THE SPIDER CRABS OF AMERICA 



555 



KEY TO THE AMERICAN SPECIES OF THE GENUS HETEROCRYPTA 



A'. Branchial ridge terminating at a point inside lateral angle of carapace. 



B'. Postero-lateral margin straight or nearly so between terminus of branchial 



ridge and lateral angle of carapace granulata, p. 555. 



B-. Postero-lateral margin concave between terminus of branchial ridge and 

 lateral angle of carapace. 

 C Carapace wide, at least one and one-fourth times as wide as long. 



macrobrachia, p. 558. 

 C-. Carapace narrower, one and one-eighth times as wide as long. 



lapidea, p. 559. 

 A^. Branchial ridge terminating at lateral angle of carapace. occid entails, p. 559. 



Analogous species on opposite sides of the continent: lapidea 

 (Atlantic) ; macrohrachia (Pacific) . 



HETEROCRYPTA GRANULATA (Gibbes) 



PENTAGON CRAB 

 Plate 203, figs. 1 and 2; plate 282, figs. 1-3 



Cryptopodia granulata Gibbes, in George White, Statistics Georgia, Savannah, 

 1849, p. 21 {nomen nvdum); Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, 

 p. 173 [9] (type-localities, near Kiawah Island, SuHivans Island, and 

 White Point Shoal, Charleston Harbor, South Carolina; a type-specimen 

 from Sullivans Island and another from Charleston Harbor, 1850, are in 

 the University of South Carolina at Columbia); Proc. Elliott Soc, vol. 1, 

 1856, p. 35, wood-cut. 



Heterocrypta granulata Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 

 1871, p. 102.— A. Milne Edwards, Crust. R6g. Mex., 1878, p. 166, pi. 29, 

 figs. 4-4c. 



Bia^jnosis. — Carapace nearly one and 

 one-half times as wide as long, margins 

 crenulate. Postero-lateral margin be- 

 tween branchial ridge and lateral angle 

 straight. Branchial ridges united by 

 gastric ridge. 



Description. — Carapace very wide, 

 length two-thirds the width; the branchial 

 ridge runs almost parallel to antero-lateral 

 margin, except on gastric region, where it 

 is transverse; from either end of this trans- 

 verse portion a longitudinal crest runs for- 

 ward to upper margin of orbit. A large 

 domelike elevation on cardiac region, 

 granulated at summit. General surface 

 smooth and punctate; margins crenulate. 

 Portion of margin between antero-lateral 

 margin and the branchial ridge straight. 

 The posterior margin forms with the preceding an angle scarcely 

 perceptible except in a rear view. Rostrum broad, blunt, and de- 

 flexed, margins rounded. Lower surface is granulous. Merus of 



Fig. 152.— Heterocrypta granulata 

 (8485), maxilliped, x 14.6 



