316 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



b. Pronpcrculum unariiied. A siu);l<' spiuo on opiTciiluiu. Lateral linn a1>sont( ?) 



i. Vcntrals each a pair of (ilamciits, closely iiiiitecl throiigUout, aiiproxiiiiatc. .MixoNUS 

 n. Ventrals inserted on hnmeral syni]ili,vsis. 



1. Lateral line continuous, indistinct. 



a. Ventrals a pair of simple lilanients. 



i. Pseudolir.inchiie present SlIiEMUo 



il. Pseudoljranchhe absent Moxomitopu.s 



2. Lateral line obsolete (in almost every case). 



a. Ventrals bitid filaments. 



i. Teeth in villiforni bands on jaws, vomer, ami palatines. Head strongly armed. 



•Eyes minute. Snout aniu;d ACANTHONUS 



b. Ventrals simple filaments. 



i. Eye rudimentary or absent. 



* Body with small, deciduous scales. No later.al line. 



t Eye not visible extern.ally. Villilbrm bands of teeth on .jaws, vomer, and 



palatines Typhloxiis 



** Body naked. NotocUord iicrsistcnt. 



tEye visible through skin. A few fang-like teeth on vomer and mandi- 

 ble liAnATIIRONUS 



ttEye not visible. No teetli on maxillary or palatines. Rudimentary teeth on 

 vomer. Small teetb on mandible Aphyonus 



C. Ventrals inserted under hyoid region. 



1. Ventrals long bifid filaments. 



a. Weak teeth, in, jaws only Riiohiciitiiys 



D. Ventrals absent. (Uncertain as to family and sul>family.) 



1. Eyes rudimentary. 



a. Head and body scaleless. 



i. Mouth vertical, vomer and palatines toothless Alexeterion 



2. Eyes developed. 



a. Head uncrestod, scaleless. No lateral line. 



i. Villiforni teeth in jaws, vomer, and palatines. 



* Fin rays very delicate. B. 8. 



t Gill-rakers almost rudimentary IIepiithocaha 



6. Head crested, scaly. 



i. Lateral line of large, siiocialized scales Lamprogrammu.s 



Genus BYTHITES. Reinhardt. 



Bythites, Risi'SnxKDT, Dansk. Vidensk. Selsk. Af handl., vii, 1838, 178. — GLiNriiEn, Cat. Fish. Brit. Mus., iv, 

 375._(jiLL, Proc. Acad. Nat. Sci. Phila., 1863, 253.— Jordan and Gilbert, Bull, xvi, U. S. Nat. Mu.s., 795. 



Brotulids liaving the body elongate, covered with minute scales, and with lateral line 

 interrupted over the vent. Head thiciv, naked, with cirri; nioutli large and jaws equal. 

 A small spine at the angle of the oi)ercuhifu. Teeth in bauds on jaws, vomer, and pala- 

 tines. Eye moderate. Vertical fins confluent; ventral fins, a pair of bifid filaments, each 

 composed of two rays closely united nearly to the tip. Branchiostegals S; gill ntein- 

 braties closely united, free from the isthmus. Air bladder large. Two pyloric cajca. No 

 barbel. A thick, conical aual papilla (in the male). 



liVTHITES FUSCUS, Reinhardt. 



Htjthitcs fuscm, Reinhardt, Dausk. Vidensk. Selsk. Afliandl., vil, 1838, 170, pis. vii-viii. — GCnthk.u, oj). 

 cit., 375. 



A BytMtes,hiiYmix a body somewhat compres.sed, lii)ariform, its height about 4i times 

 in its length. Head thi('k and large, its lengtli more than onelbiirtli that ol' body, with 

 obtuse snout, naked, with minute cirri. Mandible, long, curved; it extends far behind 

 vertical from posterior margin of orbit. Eye small. Scales moderate, on body. Lateral 

 line complete, but iiitenupted over vent, the two i)arts slightlyoverlapping tlie same vertical. 

 Vertical fins confluent, enveloped in thick .skin. Pectorals broad, lanceolate, with bioad 

 base. Ventrals filiform, reaching behind origin of pectoral, as long as pectoral and two- 

 thirds as long as head. A conspicuous anal papilla in the male. 



The oidy known siiecimen, uow in the museum at Copenhagen, was obtained in (Irecn 

 laud half a century ago. 



