PYCNOGONIDA OF NEW ENGLAND AND ADJACENT WATERS. 493 



measured are, in all but one or two cases, from tlie second leg of the 

 right side. 



a (N. brevitarse) 



b 



c 



d {N. grosslpes) . 



e 



/ 



g 



h {Tf. mixtum) . . 



Ratio of 

 t. to p. 



0.54 



0.65 



0.72 



1.00 



1.20 



1.25 



1.315 



1. 541 



In PI. VI, figs. 33 to 35, the variation of the neck is shown. All the 

 latter specimens are adult males. 



This and the preceding species are the commonest of the group. The 

 most southerly locality from which I have seen specimens is Long Is- 

 land Sound (two young specimens, 50 fathoms, off Eace Point Eock, 

 1874); and the most northerly is Orphan Bank in the Gulf of St. 

 Lawrence, dredged by Mr. Whiteaves in 1873 ; Dr. Packard has re- 

 corded it from Labrador. Taken by the United States Fish Commission 

 off Salem and Gloucester, 19 to 48 fathoms ; Gulf of Maine, off Cape 

 Ann, 18 to 90 fathoms ; off Isles of Shoals; off Cashe's Ledge ; off Cape 

 Elizabeth; Casco Bay, common; St. George's Banks, 50 fathoms; com- 

 mon off Halifax, IG to 101 fathoms ; Bedford Basin, Halifax Harbor, 35 

 fathoms, soft, oozy, offensive black mud. In depth the observed range 

 js from 12 to 110 fathoms. Like the preceding species, it is found upon 

 nearly all bottoms, but it seems to be less of a muddy bottom species, 

 and is more often taken on rocky or gravelly bottoms. 



It seems to me not improbable that Leach's Nymplion gracile is identi- 

 cal with J\r. grossipes, though none of the descriptions and figures of that 

 species, which I have seen, suffice to identify it with certainty. The 

 species of N'ymplionfTom Northern Europe are in considerable confusion, 

 and stand in need of revision. 



Specimens examined. 



