PHILIPPINE MACROUROID FISHES GILBERT AND HUBBS. 



539 



Papyrocephalus, new subgenus. 



Type-species. — Hymenocephdlus aterrvrntm Gilbert. 



Three species of Hymenocephdlus differs so widely from all others 

 in certain characters that we have erected for them this new sub- 

 genus., Papyrocephalus. These species are II. aterrimus Gilbert * 

 (Hawaiian), //. papyraceus Jordan and Gilbert 2 (Japanese), and 

 II. barbatulus, new (Philippine). They are mutually character- 

 ized by their deep, sharply compressed bodies; by the excessive de- 

 velopment of the shallow sensory canals of the head; by having 

 the bony septa even much thinner and weaker than in typical 

 Hymenocephdlus; by the great width of the suborbital and pre- 

 cpercle; by the small eye; and by the blackish color, they being 

 without the silvery sides characteristic of all other known forms. 



53. HYMENOCEPHALUS BARBATULUS, new species. 



Type -spin men.— Cat, No. 83652 U.S.N.M., 98 mm. long to end of 

 tail, which is broken at its extreme tip, 27 mm. to anus; dredged 

 with the single paratype 57 mm. long at Albatross station 5238, in 



W& 





M 



Fig. 34. — Hymenocephalus barbatolus. Type. 



the Pacific Ocean, off the eastern coast of Mindanao; 380 fathoms; 

 bottom temperature, 43.0° F. 



Fin-rays — first dorsal, II, 8; pectorals, about 10; ventrals, 7 

 (11 in papyraceus, 13 or 11 in aterrimus). 



The body is deep and compressed, tapering rather abruptly into 

 the usual whip-like tail; greatest depth of body, 1.1 in length of 

 head; greatest width of head, about equal to postorbital length of 

 head. The head is bluntly rounded anteriorly, its lateral contours 

 are subparallel. The length of the blunt snout is greater than that 

 of the orbit, is nearly equal to the interorbital width, and is con- 

 tained 3.3 times in the length of head. The orbit is small, being 



1 Gilbert, Bull U. S. Fish Comm., 1903 (1905), sec. 2, p. 666, pi. 93. 



2 Jordan and Gilbert, Bull. U. S. Pish. Comm., 1902 (1904), p. 614, text figure. 



