206 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Of oco 

 t^ r^ o 



l-lrHCO 



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53 



'oti'o O^ 



fe^ 



SS 



front deep and narrow behind, lateral 

 orbital hood without tooth at outer angle, 

 sinuses shallow, broadly -shaped. Pre- 

 Teeth of supraorbital margin triangular, 

 blunt, outer sinus somewhat shallower 

 than the others. Outer orbital tooth very 

 narrow, straight or a little convex, blunt, 

 pointing straight forward. Antero-lateral 

 teeth two, distant, thick, blunt, posterior 

 margin convex, anterior straight or a little 

 concave. Posterior margin with six or 

 eight tubercles, of which four are largo 

 and prominent. Outer lobe of suborbital 

 margin very convex, inner lobe very ob- 

 lique, slightly convex, inner angle an acute 

 tooth; this lobe is a little more than half 

 concealed in ventral view by the large 

 blunt-pointed pterygostomian tooth, which 

 is slightly deflexed and is much more 

 advanced than the lower margin of the 

 orbit. 



Chelipeds of male weak, the left manus 

 two-thirds as high as the right, dactylus 

 as long as upper margin of palm. 



Merus of ambulator}' legs narrow, an- 

 gular, with three anterior carinae, upper 

 surface scantily granulous, distal spine 

 narrow, sharp, produced beyond the seg- 

 ment; anterior lobes of carpus feebly de- 

 veloped ; propodus and dactylus of second 

 and third legs wide, posterior margin of 

 dactylus sinuous. 



A transverse ridge on each of segments 

 1-G of the male abdomen, that on sixth 

 segment arched forward. 



Measurements. — Male (17894), greatest 

 length of carapace (approx.) 12.5, width 

 of same 1.5.1, length of second leg 27 

 mm.; female, thin shell (Blake), greatest 

 length of carapace 17.8, width of same 

 20.G mm. 



Range,— GuU of Mexico, 13 to 88 

 fathoms. 



Material examined. — See table. 



