THE CRUSTACEA OE NEW JERSEY. 215 



much stronger in male than in female, and two basal joints more 

 or less completely coalesced with cephalon. Nb olfactory spine. 

 First pair of maxilte with only slight rudiment of palp. Alaxilli- 

 peds with palp rather short and broad, terminal joint or dactylus 

 quite wanting. Anterior gnathopods simple, not sulxheliform, 

 somewhat stronger in male, and carpal joint elongated and linear 

 in form. Posterior gnathopoda in both sexes of similar structure, 

 rather feeble and almost bare, terminating with an imperfectly 

 cheliform hand, dactylus being quite rudimentary. Branchial 

 lamelhie very small. Incubatory lamellae likewise small, lance- 

 olate, with only few marginal set?e. Telson rather broad, 

 rounded at tip. 



Species few, distinguished from Orchestia chiefly by the an- 

 terior simple gnathopoda, the posterior ones exactly alike in 

 both sexes, and the less compressed body. The American species 

 all belong to the subgenus TalorcJiestia, which is defined by Dana 

 as having the first pair of gnathopods of the male as in Talitrns, 

 though the female has them furnished with a very small hand, 

 the latter absent in the female of Talitrus. Provisionally I have 

 allowed Talitrus to s"upersede Tal orchestia. 



Key to the species. 



a. Eye moderate ; second antennas in male about long as body ; hand of 

 second gnathopods in male oblong, palm with large lobe near middle and 

 large prominence at hind end. longicornis 



aa. Eye very large; second antennje in male about one-third long as body; 

 hand of second gnathopods of male subovate, distally widened, palm 

 evenly convex with no lobe near middle, hut defined posteriorly with 

 prominence. mcgalophthalmtis 



Talitrus longicornis Say. 

 Plates 63, and 150, Figure 8. 



Talitrus longicornis Say, Journ. Acad. Nat. Sci. Phila., I, pt. 2, 1818, p. 384. 



The seabeach of Nezv Jersey. 

 Orchestia longicornis DeKay, N. Y. Fauna, Crust., VI, 1844. P- 36. PI. 9, figs. 



28-283 (5). Long Island shores. 

 White. Cat. Crust. Brit. Mus., XXV, 1847. p. S6. New Jersey (Say's 



material). 

 Bate, Cat. Amp. Crust. Brit. Mus.. 1862, p. 18, PI. 3, fig. i (Say's 



example). 



