DISCUSSION OF fJPECIES AND THEIR DISTRIIiUTION. 



337 



iostegals; no pseudobi-auchiu". Small, deeiduou.s scales on body and head; lateral lines 

 indistinguishable. Vertical lius couHufnt; pectorals entire; veutrals widely separated, 

 each consisting of two filaments. 



Thisgeuus is known from a single species taken in the Day of l>engal, otf tlic Madras 



ast in 1,310 fathoms, — T. Hex'tii, Alcoek (Ann. and Mag. Nat. Hist., 1800, VI, lil3., pi. vili, 



'. 1) from Incestigator station 97. 



(•oast 

 fig. 1) 



PTEROIDONUS, Gunther. 



Pteroidonus, Guntoer, Challenger Report, xxii, 1887, 106. 



The lower pectoral rays arc incompletely united with the npper part of the fin and are 

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

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

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

 rays. Ventrals reduced to 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 villiform teeth in the jaws, on the vomei', and 

 palatine bones. Operculum with a straight spine; preoperculiim armed. Plight branch- 

 iostegals. Gilllaminte rather short; gill-rakers rather long, lanceolate and widely set; 

 pseudobranchise none. (Giinther.) 



PTKItOIDOXUS QUINCJUARIUS. 



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

 (loiiiiH qamqimrius {Inc. cit.), Pl. XKii, Fig. B, Iti inches long, obtained by the Challenger 

 oS the coast of Japan (station 2.35), at the depth of 505 fathoms. 



DICROLENE, Goode and Bean. 

 Dicrolene, Goode and Bean, Bull Mils. Coiup. Zool., x, 202.— GOntuer, Challenger Report, xxil, 1887, 107 



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

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

 the maxillary much dilated. Eye large, placed ch)se to the dorsal |)roflk'. Head with supra- 

 orbital spines; several strong spines on the preoperculum, and one long spine at the upper 

 angle of the operculum. Snout short, not projecting beyond the ui)perjaw. Jaws nearly 

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

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

 gilUaminaj of moderate length. Gill-rakers rather long, not numerous, rsendobranchia', 

 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 covered with small scales. Lateral line close to the base 

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

 siphonal. Pyloric cjeca few, rudimentary. Intestine shorter than body. 



Faradicrolene, Alcoek (Ann. and i\lag. Nat. Hist., 18S!», ;iS7), is S(j close to Divrolcnc that 

 weare unable to distinguish it. It is represented by a single species, i>. multijilis (Alcoek), 

 loc. cit, from the Bay of Bengal, 1 !)•■'. fatlioms, lat. 20^ 17' 30" N., Ion. S8" 50' E., and from 

 the Andaman Sea, east of Port Blair, 271 fathoms, and oft' the (Joromaudel coast. 

 19SGS— No. 2 22 



