254 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



OSACHILA GALAPAGENSIS Rathbun 



Plate 82, Figure 5; Plate 83, Figure 3 

 Osachila galapagensis Rathbun, Proc. Biol. Soc. Washington, vol. 48, p. 3, 1935. 



Type locality. — Wenman Island, Galapagos Islands, 100-150 fath- 

 oms; Hancock Galapagos expedition, holotype, female (69215). 



Diagnosis. — The two largest branchial elevations are more exten- 

 sive than in antillensis. Tubercles of palm sharper. Margins of 

 ambulatories distinctly dentate. 



Description. — Anterolateral margin with sharp denticles, three of 

 which project beyond the others; the first and second of these termi- 

 nate narrow, transverse ridges. The highest and largest branchial 

 elevation is continued to the gastric region, its posterior slope divided 

 by a wavy line of punctae, subparallel to posterior margin. Besides 

 the tubercle at the posterior corners of the cardiac region there is a 

 pair at the anterior corners, nearer together, narrow, obUque, and 

 pointing backward and inward. Sides of terminal segment of female 

 abdomen curved outward, not straight as in antillensis. Tubercles 

 of palm and fingers acute and fairly well separated. Six or seven 

 acute teeth on lower margin of palm. The thin edges of the ambu- 

 latory legs — merus, carpus, and propodus — are cut into numerous 

 projecting teeth. 



Measurements. — Female (69215), length 20.6, width 24.7 mm. 



Range. — Galapagos Islands, 10 to 150 fathoms. 



Material examined. — See table 84, page 255. 



OSACHILA LEVIS Rathbun 



Plate 78, Figures 3, 4 



Osachila levis Rathbun, Proc. U. S. Nat. Mus., vol. 21, p. 012, 1898 (type locality, 

 off Cape St. Lucas, 31 fathoms; type, U.S.N. M. no. 21598). 



Diagnosis. — Carapace smooth to naked eye. Cardiac lobe single, 

 trilobate in form, broadest in front. Surface of manus covered with 

 coarse tubercles forming about 12 irregular, crowded rows. 



Description. — Resembling antillensis; metabranchial lobe similar in 

 size and shape; on the inner side of its point a small round lobe. 

 Lobes of carapace coarsely punctate, depressions finely so. Antero- 

 lateral margin dentate in its anterior half only, the longitudinal 

 portion subentire; the four thick posterolateral teeth project scarcely 

 beyond the margin except for the anterior tooth wliich is directed 

 slightly sideways at the lateral angle of the carapace. Upper margin 

 of manus with three denticulated teeth. 



Measurements. — Female holotype (21598), length of carapace 19.1, 

 width 21.4 mm. 



Range. — Mexico to Ecuador; 12 to 60 fathoms. 



Material examined. — See table 85, page 256. 



