DISCUSSION OP SPECIES AND THEIR DISTRIBUTION. 



337 



iostes'als; no psevidobranchi.'c. Small, deciduous scales on body and head; lateral lines 

 indistiiiguisliablc. Vertical Has coutluciit; i)ectorals entire; ventrals widely separated, 

 each (consisting of two tilaments. 



This genus is kuown from a single species taken iu the Bay of Bengal, off th(5 Madras 

 coast ill 1,310 fathoms,— T. Hcxtii, Alcock (Ann. aud Mag. Nat. Hist., 1890, vi, lil3., pi, viii, 

 fig. 1) from Investigator station 97. 



PTEROIDONUS, Gunther. 



rteroidonus, Gunther, Challenger Report, xxii, 1887, 106. 



The lower pectoral rays arc incompletely united with the upper part of the fln and are 

 prolonged. Body elongate, compressed, covered with small .scales; lateral line incom- 

 plete, close to the dorsal profile. Head oblong, thick, covered with scales. Eye small. 

 Vertical fins united, but the narrow caudal projecting beyond the short anal and dorsal 

 rays. Ventrals reduced ti) a simple filament, inserted behind the humeral symphysis, and 

 somewhat distant from each other. Snout broad with rounded profile, including the lower 

 jaw, without barbel. Mouth wide; bands of villiforni teeth in the jaws, on the vomer, and 

 palatine bones. Operculum with a straight spine; preoperculum armed. Eight branch- 

 iostegals. Gill-laminai rather short; gill-vakers rather long, lanceolate and widely set; 

 pseudobranchife none. {Giinther.) 



PTEROIDONUS QUINQUARIUS. 



This genus is represented by a single specimen, of a species called by Giinther, Pteroi- 



doniis quhKiaiirlus {loc. cit), PL xxii. Fig. B, l-li inches long, obtained by the Challenger 

 off the coast of Japan (station 235), at the depth of 5G5 fathoms. 



DICROLENE, Goode aud Bkan. 

 Dicrolene, Goodr and Beax, Bull Mas. Comi). Zoijl., X, 202.— GOntuer, Challenger Report, xxii, 1887, 107 



Brotulids with body moderately compressed; head somewhat compressed, witli mouth 

 large (in the type species extending nearly to tlie posterior margin of the eye). Tiie tip of 

 the maxillary much dilated. Eye large, x)laced close to the dorsal profile. Head with supra- 

 orl)ital spines; several strong spines on the preoperculum, and one long spine at the upper 

 angle of (lie operculum. Snout short, not projecting beyond the upper jaw. Jaws nearly 

 equal in front. Teeth in narrow villiform bauds in the jaws, on the head of the vomer, and 

 on the palatines. Barbel none. Gill-openings wide; membranes not united. Gills four; 

 gill laminie of moderate length. Gill-rakers rather long, not numerous. PscudobranchiiB 

 absent. Caudal not confluent, but without a distinct peduncle. Dorsal and anal fins long. 

 Pectoral rays arranged in two groups, several of the lower ones being separate and 

 much produced. Ventral fins close together on the isthmus, a pair of bifid rays. Branch- 

 iostegals eight. Body and head cov'ered with small scales. Lateral line close to the base 

 of the dorsal fln, apparently becoming obsolete on the posterior third of the body. Stomach 

 siphoual. Pyloric cseca few, rudimentary. Intestine shorter than body. 



FaradicroleHc, Alcock (Ann. and Mag. Nat. Hist., 1889, 387), is so close to Dicrolene that 

 we are unable to distinguish it. It is represented by a single species, J), multijilin (Alcock), 

 loc. cit., from the Bay of Bengal, 193 fathoms, lat. 20° 17' 30" N., Ion. 88° 50' E., and from 

 the Andaman Sea, east of Port Blaii-, 271 fathoms, and off the Coromandcl coast. 

 198(58— No. 2 22 



