298 REPORT OF NEW JERSEY STATE MUSEUM. 



Propodus with distal end produced in long narrow strongly 

 curved process or thumb, which latter armed within on inner side 

 with two teeth. Dactylus long, narrow, strongly curved, and 

 with stiff hairs on inner edge. All other legs ambulatory. Color 

 nearly white. Length 2 mm. (H. Richardson.) 



Retnarks. — This species, though known in North America 

 along the Atlantic coast from New Jersey to Massachusetts, 

 occurs in Europe and Africa, indicating a very wide range of 

 distribution. It lives on the surface, in algas and eel-grass. In 

 New Jersey it has been obtained in Egg Harbor Bay. I have 

 not any New Jersey examples. 



Genus TANAIS Aiidouin and Milne-Edwards. 



Tanais Audouin and Milne-Edwards, Precis d'Entomologie, I, 1829, PI. 29, 

 fig. I. Type Tanais cavolhm Andouin and Milne-Edwards. (Not con- 

 sulted.') 



Crossurus Rathke, Nov. Act. Acad. Caesar Leop. Carol. Nat. Cur., XX, 1843, 

 p. 39. Type Crossurus vittatus Rathke, monotypic. 



Body not much elongated, with cephalosome rather tumid and 

 having distinctly defined ocular lobes. Metasome of only five 

 segments. Eyes well developed. Superior antenn?e of similar 

 structure in both sexes, triarticulate, with very small knob-like 

 terminal flagelhmi. Inferior antennae little smaller than su- 

 perior, flagellum three to four articulate. Mandibles rather 

 strong, molar expansion well developed. Palp of anterior 

 maxillae biarticulate, with several slender setas at tip. Epignath 

 of maxillipeds rather well developed, forms semilunar ciliated 

 plate ending in digitiform lappet. Chelipeds very robust, espe- 

 cially in male, hand of latter much larger than in female, and 

 fingers subforcipate. Second pair of legs slightly differing from 

 succeeding ones, dactylus very much elongated and setiform. 

 Dactyli of other pairs strongly hooked, and in three posterior 



' Tanais is mentioned by Audouin and Milne-Edwards, in Resume d'En- 

 tomologie. I, 1829, pp. 182 (252), though atypic. Later in Iconogr. Ann. 

 Crust., 1829, p. 15, PI. 29, fig. I, it is also mentioned with "Tanias de'Costa" 

 as the monotype. I cannot find any reference to Tanais as given by Agassiz 

 for Ann. Sci. Nat. Zool. Paris, n. XIII, 1828. 



