OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 47 



Measurements. — Ovigerous female, liolotype (55957), length of 

 carapace 16.6, width 18 mm. Largest specimen, male (66793), 

 length of carapace 23.5, width 24 mm. 



Range. — North Carolina to Yucatan and Jamaica; 14 to 60 fathoms. 



Material examined. — See table 11, page 48. 



HYPOCONCHA ARCUATA Stimpson 



Plate 11, Figures 1-4 



Hypoconcha arcuata Stimpson, Proc. Acad. Nat. Sci. Philadelphia, 1858, p. 226 

 [64]; nomen nudum, Ann. Lye. Nat. Hist. New York, vol. 7, p. 72 [26], 1859 

 (type localities, South Carolina and St. Thomas; types not extant). — Bouvier, 

 Bull. Mus. Hist. Nat., Paris, vol. 4, p. 375, 1898.— Benedict, Bull. U. S. 

 Fish Comm., vol. 20 (1900), pt. 2, p. 133, 1901.— Hay and Shore, Bull. U. S. 

 Bur. Fisheries, vol. 35 (1915-16), p. 418, pi. 31, fig. 3 (not 2), 1918. 



Diagnosis. — Lower surface everywhere granulate. No tubercles on 

 carapace; many small spines on margin of anterior half. Chelae 

 densely and coarsely granulate, rough along middle line. 



Description. — Lateral lobe of carapace strong. Front margin densely 

 ciliated, nearly semicircular in outline, a shallow V at middle, followed 

 by a "buttonhole" in the old, or a short open fissure prolonged for some 

 distance by a shallow sulcus. A minute notch either side of middle, 

 continued on the under side by a narrow fissure in front of the eye for 

 the lodgment of the antennary flagellum; outer posterior margin of 

 orbit fissured. Granules of carapace larger than those of appendages. 

 Distal and outer margins of merus of maxilliped thin and meeting at 

 a prominent sharp angle. Carpus of cheliped as broad as long, gran- 

 ules crowded. Granules heaped up and acute through middle of palm. 



Measurements. — Female (53404), length of carapace 12, width 13 

 mm. Male (S. U. I.), length of carapace 23.6, width 23 mm. 



Range. — North Carolina to Brazil; 1 to 22 fathoms. 



Material examined. — See table 12, page 49. 



HVPOCONCHA PANAMENSIS Smith 



Plate 9, Figures 6, 7 



Hypoconcha panamensis Smith, in Verrill, Amer. Nat., vol. 3, p. 249, 1869 (type 

 locality, Panama, under valve of Pecten ventricosus; type in P. M. Y. U.). — 

 Bouvier, Bull. Mus. Hist. Nat., Paris, vol. 4, p. 375, 1898. — Rathbun, 

 Proc. U. S. Nat. Mus., vol. 38, p. 594, 1910. 



Hypoconcha digueti Bouvier, Bull. Mus. Hist. Nat., Paris, vol. 4, p. 374, 1898 

 (type locality, La Paz Bay; type in Paris Mus.). — Rathbun, Bull. Amer. 

 Mus. Nat. Hist., vol. 48, p. 620, 1923. 



Hypoconcha peruviana Rathbun, Proc. U. S. Nat. Mus., vol. 38, p. 553, pi. 47, 

 fig. 2, 1910 (type locality, Matapalo; type, U. S. N. M. no. 40474). 



Diagnosis. — A prominent crescentic lobe on the carapace either side 

 of buccal region. Carpus and manus of cheHped with a raised Une of 

 granules above; carpus bordered with hair below and at proximal end; 

 manus with several longitudinal rows of granules outside and three 

 granulated lobes near the fingers. 



