ro.2149. JAPANESE MACROUROID FWIIES— GILBERT AND IIVBBB. 189 



TahJe of measurements in hundredths of length to anus. 



Albatross station 



Total length, mm 



Length to anus, mm 



Length, head 



Length, orbit 



Width, interorbital 



Width, suDorbital 



Orbit to preopercle 



Length, snout 



Length, maxillary 



Depth, body 



Anus to ventral 



Ventral to gill membrane 



Height, second dorsal spine 



Height, third dorsal ray 



Length, first dorsal base 



Interdorsal space 



Length, first pectoral ray 



Length, second pectoral ray 



Length, third pectoral ray 



Length, outer ventral ray 



Length, second ventral ray 



Gill-rakers, lower limb, second arch. 



4919 

 180+ 

 49.5 

 67 

 23 



50G0 

 1122 



45 



63 



20 



20 

 9 



30 



19 



33 



40 



33.5 



37 



4919 

 1 182 

 50 

 67 

 20 

 20 

 9 

 30 

 22 

 36 

 40 



4919 

 177 

 49 

 65 

 19 

 20 

 8.5 

 29 

 19 

 34 

 43 



1 A small pseudocaudal developed. 



Genus MALACOCEPHALUS Gunther. 



M aZacocephalus differs from Lionurus,, and the other genera of the 

 Coryphaenoidinae with seven branchiostegal rays, in the dentition 

 and in the profuse branching of the numerous pyloric caeca. Teeth 

 biserial in upper jaw; miiserial in lower jaw. 



21. MALACOCEPHALUS NIPPONENSIS, new species. 



Plate 9, fig. 2. 



Type-specimen. — 460 mm. long (a small pseudocauctal developed), 

 from Albatross station 4967, off the east coast of central Hondo, at 

 a depth of 244 to 253 fathoms; Cat. No. 76866, U.S.N.M. 



Comparison of specimens from the Hawaiian Islands, Japan, and 

 the Philippine Islands indicates the presence of three species in the 

 Pacific Ocean, one in each locality mentioned. Although w^e have no 

 specimens of M. laevis, the Atlantic species, it seems unsafe to identify 

 any one of the Pacific species with it, as certain differences appear 

 in the descriptions. The relationships of the species are indicated 

 in the following key : 



a\ Snout short blunt and low, its bony tip on a horizontal through lower edge 

 of pupil ; preoral length of snout 3.7 in postorbital length of head ; dorsal 

 rays II, 10 ; pectoral rays, 16 or 17 ; fins uniformly dusky ; teeth much 



stronger than in other species M. species (Philippine Is.). 



a^ Snout more pointed and higher, the bony tip on a horizontal through upper 

 part of pupil ; preoral length of snout, 2.2 to 2..5 in postorbital length of 

 head. 

 b\ Eye less than two-thirds postorbital length of head ; ventral fins uni- 

 form blacki.sh. 

 c\ Dorsal rays II, 11 or 12; pectoral rays 17 or 18; ventral fossa (before 

 anus) triangular, larger; pectoral more than half as long as head. 



laevis. 



