250 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



ANALOGOUS SPECIES OF OSACHILA ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



antillensis. galapagensis. 



OSACHILA TUBEROSA Stimpson 



Plate 77, Figube 3 



Osachila tuberosa Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 154, 1871 (type 

 localities, five stations among the Florida reefs, 36-68 fathoms; cotypes not 

 extant). — A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, p. 20, 1880 

 (part; specimen from Sombrero, 54 fathoms). — Rathbun, Bull. Lab. Nat. 

 Hist. State Univ. Iowa, vol. 4, p. 290, 1S98 (part; specimen from Station 

 24); Proc. U. S. Nat. Mus., vol. 50, pp. 647, 649, pi. 36, fig. 3, 1916.— Hay 

 and Shore, Bull. U. S. Bur. Fisheries, vol. 35 (1915-16), p. 423, pi. 31, fig. 

 10, 1918. — A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., vol. 

 47, p. 304 (.part), not pi. 4, fig. 4, 5, 1923.— Boone, Bull. Bingham Oce- 

 anogr. Coll., vol. 1, p. 43, 1927 (part; not antillensis or semilevis). 



Diagnosis. — Carapace not eroded all over; posterolateral margin 

 thin-edged, armed with triangular teeth, the first one, which is situ- 

 ated at the lateral angle of the carapace, projected sideways beyond 

 the anterolateral margin; fourth or last tooth prominent, larger than 

 the two preceding. Cardiac region rounded behind. Upper margin 

 of palm tridentate, proximal tooth bifid. 



Description.' — Six large protuberances on carapace: One mesogas- 

 tric, one metagastric (paired), one cardiac, one mesobranchial (paired). 

 Protuberances and lateral margins finely eroded, as if worm-eaten. 

 Lobes of front thick, separated by a deep closed or narrow button- 

 hole fissure. Anterolateral margin (continued toward the buccal 

 cavity) finely dentate. Posterolateral margin wdth four larger teeth 

 or lobes, including the one at lateral angle. Maxillipeds, sternum 

 and bases of legs below, eroded. Chelipeds eroded; upper margin of 

 manus tridentate, outer surface covered with reticulating ridges and 

 8 or 9 tubercles. Margins of legs thin, punctate. 



Color. — Sand color with reddish cast, white below, claws and legs 

 white. (Henderson.) 



Measurements. — Female (8746), length of carapace 18.2, width 

 20.2 mm. 



Range. — North Carohna to Florida; 40 to 65 fathoms. 



Material examined.— See table 81, page 252. 



