200 REPORT OF NEW JERSEY STATE MUSEUM. 



and sending off from its end inferiorly an acuminate thumb- 

 like process, propodus narrower than carpus and having pahir 

 imperfectly defined, and large dactylus when closed crossing 

 carpal process. Anterior pairs of perseopoda w^ith basal joint 

 lamellarly expanded, three posterior pairs successively increasing 

 in length, having basal joint oval in form, and dactylus of ante- 

 penultimate pair inverted. Branchial lamellae small, wanting at 

 base of posterior gnathopoda, and incubatory large and broad. 

 Last pair of uropoda with single lamellarly unguiform ramus. 

 Telson short and l)road, with two densely spinous prominences 

 above. 



Several species in the northern and southern hemispheres. 



Ericthonius minax (S. I. Smith). 



Cerapus minax S. I. Smith, Rep. U. S. F. Com., I, 1871-72 (1873), p. 565. 



Long Island Sound and Vineyard Sound. 

 Erichthonius minax Holmes, Amer. Nat., XXXVII, 1903, p. 288. Cape Cod 



to Cape Hatteras region. 



Holmes, Bull. Bur. Fisher., XXIV, 1904 (1905), p. 519, figs. Long 



Island Sound and Great Egg Harbor, New Jersey, to Woods Holl. 



M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, No. 5, 1905, 



p. 74. Long Island Sound. 



Description: — Eyes large, nearly round. Antennae subequal 

 in length, last two joints of peduncle of first pair subequal, 

 and flagellum about long as peduncle. Second antennae rather 

 slender, without many or long setae below, and flagellum nearly 

 long as peduncle. First gnathopods short, large distally widen- 

 ing carpus setose behind, hand smaller than carpus, with nar- 

 rowed base, about two-thirds broad as long, slightly convex 

 palm cut into minute narrowly acute teeth and dactyl acutely 

 serrulate within. Second gnathopods in male very large, merus 

 very small, elongated carpus produced below propodus into very 

 large acute process which has very large tooth on its upper 

 edge. Propodus rather narrow, with low elevation near distal 

 end of margin, and dactyl with long setae at tip. Second 

 gnathopod of female with carpus produced into long lobe ex- 

 tending below propodus far as tip of closed dactyl. Ovate hand 

 with very oblicjue convex palm, armed above with few pairs 



