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28 



STALK-EYED CRUSTACEA. 



The peculiar form and arrangement of the white tubercles on the cara- 



pace give to this animal the aspect of a piece of stone coral. 

 Station 3353. 695 fathoms. 1 female. 



a. 



a 



3356. 



546 



3418. 660 



U 



a 



5 males^ 4 fern. (2 ovig.). 

 1 male. 



Family GEOARClNIDiE. 



GECABCINUS Leach. 



Trans, Linn. Soc. London, XL 309, 323, 1815. 



■^ 



. 7 





Gecarcinus malpilensis Fax. 



^ 



Fhte I V. , Fig. 2, 2% 2\ 



Bull. Mus. Comp. ZooL, XXIV. 157, 1893. 



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

 teriorly ; 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 extremity of the lateral genital furrows ; the furrows bound- 

 ing the cardiac region on either side are moderately developed. Front 

 deflexed at a right angle to the axis of the body, deep, concave above the 

 margin, margin not reflexed, granulated. The merus of the outer maxilli- 

 pedris fivc-rided, 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 

 leu-s furnished with six rows of spines. 



° Leno-th, 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 

 O. quadratus Sauss., but the outline of the carapace is very different, being 



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