PHILIPPINE MACB.OUROID FISHES GILBERT AND HUBBS. 



527 



46. HYMENOCEPHALUS LONGIPES Smith and Radcliffe. 



Hymenocephalus longipes Smith and Radcliffe, Proc. U. S. Nat. Mus., 

 vol. 43, 1912, p. 109, pi. 23, fig. 1. 



List of stations. 



Albatross 



station. 



Locality. 



fathoms. Xuc 



Number 

 of speci- 

 mens. 



5118 

 5216 

 5222 

 5372 

 5374 

 5387 

 5403 

 5412 

 5417 

 5418 

 5421 

 5502 

 5542 



Off southwestern Luzon 



Between Burias and Luzon 



Between Marinduque and Luzon. 

 Vicinity of Marinduque Island . . . 



do." 



Between Burias and Luzon 



Between Leyte and Cebu 



Between Cebu and Bohol 



do 



do 



Between Panay and Guimaras . . . 



Off northern Mindanao 



do 



159 

 215 

 195 

 150 

 190 

 209 

 182 

 J62 

 1)15 

 159 

 137 

 214 

 200 



54.3 



2 

 Type 



1 

 2 



When the tail is entire, the head is contained six times in the total 

 length; the greatest width of the head is contained twice in its 

 length ; the middle of the length of the head is not at the posterior mar- 

 gin of pupil, being nearer to the posterior rim of the orbit, varying 

 from midway between pupil and hind margin of orbit to the hind 

 margin of the orbit. Preocular length of snout, contained 4.2 (4.0 to 

 4.8 in paratypes) times in length of head to end of membrane at 

 angle of opercle; orbit, 3.35 (2.8 to 3.4) ; interorbital, 5.7,(4.8 to 6.4) ; 

 length of upper jaw, 1.8 (1.75 to 2.0). Branchiostegals, 7. 



The posterior lens-shaped body is about half as wide as the pupil ; 

 its posterior margin is emarginate, as in longiceps; the anterior 

 organ is similar but slightly smaller, and is located, as in all other 

 species, on the mid-ventral line between the ventrals and the isthmus. 

 The region between the pectoral and ventral fins and the anus is not 

 naked, as originally described, but is covered with thin, spineless 

 scales. 



The striation of the belly is extensive, as in H. striatissimus, ita- 

 licus, cavernosu-s, and longiceps. The base of each ventral fin is sur- 

 rounded by this striated area, which extends thence backward nearly 

 to the anus, leaving a median non-striated strip; the region before 

 and below the pectoral bases, the entire sides of the isthmus, and the 

 gular membrane are all striated; the black cross lines on the giilar 

 membranes are not strongly developed. 



(longipes, in reference to the produced ventral fin.) 



47. HYMENOCEPHALUS STRIATISSIMUS Jordan and Gilbert. 



This species was dredged in large series by the Albatross about the 

 Philippine Islands. The large number (472) of specimens available 

 has made possible a detailed study of the material, which has led us 

 119404—20 11 



