REPORT ON THE DEEP-SEA FISHES. • 107 



The pectoral fin has a broad base, is elongate, with rounded posterior margin, and as 

 long as the head without snout. The five detached rays are somewhat stronger than the 

 other rays ; they form at the base one continuous series with the remainder of the fin, and 

 therefore do not seem to possess a separate action. The uppermost ray is the longest, not 

 quite twice as long as the fin, the others gradually decreasing in length. The ventral 

 fins are very feeble simple filaments, only half as long as the pectoral, somewhat distant 

 from each other, and inserted opposite to the hind margin of the praeoperculum. 



The scales are small, thin, smooth, adherent. The lateral line is a continuous tract, 

 not covered by scales, running parallel to, and close to, the dorsal profile, and disappearing 

 in the posterior third of the tail ; it is separated from the dorsal fin by about six 

 series of scales. 



The colour was probably pink, with black vertical fins ; cavity of the mouth and gills 

 black. 



Habitat. — Japan, Station 235; depth, 565 fathoms. One specimen, 14|^ inches long. 



Dicrolene. 

 Dicrolene, Goode and Bean, Bull. Miis. Comp. ZoiJL, vol. x., 1883, p. 202. 



The lower pectoral rays are separate and much produced. Body elongate, moderately 

 compressed, covered with small scales. Lateral line incomplete, close to the dorsal 

 profile. Head somewhat comjiressed, covered with scales. Eye large. A small separate 

 caudal fin much prolonged. Ventral fins close together, each composed of a single bifid 

 ray. Snout short ; jaws nearly equal in front ; barbel none. Mouth and dentition as 

 in Pteroidonus. Operculum with a straight spine. Seven branchiostegals. Gill-laminae 

 of moderate length ; gill-rakers rather long, not numerous ; pseudobranchiaj none. 

 Pyloric caeca few, rudimentary. 



One species is known. 



Dicrolene intronigra. 



Dicrolene introniger, Goode and Bean, loe. cit. 

 B. 7. D. 100. A. ca. 85. C. G or 7. V. 1 | 1. P. 19 | 7-8. L. transv. ca. 27 (above vent). 



Head with supraorbital spines ; several strong spines on the prseoperculum. Eye 

 one-fourth as long as the head and as wide as the interorbital space. Upper detached 

 pectoral ray one-third of the length of the body, and about thrice as long as the fin. 



Habitat. — Several specimens (the size is not stated) were obtained by the U.S. 

 steamer " Blake"; in lat. 33° 40' N., long. 76° 0' W.; in 464 and 647 fathoms. 



