THE CRUSTACEA, OF NEW JERSEY. 319 



Family CRANGONID^. 



Carapace short, rostrum short, not laterally compressed. 

 Basal joint of antennular peduncle slightly concave dorsally, and 

 with scale or spine on its outer border. Two short antennular 

 flagella. Antennal scale usually foliaceous. Mandibles slender, 

 incurved, not deeply cleft into divaricating incisor and molar 

 branches, without palp. Second maxillae have coxa and basis, 

 and first maxillipeds coxa, much reduced. All maxillipeds have 

 exopodites terminating in slender flagella. Terminal segment of 

 second maxillipeds a narrow plate attached along all its extent to 

 inner border of propodite, as if complemental piece of latter. 

 External maxillipeds stout, pediform. First pair of thoracic legs 

 much stoutest, subchelate, dactylus closing on oblique distal 

 border of hand, fixed finger on oblique spine. Second pair of legs 

 with simple carpus, usually slender and chelate, sometimes not 

 chelate and sometimes wanting. Third pair much slenderer than 

 fourth and fifth. First pair of thoracic legs alone sometimes 

 have an exopodite. 



Genus CRAGO Lamarck. 



The Sand Shrimps. 



Crago Lamarck, An. San. Vert., 1818, p. 150. Type Cancer crangon Linnaeus, 



monotypic. 

 Crangon (nee Weber 1795) Fabricius, Suppl. Entomol. Syst., 1798, p. 409. 



Type Crangon vulgaris Fabricius, second species, designated by Kingsley, 



Proc. Acad. Nat. Sci. Phila., 1879, p. 411. 

 Steiracrangon Kinahan, Proc. Roy. Irish Acad. Dublin, VIII, 1862, p. 68. 



Type Crangon {Steiracrangon) allmanni Kinahan, monotypic. 



Rostrum very short. Eyes free. Antennulae biflagellate. Ex- 

 ternal maxillipeds pediform. First pair of perreopoda stout, 

 stouter than second, though but little longer than latter. Second 

 pair slender, elongate, chelate, and remaining pairs acuminate. 

 Hand subchelate, dactylus closing on margin of palm and pollex 

 being spiniform. Branchiae five on each side. 



