THE CANCROID CRABS OF AMERICA 21 



arm. Tooth at distal inner angle of meriis of outer maxilliped longer 

 than broad. 



Chelipeds rather large; distal three-fifths of anterior margin of 

 meriis with several small spines and a dense fringe of hair; carpus 

 with two spines the inner one very long; hand triangular in section, 

 external border costate, internal border wath an overhanging densely 

 ciliated ridge which ends distally in a sharp spine; external costa and 

 internal line of cilia continued on the dactyl. Fingers about as long 

 as palm, tapering very gradually, tips turned abruptly toward each 

 other. Abdomen of male narrow, sides nearly parallel; sixth segment 

 nearh^ twice as long as seventh measured on the median line ; seventh 

 segment subcircular. Abdomen of adult female suboval and small 

 compared to the sternum. 



Color. — Yellowish gray, closely set w^th small annular spots of 

 reddish purple; carapace and chelipeds with a silvery or brassy irides- 

 cence. (Hay and Shore.) Ground color of chelipeds and legs light 

 brownish tending to orange and bluish; large irregular bluish purple 

 spots on upper surface of chelipeds; large part of wrist including spine 

 bluish; similar but lighter spots on proximal half of other legs; 

 paddles greenish j^ellow, with deep yellow rim. 



Measurements. — Male (32448), length of carapace 55.2, width of 

 same 69.2; fronto-orbital width 29.4, width of front, between tips of 

 spines 10.2 mm. 



Range. — Minas Basin at Bass River, Nova Scotia (Leim). From 

 Provincetown, Cape Cod, Massachusetts, to South Carolina. In sand 

 at low-water mark and off shore to 10 fathoms. 



Material examined. — 



MASSACHUSETTS. — Provincetown; swimming in schools at sur- 

 face by laboratory dock about 9. a. m.; August 16, 1879; U. S. 

 Fish Comm.; many very young (3888). 



Provincetown; shore, sand; September 3, 1879; U. S. Fish Comm.; 

 22 young (3887); undoubted^ the same brood as the preceding. 



Provincetown; 1899; J. E. Benedict; 1 male, 1 female (29320). 



Muskeget Channel; surface; August 12, 1887; U. S. Fish Comm.; 

 10 specimens (12791). 



Woods Hole; U. S. Fish Comm.: 1882; 4 males, 4 females (4894). 

 Low water; 1883; 1 exuvia of female (5803). Low water; 1883; 

 1 young with its exuvia, August S (6392). 1885; 1 male and exuvia, 

 moulted September 2 (36969). Nobska beach; July 20, 1892; 

 V. N. Edwards; 9 young (26185). Vicinity of Woods Hole; 1911; 

 1 male, 3 females (32.448), 1 specimen (43186). Surface, by electric 

 light; September 5; 4 males, 3 females (40710). Low water; 1 male, 

 moulted; September 5 (36970). 



Vineyard Sound; U. S. Fish Comm.: 1871; 1 young (34926). 

 1875; 24 very small to medium (2557). Surface; July 31, 1882; 



