MUSEUM OF COMPAKATIVE ZOOLOGY. 157 



ocular. Anterolateral border of carapace armed with three prominent teeth; 

 another minute tooth just back of the largest posterior lateral tooth. Eye- 

 stalks slender ; eyes small, unpigmented, with imperfectly faceted cornea. 

 Chelipeds asymmetrical in the male ; in adults the larger claw is naked, 

 smooth, and ivory-white, like the tubercles on the carapace ; the merus has a 

 few small teeth along its upper margin, most of them near the two ends of the 

 segment ; the upper margin of the carpus is armed with one strong tooth, and 

 is denticulated along its whole length ; the propodus is short, the immovable 

 finger bent down at an obtuse angle with the lower border of the palm ; the 

 dactylus is furnished with small tubercles on its upper border ; both fingers 

 are armed with large blunt teeth on their opposed edges. The smaller claw is 

 slenderer than the large claw, and its fingers are proportionally longer. In the 

 female both chelipeds are of approximately equal size, and resemble both in size 

 and shape the smaller cheliped of the male. The ambulatory limbs are un- 

 armed, but clad with coarse setse. 



Length of carapace, 26 mm.; breadth, 27 mm. 



Station 3353. 695 fathoms. 1 female. 



" 3356. 546 " 5 males, 4 females. 



*' 3418. 660 " 1 male. 



Family GECARCINID^I. 



Gecarcinus malpilensis, sp. nov. 



Carapace very broad and convex anteriorly, flattened and narrowed poste- 

 riorly; surface microscopically granulated; antero-lateral margin rounded, 

 not denticulated ; the median gastric furrow is well marked ; the furrow 

 separating the gastric from the branchial regions does not extend forward far 

 enough to separate the gastric from the hepatic area ; the so called genital 

 area is separated by a pronounced groove from the branchial and cardiac regions, 

 but not from the gastric ; there is a deep indentation at the anterior extrem- 

 ity of the lateral genital furrows ; the furrows bounding the cardiac region on 

 either side are moderately developed. Front deflexed at right angles to the 

 axis of the body, deep, concave above the margin, margin not reflexed, granu- 

 lated. The merus of the outer maxillipeds is five-sided, outer side convex, 

 distal slightly notched, antero-internal straight and parallel to the long axis of 

 the body, forming an obtuse angle with the postero-internal margin, which is 

 slightly concave. Merus and carpus of chelipeds devoid of spines or teeth. 

 Dactylus of the ambulatory legs furnished with six rows of spines. 



Length, 55 mm. ; breadth, 76 mm. ; width of hind border of carapace, 19 mm. ; 

 width of front, 11 mm.; depth of front, 7 mm. 



Malpelo Island, March 5. 1 male. 



This species is very distinct from any previously described. Compared with 

 the previously known species from the Pacific coast, it is nearest to G. quadratus 



