106 BULLETIN 150, UNITED STATES NATIONAL MUSEUM 



D^. Anterior dorsal rays weak, their tips not projecting above the fin 

 membrane, usually buried in pseudotissue. 



G^ Lower lobe of the pectoral shorter than the head; color pale or 

 dusky. 

 H^ Gill slit in front of 3 or 4 pectoral rays; depth less than 6. 



I^. Pectoral 33; snout projecting; eye 3 in the head simus. 



P. Pectoral 35; snout not projecting; eye 4.8 in the 



head mollis, 



H^. Gill slit above the pectoral or in front of the upper ray. 

 J'. Occiput high; depth 5 or less. 



K'. Snout projecting; skin on the head extremely lax; the 

 pores on the chin and snout in pits; body much 

 compressed. 



L^. Pectoral 30; disk 3.5 sinensis^ 



U. Pectoral 24; disk 4.2 segaliensis. 



K*. Snout not projecting; skin not lax; pores on head not 

 in pits; body stout, little compressed. 

 M^ North Pacific: anal 46; pectoral 37; disk 



5 bowersianus» 



M^. South Atlantic; anal?; pectoral? 

 N^. Pectoral notched; rays 31; disk 2.2_falklandica, 



N^. Pectoral unnotched? pallidas, 



J*. Occiput not high; depth distinctly more than 5. 



O'. Disk 3.7; lower lobe of the pectoral 1.5, first 

 dorsal ray elongate, equal to the orbit,, 

 longer than the 3 or 4 succeeding rays; 

 stomach pale; peritoneum black. 



attenuatus, 



O^. Disk 2.7; lower lobe of the pectoral 2.4; first 



dorsal ray about equal to one-half the eye, 



shorter than the second ray; stomach black; 



peritoneum pale, dotted homopterus. 



G^. Lower lobe of the pectoral longer than the head ; teeth very stout, 

 the lateral lobes nearly equal to the central lobe; color black. 



rhodomelas. 

 C*, Teeth more elongate, slender (cf. mollis, melanurus, sinensis), simple, 

 sometimes arrow shaped, the lateral lobes hardly evident, (cf. opistho- 

 tremus, gilberii), frequently recurved; peritoneum pale or black. 



P'. Teeth rather short and stout, (see ovigerum) , 

 the cutting surfaces oblique; peritoneum 

 pale to black. 

 Q'. Gill slit above the pectoral. 

 R'. Pectoral more than 25. 

 S*. Disk as large or larger than the eye, 

 not much cupped. 

 T*. Body slender; depth more than 5. 

 Atlantic. 

 U*. Eye less than 4 in the head; 

 pectoral notch hardly evident. 

 ranula. 

 U*. Eye more than 4 in the head, 

 v. Pectoral notch shallow; dor- 

 sal 47; anal 41..micropus. 



