16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Description: Carapace, chelipeds, and ambulatories covered dor- 

 sally with a labyrinth of smooth, elevated ridges separated by deep fur- 

 rows boi'dered with a fine pile. Punctae few in number as compared 

 with other members of the genus, 3M having but two, both median, 

 and the cardiac areole also but two, transversely placed. 3M continued 

 forward as a long median spike, not confluent laterally with the inner 

 protogastric ridge. Outer protogastric areole independent of inner, 2L 

 and 3L separated. Front deflexed, the thickened lobes separated from 

 the adjacent posterior areole by a continuous furrow which communi- 

 cates with the orbital hiatus. 5L slightly higher than the rest of the 

 carapace. Teeth N,T (of Dana) not projecting beyond the arc of the 

 anterolateral border, E,S but slightly projecting. Male abdomen con- 

 stricted between segments 5 and 6, the transverse ridges of the central 

 portions parallel and not joined to the corresponding prominences on 

 the lateral margins of the abdomen. 



Chelae subequal, the tubercles of the hand mammilliform, their bases 

 not tending to coalesce. Fingers of both claws strongly grooved, the 

 four or five large teeth fitting closely together, the movable finger 

 smooth at base. Both ischium and merus of the third maxilliped moder- 

 ately furrowed, merus strongly notched for insertion of palpus. Dactyls 

 of ambulatories granulate, densely wooly. 



Color in life: Dark areas on carapace a rich violet carmine, a little 

 more reddish on branchial and posterior areas. Light areas cadmium 

 orange on frontal, gastric, and cardiac regions; branchial and intestinal 

 regions same color but lighter in tone. Chela violet carmine on dark 

 areas; fingers very dark seal brown, fading toward tips, which are al- 

 most white. Ambulatory legs burnt lake on dark areas and light cad- 

 mium orange on light areas. Nail of dactyl amber. Eyestalk pale orange- 

 yellow; eye blackish brown. (Petersen) 



Range: The 21 specimens secured by Velero III collectors were 

 from Charles, Albemarle, James, South Seymour, and Tower islands, 

 Galapagos, under rocks at low tide. 



Remarks: While at the Museum of Comparative Zoology at Cam- 

 bridge in the summer of 1937 the writer was afforded the opportunity 

 of examining, through the courtesy of Dr. Fenner A. Chace, Jr., a 

 specimen of Glyptoxanthus labyrinthicus (Stimpson) (1860) male, 

 type (M.C.Z. 1295) and of comparing with it Hancock material taken 

 in the Galapagos Islands. Additional specimens collected in Panama by 

 Dr. Maack (M.C.Z. 2218) and S. W. Garman (M.C.Z. 2306) and 



