THE CHISMOPNEA (CHIMAEROIDS). 85 
@e 
a strong spine, erectile, near the head. Second dorsal low, elongate. Caudals 
narrow, tapering; subcaudal without a produced lobe. Anal small or indistinct. 
Teeth all receiving impact on the edges. Mandibulars, palatines, and vom- 
erines with tritors on the forward edges of the laminae. Lateral line an open 
canal, specially modified in the apertures on the head. Tail with or without a 
filamentary appendage. Vertebral axis in the tail on about the same level 
as that of the body. Notochord surrounded by narrow rings. Hemispheres 
of the brain close to the olfactories, more distant from the optic lobes. Claspers 
of the male trifid, rarely bifid. Males with erectile frontal and prepelvic 
tenacula. 
CHIMAERA. 
Chimaera Lrnne, 1754, Mus. Ad. Frid., 1, p. 53; 1758, Systema, 1, p. 236; 1766, Syst., 1, p. 402. 
Snout soft, prominent, not produced. 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. 
Anal fin distinct from the subcaudal 
Caudal filament long 
Eyes 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 banded with brown 
monstrosa 
Lateral line irregular, not waved 
Claspets divided one third of their length 
Iridescent dark brown, with lighter streaks on tail 
purpurascens 
Mottled with light, tail with light streaks 
owstonr 
Lateral line in short waves on the flank 
Claspers divided one half their length . . phantasma 
Anal fin not distinet 
Caudal filament long 
Kyes large 
Second dorsal not indented 
Lateral line not in short waves 
Claspers trifid half their length : . mitsukurit 
