THE CHISMOPNEA (CHIMAEROIDS). 93 
the anterior height then rising to about three times the height of the middle 
portion. Interdorsal space equal to the base of the first dorsal, traversed by a 
low fold. Vomerine teeth with from five to seven rods. Lateral line on the 
flank nearly straight; jugular section meeting the postorbital near its Junction 
with the suborbital and the angular. Dorsal spine not reaching the origin of 
the second dorsal. Anal rudimentary or absent. 
Back brownish, shading to white or yellowish below; sides with numerous 
irregular rounded spots of white or yellow. 
1 
Near the shores, California and northward. 
RHINOCHIMAERIDAE. 
Rhinochimaeridae GARMAN, 1901, Proce. N. E. Zoél. Club., 2, p. 77; 1904, Bull. M. C. Z., 41, p. 270. 
Head elongate. Snout much produced, in a slender point. Pectorals 
large, free. First dorsal with a strong, erectile spine, fin short, close to the skull. 
Second dorsal low. Anal not distinet from the subcaudal. Subcaudal well 
developed, without a produced lobe. Caudals tapering backward to a filament. 
Lateral line an open groove with closely set ribs. Notochord surrounded by 
narrow rings, unsegmented. 
Hemispheres of the brain remote from the olfactories and the optic lobes, 
connections very slender. Males with a frontal tenaculum and prepelvic tena- 
cula. Claspers of the male slender, distally ending in a volute knob with hooked 
spines. 
Snout compressed 
Cutting edges of vomerine plates not sinuous, without tritors 
Upper edge of supracaudal spinose 5 : ; Rhinochimaera 
Snout depressed 
Cutting edges of vomerines sinuous or notched, with tritors 
Upper edge of supracaudal not spinose  . ; : . Harriotta 
RHINOCHIMAERA. 
Rhinochimaera GARMAN, 1891, Proc. N. I. Zodl. Club, 2, p. 75. 
This genus is distinguished by an elongate compressed snout, a nearly 
straight forehead; teeth without tritors, notches, or sinuations on their cutting 
edges; a low supracaudal fin the upper edge of which is armed with spines, and, 
on the male sex, by a shortness and straightness of the stem of the frontal tena- 
culum, induced by lack of curvature of the forehead, 
