THE CANCROID CRABS OF AMERICA 307 



Great Bay, Wacao, Curagao; % fathom; among algae; October 3, 

 1905; J. Boeke; 1 male (Leiden Mus.). 



Caracas Bay, Curagao; under stones near shore; May 3, 1920; 

 C. J. van der Horst; 1 female (Amsterdam Mus.)- 



Locality not given; 1 small specimen about 9.6 mm. wide, labeled 

 "Cancel' parvulus," perhaps type (Kiel Mus.). 



Locality not given; 1 specimen labeled "Alphaeus parvulus" (Copen- 

 hagen Mus.). 



LEPTODIUS AGASSIZn A. Milne Edwards 



Plate 141, Figures 4 and 5 

 Leptodius agassizii A. Milne Edwards, Crust. R^g. Mex., 1880, p. 270, pi. 49, 



fig. 3 (type-locality, Florida Reefs, 12 to 18 fathoms; type in Mus. Comp. 



Zool.). 

 Xantho species. Smith, Rept. Commr. Fish and Fisheries, 1885 (1886), p. 630 [26]. 

 Leptodius agassizi A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., 



vol. 47, 1923, p. 313, pi. 2, fig. 8; pi. 5, fig. 2. 



Diagnosis. — Antero-lateral teeth thick, subconical or pyramidal, 

 acute. Carapace rough with granules. Dorsal surface of chelipeds 

 covered with granulate tubercles. Color of fingers not continued on 

 palm. 



Description. — Lobulation of anterior two-thirds of carapace well 

 marked and ornamented with bead granules arranged either in short 

 transverse lines or in clusters; posterior third, behiad line of gastro- 

 cardiac suture, finely granulate. Front little advanced, bimarginate; 

 upper margin of lobes nearly straight, oblique; lower margin with a 

 V-shaped median cut, lobes concave, the small submedian lobules 

 more advanced than those at outer angles. Margin of front and 

 orbits granulate. Outer angle of orbit inconspicuous; next two lateral 

 teeth, E and N broad, E very shallow, T and S thick with acute tips 

 turned forward; all the teeth are bordered and surmounted by gran- 

 ules; teeth E, N, T, and S have a flattened anterior surface; the upper 

 margin of this surface in E is continued to the outer angle of the orbit 

 while the lower margin, or subhepatic tubercle, is part of a broken line 

 leading to the buccal angle. This arrangement provides a link with 

 the genus Medaeus. 



Chelipeds very unequal. Inner angle of wrist bidentate; upper- 

 outer surface very rough, the granules arranged mostly on very 

 unequal tubercles. Similar ornamentation on the palm, continued 

 part way down the outer and inner surfaces especially toward the 

 proximal end; a deep superior longitudinal groove. Fingers with 

 punctate impressed lines; color of immovable finger ending obliquely 

 but otherwise not continued on palm. Ambulatory legs sharply 

 granulate above and hairy. 



Measurements. — Male (18008), total length of carapace 11.8; %vidth 

 of same 19.2, fronto-orbital width 10.5, front 4.6 mm. Ovigerous 

 female (53750), total length of carapace 19.6, width of same 31, fronto- 

 orbital width 15.7, front 8.4 mm. 



