PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 217 



Srjno2}8is. 



la. Mouth moderate ; cephalic spine with its basal element exserted and con'iuuous 

 with the distal ; pyloric ccEca develojied (2). 

 2a. A second dorsal spine typically developed ; mouth with the cleft subvertical ; 

 Ist D. with few rays ; branchiae in 2-J pairs ; branchial arches unarmed ; 



skin with scattered spinigerous scuteUse Ceratiin^. 



Cer alias. 

 \a. Mouth moderate ; cephalic spine with its basal element subcutaneous, procumbent, 

 and at right or acute angle with the distal ; pyloric cceca none. 

 2a. A second dorsal spine developed; branchise in 2^ pairs; branchial arches un- 

 armed ; body' naked. 

 3. Body and head compressed ; mouth with the cleft nearly horizontal, and 



mandibular articulation behind eye Oneirodinje. 



Oneirodes. 



2. No second dorsal spine developed; branchiae in |2| pairs; branchial arches 



armed with dentigerous tubercles ; body with ecattered tubercular 



scutellaj. 



3. Body and head compressed ; mouth with the cleft oblique ; mandibular 



articulation under or behind eye Himantolopiiix^. 



4a. Body oblong oval ; dorsal fin with about 9 rays, and pectoral with 



about 12? nimantoloplius. 



46. Body short oval ; dorsal fin with 4 rays, and pectoral with about 

 17 Corynolopliiis. 



CEEATIIN^. 



Ceratiids with the body and head compressed ; moath with moderate 

 and almost or quite vertical cleft; branchiae in 2h pairs; branchial 

 arches unarmed ; spinous dorsal represented by a rostral spine, as well 

 as, generally, by a second, whose hasal element is exserted; soft with few 

 rays, placed quite far back of the head ; pyloric cceca developed (2;. 



CERATIAS.* 



Ceratiiues with an oblong form; skin prickly; vomer toothless; 



cephalic spine elongated, and with a simple capitate extremity; second 



dorsal spine well developed, and pectorals multiradiate {L e., with about 



20 rays). 



Ceratias Holbollii. 



1844 — Ceratias Holbollii Kroyer, Naturhist. Tidskrift, 2. rsekke, b. i, pp. 639-649. 

 18G1 — Ceratias Holbolli Gilnther, Cat. Fishes in Brit. Mus., v. 3, p. 205. 



Ceratias with cephalic spine reclinable beyond base of caudal fin, and 

 candal fin longer than body exclusive of head. 

 Deep sea along Greenland (known from several specimens). 



OMEIKODIN^. 



Ceratiids with the body and head compressed ; mouth with moderate 

 and almost horizontal clelt; brancbiai in 2J pairs; branchial arches 

 unarmed; spinous dorsal represented by a (1) rostral spine, whose basal 

 * Ceratias, ictfjanar, ov, />, one that has horns, in allusion to the frontal ray. 



