4 BULLETIN OF THE 



Euprognatha rastellifera Stimpson. 



Stimpson, Bull. Mus. Comp. Zobl., IL p. 123, 1870. 



A. M.-EuwAUDS, Crust. Region Mexicaine, p. 183, PI. XXXIII. fig. 2, 1878 ; Bull 



Mus. Comp. Zobl., VIII. p. 7, 1880. 

 Smith, Proc. National Mus., Washington, III. p. 415, 1881. 



This is apparently by far the most abundant of all the Brachyura along our 

 whole eastern coast south of Cape Cod in the belt from 50 to 200 fath. depth, 

 lu the U. S. Fish Commission dredgings off Martha's Vineyard, many thou- 

 sands of specimens were often taken at a single haul of the trawL 



CANCROID A. 



Cancer irroratus Sat. 



Cancer irroratus Sat, Jour. Acad. Nat. Sci. Philadelphia, I. p. 59 (cf only, ? being 

 C. borealis), PI. IV. fig. 2, 1817. 



Stimpson, Ann. Lyceum Nat. Hist. New York, VII. p. 50 (4), 1859. 



Smith, Trans. Conn. Acad., V. p. 38, 1879. 



KiNGSLET, Proc. Acad. Nat. Sci., 1879, p. 391, 1880. 

 Platycarcinus irroratiis M. -Edwards, Hist. Nat. Crust., I. p. 414, 1834. 



DeKat, Nat. Hist. New York, Crust., p. 6 (in part), PI. II. fig. 2, 1844. 

 Cancer Sayi Gould, Invertebrata Massachusetts, 1st ed., p. 323, 1841. 

 Platycarcinus Sayi DeKat, op. cit., p. 7, 1844. 

 Cancer borealis Packard, Memoirs Boston Soc. Nat. Hist., I. p. 303, 1867. 



The occurrence of this abundant shallow- water and littoral northern species 

 in deep water south of Cape Hatteras is very interesting. As a littoral species 

 it is apparently not abundant south of Cape Hatteras, and on the New England 

 coast fully grown individuals are certainly rare below twenty fathoms. The 

 alcoholic specimens from deep water are lighter in color than similar specimens 

 from shallow water, but this may be partially due to the fact that they are 

 entirely devoid of all algoid growths which are common on shallow-water 

 individuals ; and the edges of the carapax appear more acutely dentated, which 

 is easily explained by the fact that they are not subjected to the abrading in- 

 fluence of sand and gravel as the shallow-water specimens are. The following 

 measurements show no appreciable difference from shallow-water specimens in 

 the proportions of the carapax., 



