THE SPIDER CRABS OF AMERICA 483 



Color. — Male, brown red, red predominating on outer surface; 

 female, darker bro\vn, without any admixture of red (Bell). Female, 

 dark buff, inclining to brownish (Stimpson). 



Measurements. — Length, 1 inch 7 lines (43.18 mm.), width the same, 

 including the lateral spines each of which measures 3 lines (7.62 mm.) 

 (Bell). Female, length 1.32 inch (33.53 mm.), width 1.2 inch (30.48 

 mm.) (Stimpson). Male, entire length of carapace 45.5, width 

 46 mm.; female, length 35, width 36.5 mm. (Nobili). 



Range. — Cape St. Lucas, Lower California, to Ecuador. 



Localities recorded. — 



Cape St. Lucas, Lower California (Stimpson). Bay of Santa 

 Elena, Ecuador (Nobili). Bay of Guayaquil, Ecuador; 11 fathoms, 

 on sandy mud (Bell). 



MACROCOELOMA LAEVIGATUM (Stimpson) 



Plate 169, figs. 2 and 3 



Pericera laevigata Stimpson, Ann. Lye, Nat. Hist. New York, vol. 7, 1860, 

 p. 181 (type-localit}', St. Thomas; type not extant). — A. Milne Edwards, 

 Crust. R^g. Mex., 1873, p. 56; 1875, pi. 15, figs. 1-le. 



Pericera curvicorna Desbonne, in Desbonne and Schramm, Crust, de la 

 Guadeloupe, 1867, p. 14, pi. 5, fig. 19 (type-locality, Moule, Guadeloupe; 

 cotype in Paris Mus.). 



Macrocoeloma laevigata Miers, Challenger Rept., ZooL, vol. 17 1886, p. 80. 



Diagnosis. — Branchial width not much greater 

 than orbital. No large spines on posterior half of 

 carapace. A long, curved, antennal spine visible 

 from above. 



Description. — Carapace ovate-oblong, convex. 

 Surface covered with a short pubescence and partly 

 with long, curled hairs. Back and sides rounded. 

 Spines and tubercles small and few ; a small spine at 

 the summit of the low, cardiac cone ; a stouter spine 

 on the intestinal region; a spine on each branchial j-jg i36._m a c r o, 

 region a little above the postero-lateral margin but coelomalaevigatum, 



° , . , . ^ .1 1 MALE (46933), BASAL 



not at the widest part of the carapace; a large, antennal article- 

 blunt tubercle near the hepatic border of each gas- x ^ee 

 trie region ; a small branchial tubercle either side of 

 the cardiac region and behind its middle. Orbital tubes large, nearly 

 transverse, the preocular and postocular teeth subequal, the latter 

 more produced. Rostrum between a fourth and a fifth of the length 

 of the carapace, deflexcd, curving downward (concave below) ; horns 

 occupying about two-thirds of the length, regularly tapering, acute, 

 divergent. Movable part of antennae longer than rostrum ; spine of 

 basal article large, prominent, exposed from above, divergent from 

 the rostrum and much nearer the orbital tubes; a short, acute spine 

 is situated at the antero-external angle and overlaps the preocular 



