370 REPORT OF NEW JERSEY STATE MUSEUM. 



first, or first and second, abdominal segments of male, and first 

 abdominal segment of female, carry pair of appendages modified, 

 for sexual purposes. Telson usually more developed on left side 

 than on right, as also caudal appendages or uropods. Gills as 

 phyllol^ranchiie or trichobranchice, or intermediate between them. 



Sub-Faiiiily Pagurin.^. 



External maxillipeds widely se]>arated at base. Right cheliped 

 usually vastly longer than left and latter never larger than right, 

 though occasionally subequal. 



Genus PAGURUS Fabricius. 



The Hermit Crabs. 



Pagurus Fabricius, Suppl. Entomol. Sj'st., 1798, p. 411. Type Cancer berii- 



hardus LiniiEeus, third species, designated as example by Latreille, Hist. 



Nat. Crust., 1802, pp. 29, 30. 

 Bupagurus Brandt, Sibir. Reise Middendorfif, Z06I., Pt. I. 1851, p. 105. 



Type Cancer bernhardus Linnjeus, designated by Stimpson, Proc. Acad. 



Nat. Sci. Phila., 1858, p. 236. 

 Bernhardus Dana, Proc. Acad. Nat. Sci. Phila., 1852, p. 6. Type Pagurus 



bernhardus Linnaeus, virtually designated. 



Carapace elongate, broadened posteriorly, well calcified in front 

 of cervical groove. Rostrum either distinct or obsolescent. Ab- 

 domen well developed, soft, spirally coiled. Eyestalks either stout 

 or slender, ophthalmic scales usually distant. Antennal acicle 

 long and flagellum long, nude or more or less setose. External 

 maxillipeds wddely separated at base. Exopodites of all three 

 pairs of maxillipeds flagellate. Endopodite (palp) of first maxil- 

 lae without flagellum, though sometimes a rudiment. Qielipeds 

 usually dissimilar and unequal, rig'ht much larger, very rarely 

 subequal, and fingers move in more or less horizontal plane, 

 finger-tips calcareous, rarely corneous. Fourth pair of legs sub- 

 cheliform, fifth pair minutely or imperfectly cheliform with short 

 blunt fingers, and in both pairs (as also on uropods) usual sub- 

 terminal pavement of imbricating granules. Abdominal ap- 

 pendages, in addition to those forming tail-fan, four (somites 



