14 



BULLETIN OF THE 



Breadth of carapax in front 

 Length of eye-stalks 

 Greatest diameter of eye 

 Length of right cheliped 



" carpus 



" chela 

 Breadth of chela 

 Length of dactylus . 



" left cheliped 



" carpus 



" chela . 

 Breadth of chela 

 Length of dactylus 



" first ambulatory leg, right side 



" propodus 



" dactylus 



" second ambulatory leg, right side 



" propodus 



" dactylus 



6.5 mm. 8.6 mm. 11.0mm. 



4.7 

 2.7 



30.0 

 7.3 



12.0 

 5.8 

 6.1 



25.0 

 6.1 

 9.2 

 4.0 

 5.8 



36.0 

 7.6 



11.5 



38.0 

 8.8 



13.0 



Station. 

 309 

 310 

 336 



N. Lat. 

 40° 11' 40" 

 39° 59' 16" 

 38° 21' 50" 



W. Long. 

 68° 22' 0" 

 70° 18' 30" 

 73° 32' 0" 



6.2 

 3.5 



40.0 



11.3 



16.0 



8.3 



9.1 



37.0 



10.0 



13.5 



5.8 



8.8 



54.0 

 12.0 

 17.0 



Fathoms. 

 304 

 260 

 197 



7.8 

 4.1 

 56.0 

 14.5 

 22.7 

 11.0 

 11.9 

 48.0 

 12.0 

 17.5 

 7.5 

 11.2 

 67.0 

 14.5 

 22.0 

 73.0 

 16.0 

 23.0 



Specimens. 

 3 

 2 

 5 



It has also been taken, and in great abundance, by the U. S. Fish Commis- 

 sion, off Martha's Vineyard and oft" the Capes of the Delaware, in 65 to 365 

 fathoms, and is the species which I have referred to, in Proc. National Mus., 

 Washington, IIL p. 428, 1881, as " Euvagurus, sp." 



CATAPAGURUS A. M.-Edwards. 



Catapagurus A. M.-Edwards, Bull. Mus. Comp. Zool., VIII. p. 46, 1880 (Dec. 29). 

 Hemipagurus Smith, Ann. Mag. N"at. Hist., 5th ser., VII. p. 143, Feb. 1881 ; Proc. 

 National Mus., Washington, III. p. 422, 1881. 



I have no doubt that my genus is synonymous with that of Milne-Edwards 

 as indicated above, but I am quite unable to tell from the description alone 

 whether one of my species is synonymous with the single species, C. Sharreri, 

 described by Milne-Edwards. C. Sharreri agrees more nearly in size with 

 H. socialis than H. gracilis, but will very likely prove to be distinct from 

 either, and until this can be determined satisfactorily, it seems best to refer 

 both my species to Catapagurus. 



The genus differs from Spiropagurus Stimpson in the form and position of 

 the sexual appendage (formed by the permanent extrusion of a portion of the 



