546 KEPORT OT^OMMISSIONER OF FISH AND FISHERIES. 



Island, will very likely be fouud rarely upou the beaches at Nantucket, 

 and on the southern j)art of Cape Cod. It lives in deep burrows, above 

 the reach of tides, upon sandy beaches. It is readily distinguished from 

 the "fiddlers" by the nearly equal'claws or hands, which are alike in 

 both sexes, and by its color, which is almost exactly like the sand upon 

 which it lives. It is carnivorous and very active, running with great 

 rapidity when pursued. 



The synonymy of this species is in much confusion, and I have not 

 attempted to rectify it here, although there are apparently several 

 names which antedate that of ISay. The Brazilian species, usually 

 called rhomhea appears to be identical with ours, and if it is really the 

 rhombea of Fabricius, his name should undoubtedly be retained. 



•Sesaema reticulata Say. (p. 4G7.) 



Journal Acad. Nat. Sci., Philadelphia, vol. i, pp. 73, 76, PL 4, fig. 6, 1817 ; p. 442, 

 1818 ; Smith, Trans. Conn. Acad., vol. ii, p. 156. 



From Long Island Sound to Florida, usually upon, salt marshes and 

 associated with Gelasimtis pugnax. 



PiNNiXA CYLiNDRiCA Say. Plate I, fig. 1. (p. 3G7.) 



Journal Acad. Nat. Sci., Philadelphia, vol. i, p. 452, 1818. 



Yiueyard Sound and Long Island Sound to South Carolina. 

 Pinnotheres ostreum Say. Plate I, fig. 2, male. (p. 3G7.) 



Loc. cit., p. 67, PI. 4, fig. 5, 1817 ; DeKay, op. cit., p. 12, PL 7, fig. 16. 



Massachusetts to South Carolina. 

 Pinnotheres maculatus Say. (p. 434.) 



Loc. cit. p. 450, 1818. 



It lives in Mytilus eduUs on the Xew England coast, and is found from 

 Cape Cod to South Carolina. 



Cancer irroratus Say. (pp. 312, 530.) 



Loc. cit., p. 59, PL 4, fig. 2, 1817 ; Stimpson, Annals Lyceum Nat. Hist., New York, 

 vol. vii, p. 50, 1859. Plati/carcinns irroratus Edwards, Hist. uat. des Crust., tome 

 i, p. 414, 1834 ; DeKay, op. cit., PL 2, fig. 2. Cancer Sayi Gould, Report on the 

 Invertebrata of Massachusetts, 1st edit., p. 323, 1841. riafycarcinus Sayi DeKay, 

 op. cit., p. 7. Cancer horealis Packard, Memoii'S Boston Nat. Hist. Soc, vol. i, 

 p. 303, 1867. 



Labrador to South Carolina. 

 Cancer borealis Stimpson. (pp. 486, 493.) 



Loc. cit., p. 50, 1859. Cancer irroratus Gould, op. cit., j). 322. 

 Nova Scotia to Vineyard Sound and No Man's Land. It very likely 

 occurs both north and south of these limits, as it seems to be rare or 

 local, and is often, perhaps, confounded with the far more common C. 

 Irroratus, although it is a perfectly distinct species. 



