THK CIllS.MOI'XKA (CHIMAKIJOIDS). 93 



till' aiilcriiir lu'ii;lit llicn rising' to alxxit tliri'c times the hcijilil of tlic middle 

 portion. Interdorsal space ecjual to tlie base of tlie first dorsal, traA'ersed by a 

 low fold. N'oiuerine teeth with from live to seven rods. Lateral line on the 

 flank neai-ly straif^ht; juji;ular section meeting the postorlntal near its junction 

 with tlie suborbital and the angular. Dorsal spine not reaching the origin of 

 the second dorsal. .\nal rudimentary or absent. 



Back brownish, shacUng to white or yellowisii below; sides with numerous 

 iiTcgular romnleil s[)ots of white or yellow. 



Near the shores, California and northward. 



Rhinochimaeridae. 



Rhiiiiirhimdiriilnc Oahman, H»I)1, Proc. N. E. Zool. Cliili,. 2. ]k 11; I'.Mit, Bull. M. C. Z., 41, |i. 270. 



Head elongate. Snout mueli produced, in a slendei- jxiint. Pectorals 

 large, free. First dorsal with a strong, erectile sjiine, fin short, close to the skull. 

 Second dorsal low. Anal not distinct from the subcaudal. Subcaudal well 

 developed, witliout a produced lobe, ("audals tapering backward to a filament. 

 Lateral line an open groovi' with closely set ribs. Notochord surrounded by 

 narrow rings, unsegmented. 



Hemispheres of the brain remote from the olfactories and the optic lobes, 

 comiections very slender. Males with a frontal tenaculum and prepelvic tena- 

 cula. C'las]iers of the male slender, distally ending in a volute knob with hooked 

 spines. 



Snout compressed 



Cutting edges of vomerine plates not sinuous, without tritors 



tapper edge of supracaudal spinose . . . Rhinocliimacra 



S!iout depressed 



Cutting edges of Nomei'ines sinuous or notched, with tritors 



Upper edge of sujjracaudal not spinose .... Harriotla 



Rhinochimaeka. 



Rhinochiinii 111 (Iaiiman, ISIU, I'roi'. X. K. Ziml. Clul>, 2, p. 7.^. 



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 sui)racaudal fin the upjier 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, intluced bv lack of curvature of the forehead. 



