5f ; 

 D. Ill, 7; A. Ill, 25, i; P. ii, 14; V. ii, 7; scales about 96 in lateral line 

 to base of caudal and several more on latter ; about 18 scales in a verti- 

 cal series between origin of dorsal and lateral line; 11 scales in a verti- 

 cal series between lateral line and origin of anal; about 150? scales 

 before dorsal; width of head 3^ in its length; depth of head, opposite 

 middle of orbit, 1|; mandible If; length of depressed dorsal l^-^; 

 least depth of caudal peduncle 3j^; length of depressed ventral 2; 

 snout 3| in head, from its own tip; eye 4^; mouth 2^; interorbital 

 space 4^ ; length of pectoral 3f in body without caudal ; base of anal 5^. 



Body strongly compressed, upper profile evenly though slightly 

 convex from neck to caudal, and lower not so much so though sharply 



Fig. 7. — Macrochirichthys snyderi Fowler. 



trenchant. Greatest depth of trunk near root of ventral Chest tren- 

 chant and produced below abdomen at lower root of ventral. Least 

 depth of caudal peduncle about equal to its length. 



Head well compressed, trenchant above and below, and directed up- 

 ward. Upper profile nearly straight from tip of snout to nape, and 

 sloping obliquely down posteriorly. Snout obliquely vertical. Upper 

 jaw forms a sliglit protuberance above. Eye circular, anterior and 

 rather high in head. Infraorbital (here preorbital in position) narrow, 

 and about f of pupil. Mouth vertical, gape reaching down till opposite 

 lower margin of orbit. Taps thin. Mandible convex in profile, ante- 

 rior to upper jaw. Jaws edentulous, trenchant, mandible with a large 

 bluntish tooth-like process at symphysis, fitting in cavity of upper jaw. 

 Tongue not free from floor of mouth. Nostrils above eye near its 

 margin. Interorl)ital space elevated and trenchant, narrow. 



Gill-opening extending forward nearly opposite front rim of preorbi- 



