82 CALIFORNIA ACADEMY OF SCIENCES. 



Ichthyol. Beitr. iv, 26 (Panama); Jordan & Gilbert, Bull. U. S. 



Fish Comm. 1882, 51 (Panama); Jordan, Proc. U. S. Nat. Mus. 



1882, 622 (Panama). 

 Galeichthys dasycejyhalus Jordan, Proc. U. S. Nat. Mus. 1885, 366 



(name only). 

 Tachisurus dasycephalus Eigenm. & Eigeum. Proc. Cal. Acad. 2d 



Ser. vol. i, 1888, 143 (name only). 

 Habitat: West Coast tropical America; Sandwich Islands. 



54. Tachisurus longicephalus. 



Tarh'ufurus loiigicrphalus Eigeum. & Eigenm. Proc. Cal. Acad. 2d 

 Ser. vol. i, 1888, 143 (Panama). 



Elongate, slender; greatest width little greater than 

 the depth. Head long and depressed, its greatest width 

 1^ in its length, its greatest depth little more than half 

 its length. Top of head with faint granules almost en- 

 tirely concealed by the skin; interorbital area flat and 

 with four ridges which are obscurely granular, the in- 

 ner two bordering the fontanel, the outer ones curved 

 in front extending obliquely backward from near the 

 posterior nasal opening; occipital process as long as 

 broad, its margins concave; fontanel produced as a deep 

 groove to the base of occipital process; opercle faintly 

 striate; humeral process entirely covered with thick skin, 

 not granular. 



Eye lateral, well above the angle of the mouth, its 

 diameter li in snout, 6 in head, 3 in interocular; snout 

 depressed and rounded in front. 



Maxillary barbels extending scarcely beyond base of 

 pectorals, mentals not to gill opening. 



Upper jaw little projecting; width of the mouth 2| in 

 the head; intermaxillary teeth long and slender, the 



depth of the band 4i in its width; vomer- ^ 



ine and palatine teeth obtusely conical, the ^^■~:::^::^C^^::;^ 

 vomerine patches separate, contiguous to, but O^ ^O 

 not confluent with the palatine patches. ^^' 



Gill-membranes not forming an angle where they meet, 

 with a rather broad free margin. Gill-rakers short and 

 thick, 4+5. 



