THE CRUSTACEA OF NEW JERSEY. 313 



Genus PEN/CUS Fabricius. 



The Bdible Prazvns. 



Penaus Fabricius, Ent. Syst. Suppl, 1798, p. 409. Type Penceiis monodon 



Fabricius, first species, evidently designated by Stebbing, Hist. Recent 



Crust. (Int. Sci. Series LXXIV), 1893, p. 216. 

 P'eneus, auct. 

 Xiphopemeus S. I. Smith, Trans. Conn. Acad., II, 1870, p. 27. Type Xipho- 



peneus harttii S. I. Smith, monotypic. 

 ParapencEus S. I. Smith, Proc. U. S. Nat. Mus., 1885, p. 170. Type Penceus 



longirostris Lucas, first species. 

 Parapeneus, auct. 

 MetapencEiis Wood-Mason and Alcock, Ann. Mag. Nat. Hist., London, (6) 



VIII, 1891, p. 271. Type PencEUs aMnis Milne-Edwards, designated. 

 MetapeneuSj auct. 

 Parapeneopsis (Wood-Mason) Alcock, Cat. Crust. Ind. Mus., 1901, p. 14. 



Type PencEus styliferus Milne-Edwards, designated, monotypic. 

 Trachypenens Alcock, 1. c, p. 15. Type Pencsus anclioralis Bate, designated, 



monotypic. 

 Neopenwopsis Bouvier, Compt. Rend. Acad. Sci. Paris, CXLI, 1905, p. 747. 



Type NeopencEOpsis paradoxis Bouvier, designated, monotypic. 



Carapace with well developed rostrum, which may be toothed 

 dorsally and ventrally or dorsally only. Abdomen long, some 

 of hind somites compressed and carinated. Eyes large, sub- 

 globular. Basal joint of antennule hollowed dorsally for recep- 

 tion of eye, its outer edge produced anteriorly into a spine, and 

 from proximal end of inner edge springs conspicuous twisted 

 setose scale. Antennular flagella cylindrical, commonly sub- 

 equal and either short or not very long (one occasionallv much 

 elongated in Xiphopenens). Antennal scale large, outer edge 

 rigid and anteriorly acute. Antennal flagellum long. Man- 

 dibular palp large and broadly foliaceus, second joint vastly 

 larger than first. Palp of first maxillae comimonly ends in little 

 distinctly articulated flagellum. Exopodite of external maxilli- 

 peds compressed stiffish joint, long as and similar to that of 

 second maxillipeds. External maxillipeds pediform. First three 

 pairs of thoracic legs chelate, first pair shortest and third pair 

 longest. Last two pairs of legs monodactylous. Exopodites 

 usually present on all, or all but last thoracic legs, or sometimes 



