Classification of the Order Pediculati. 287 



tractile, oblique or subvertical, luoderately wide ; teeth in 

 jaws acicular, tlepressible ; palate toothless. Spinous dorsal 

 represented by a long slender illieium with terminal bulb 

 inserted on the upper surface of the jjead, and by a second 

 post-cephalic spine, sometimes replaced by 2 or 3 caruncles ; 

 soft dorsal and anal short, posterior, each of 3 or 4 rays ; 

 pectorals small. 



Pri\i maxillary pedicels moderately long ; maxillaries ex- 

 panded and truncated distally. Skull long and narrow ; 

 frontals meeting throughout their length; supraoccipital 

 narrow, forming the floor of a groove which is bounded 

 laterally by the large parietals (fig. 6, B) ; epiotics not pro- 

 minent on upper surface of skull ; opercles narrow. Three 

 pectoral radials. Vertebra3 20 (ll+i)). 



Geneia : Ceratias, Mancaliafi, Cryptosparas. 



Family 2. Himantolophidas. 



Mouth not protractile, vertical, oblique or horizontal, wide 

 or moderately wide ; teeth in jaws acicular, depressible ; 

 vomer sometimes toothed. Gills 2^ or ^ + 2^, the first arch 

 with or without a hemibranch. Spinous dorsal a supra- 

 rostral illieium with terminal bulb, sometimes followed by a 

 second ray ; soft dorsal and anal posterior, short, few-rayed ; 

 pectorals small. Pra^maxillary pedicels short ; maxillaries 

 slender ; opercles narrow ; skull with a large trough 

 superiorly, the floor formed mainly by the large supra- 

 occipital, which extends forward to the ethmoid region, the 

 margins formed by the frontal ridges, which end posteriorly in 

 a pair of prominent spines borne by tliesphenotics (fig. 6, A) ; 

 frontals completely separated ; parietals absent (or ankylosed 

 with the spbenotics). Two pectoral radials. Vertebrae 

 19 (10 + 9). 



Synopsis of the Genera. 



I, Spinous dorsal of two rays. 



Second ray of spinous dorsal above 



pectorals Oneirodes, Liitken, 1871. 



Second ray of spinous dorsal immediately 



behind the first Diceratias, Giinth., 1887 (incl. 



Paroneirodes, Alcock, 1890). 



II. Spinous dorsal of a single ray. 



A. A long hyoid barbel, bifid distally. 



Linvphryne, Coll., 18S6. 



