166 BULLETIN 120^ UNITED STATES NATIONAL MUSEUM 



Description. — Carapace suborbicular, save for the rostrum, very 

 convex in both directions, densely punctate and with four lateral 

 teeth, the first three acute, the last one blunt, tuberculiform ; two 

 small, obscure tubercles on anterior part of gastric region. Rostrum 

 with strongly convergent margins, bifid at extremity, notch narrow. 

 Postocular lobule minute, formed by a thickening of the orbital rim, 

 and separated by a sinus from an infraorbital lobule. Antennae 

 not exceeding rostrum. Chelipeds of old male no longer than first 

 leg; tubercles or stout spines on the upper surface near the proximal 

 end and one or two smaller ones on the lower surface; carpus with a 

 short, stout spine or tooth at the antero-internal angle; manus com- 

 pressed, little dilated; fingers stout, dentate, narrowly gaping to 

 near the extremity; prehensile teeth strong. Ambulatory legs 

 shorter than in allied species, especially the dactyli which have two 

 rows of strong, graduated, horny spinules beneath; propodites with 

 an obscure tubercle or tooth below near distal end. Fifth segment 

 of male abdomen longer than sixth. 



Color. — Yellowish with red dots (Tozzetti) . 



Measurements. — Male (21903), total length of carapace 94.5, width 

 83.2 mm. 



Habitat. — In crevices of rocks in deep water (Bell) . 



Range. — Panama (?); Peru to Trinidad Channel, Patagonia. 



Material examined. — 



? Panama; J. M. Dow; 1 female (2402), from Boston Soc. Nat. 

 Hist. 



Callao, Peru; U. S. Exploring Expedition, J. D. Dana; 1 female 

 (2365). 



Cobija, Chile; specimen in Copenhagen Mus. 



San Felix Island, Chile; about lat. 26° S., long. 80° W.; 1 male; 

 photograph lent by C. E. Porter and returned to him. 



Valparaiso, Chile; U. S. Exploring Expedition, J. D. Dana; 1 

 male, 1 female (2367). 



Talcahuano, Chile; April, 1872; U. S. C. S. Str. Hassler; 10 male 

 and female (2027, M. C. Z.). 



Puerto Corral, Province of Valdivla, Chile; C. E. Porter; 1 very 

 young; returned to sender. 



Port Otway, Patagonia; February 9-10, 1888; Albatross; 3 males, 

 3 ovigerous females, encrusted with small Serpulids (21903). 



West coast of South America; Dr. H. E. Ames, U. S. N.; 1 female 

 (18138). 



Locality not given; 1 large male (2410). 



