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 dasycephalus Jordan, Proc. U. S. Nat. Mus. 1885, 366 



(name only). 

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



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

 Habitat: West Coast tropical America; Sandwich Islands. 



54. Tachisurus longicephalus, 



Tachisurus longicephalus Eigenm. & 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 

 1J 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 1J 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-J- in 

 the head; intermaxillary teeth long and slender, the 

 depth of the band 4J in its width; voiner- 

 ine and palatine teeth obtusely conical, the 

 vomerine patches separate, contiguous to, but 

 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. 



