TllK ( lllSMOPNEA (CHTMAEROIDS). 83 



a strong spine, erectile, near the head. Second dorsal low, elongate. Caudals 

 narrow, tapering; subcavidal without a produced lol)(\ Anal small or indistinct. 

 Teeth all receiving impact on the edges. Mandiljulars, palatines, and vom- 

 erines with tritors on the forward edges of the laminae. Lateral line an open 

 canal, specially modified in tlie ai)ertvn-es on the head. Tail with or without a 

 filamentary apjjendage. Vertebral axis in the tail on aljout the same level 

 as that of the body. Notochord svuTouiidcd by narrow rings. Hemispheres 

 of the lirain close to the olfactories, nioi'c distant from the optic lobes. Claspers 

 of the male trilid, rarely bihd. Males with erectile frontal and prepelvic 

 tenacula. 



Chimaera. 



Chimacra Linne, 17."jl, Mus. A.l. I'liil., 1, p. 5:3; 17oS, Sy.stenui, 1, )>. 2:il); ITGli, 8yst., 1, p. 402. 



Snout soft, prominent, not jiroduced. Mouth inferior. Tritors on the 

 dental laminae in the form of rods. Lateral line of the head with zigzag 

 openings. Anal fin present and distinct; or united with the subcaudal; or 

 rudimentary. 



\ni\\ tin tlistinct from the subcaudal 

 Caudal filament long 

 Ej'es large 



Second dorsal not indented on the upper margin 

 Lateral line in short waves on the flank 



Claspers divided two thirds of their length 



Mottled, clouded, and l)anded with brown 



tnonstrosa 

 Lateral line iri'cgular, n(jt waved 



Claspers divided one third of tlicir length 



Iridescent dark brown, with lighter streaks on tail 



pur [)urasccns 

 Mottled with light, tail with light streaks 



owsloni 

 Latend line in short waves on the tlank 



Claspers divided one half their length . . phantatsina 

 \nn\ fin not distinct 



Caudal filament long 

 Eyes large 



Second dorsal not indented 



Lateral line not in short waves 



Claspers tritid half their length . . tnitfiulcurii 



