2106 Bulletin //, United States National Mztseiim, 



young, some or all becoming angular or bluntly arrow-shaped in the adult: 

 caudal fin well developed, rather broad, 

 c. Doraal fin divided by a deep notch, which separates the slender spines from 

 the soft rays. ISTeolipabis, 784. 



ec. Dorsal hu continuous, the spines not separated from the soft rays. 



LiPAEiS, 785. 

 66. Ventral disk more or less reduced in size or degraded in structure, becoming 

 anterior iu position ; teeth simple or tricuspid only in the very young ; ver- 

 tebrae numerous. 

 d. Caudal well developed; teeth slender, curved, in cardiform bands, the 

 inner longer, depressible; ventral disk large; skeleton very soft. 



Bathyphasma, 786 

 dd. Caudal fin slender, not distinct from other vertical fins ; teeth simple in 

 the adult; vertebrae numerous; dorsal rays 35 to 50; anal 33 to 46 

 Anterior nostrils usually without tubes; ventral disk very small 

 nearly under the eye ; the vent close behind it. 

 e. Pectoral fins with the lower lobe well developed; gill openings mod 

 erate or small, not greatly reduced. Caeeproctus, 787 



ee. Pectoral fins not notched, the lower lobe obsolete, the rays progress- 

 ively shortened ; gill openings reduced to a small pore. 



Gyrinichthys, 



AMITEIN^ : 



aa. Ventral disk entirely wanting; no ventral fins; teeth mostly simple in the adult 

 vertebr;B and fin rays in large number. 

 /. Pseudobranchiib present; lower lobe of pectoral produced. Amitra, 789 



/. Pseudobranchise wanting. 



g. Tip of snout without barbel. Paralipaeis, 790 



gg. Tip of snout with a pair of barbels ; snout projecting. 



Khinolipaeis, 791 



784. NEOLIPARIS, Stoindachner. 

 Neoliparis, Steindachnek, Ichth. Beitr., iii, 54, 1875 (nntcosus). 



This genus difters from L'qmris iu having a deep notch in the dorsal fin 

 anteriorly, separatiug the spines from the soft rays. The species approach 

 more nearly to the Cottoid type, from which the Liparids are descended. 

 In general the vertebrix; are fewer, the tin rays fewer, the ventral disk 

 larger, and the vertical fins better separated than in the more degenerate 

 members of the family. The retention of the notch between the dorsals 

 fully justifies the recognition of Neolqjaris as a distinct genus, (veoi, 

 uflw; Liparis.) 

 a. Gill opening very narrow, almost entirely above base of pectoral, the lower edge not 

 below third pectoral ray. 

 6. Anterior nostrils with distinct tubes. 



c. Dorsal spines iu the male greatly elevated, not connected by membranes 

 except at extreme base. 

 d. Dorsal rays about 25 ; anal 23 ; head small ; ventral disk small. 



atlanticus, 2442. 

 dd. Dorsal rays 26; anal 23; head larger; ventral disk comparatively large. 



RUTTEEI, 2443. 



cc. Dorsal spines not especially elevated; dorsal rays 34 to 36; anal rays 25 to 



28; lower jaw included; form rather elongate, the head depressed; 



ventral disk 2i in head. Color pale, irregularly dotted with darker, 



sometimes plain brownish. CALLYODON, 2444. 



