PHILIPPINE MACROUROID FISHES—GILBERT AND HUBBS. 535 
51. HYMENOCEPHALUS GRIMALDII Weber. 
Hymenocephalus grimaldii Wrsrer, Fische der Siboga-Expedition, 1913, 
p. 169, pl. 1, fig. 1. 
This species seems to be a close ally of 1. striatissimus, from which 
it differs in several characters: the eye is smaller, less than one-third 
length of head, and less than the interorbital width, which is wider, 
being two-fifths length of the head; the barbel is absent; there are 
only 10 pectoral rays. 
These measurements and counts are taken from Weber’s work, 
since the Albatross failed to obtain this species. 
52. HYMENOCEPHALUS NASCENS, new species. 
Hymenocephalus lethonemus WrsEr, Fische der Siboga-Expedition, 1913, 
p. 167 (not of Jordan and Gilbert). 
Type-specimen.—Cat. No. 78229, U.S.N.M., 143 mm. long to end 
of pseudocaudal, 47 mm. to anus; dredged at Albatross station 5587; 
depth, 415 fathoms; bottom temperature, 42.3° F, 
The large number of specimens of the /ethonemus type in the col- 
lection from the Philippine and East Indian Islands has made pos- 
sible a very close comparison of them with typical H. lethonemus 
from Japan.’ A single difference has been disclosed; namely, an in- 
creased average number of ventral rays. We regard nascens as a 
species rather than as a subspecies because there is no evidence at 
hand of the intergradation of the two forms. The number of ventral 
rays is summarized in the following table: 
Number of ventral rays in Hymenocephalus lethonemus from Japan and in H. 
nascens from the Philippine and East Indian Islands. 
FETS EPONA TVRs tee Bee es SS eee ee ee Se LO AOCUROS eeracoae asedas | 38 Ce eee 
ETRE TSCEIUS SIN NSE yee oe a ere ta PE Naw Ae ae a SERS ce Ee Re eh | 9 103 2 
The type-specimens of //. /ethonemus also have 11 ventral rays; 
Weber gives 12 or 13 as the number of rays in the specimen of 
nascens which he referred to /ethonemus. Most of the 9 fins of nas- 
cens with 11 rays are paired by a ventral with 12 rays. 
1 Jordan and Gilbert, Bull. U. S. Fish Comm., 1902 (1904), p. 615, text figure; Gilbert 
and Hubbs, Proc. U. S. Nat. Mus., vol. 51. 1916, p. 188. 
