2o8 REPORT OF NEW JERSEY STATE MUSEUM. 



ones, palp comparatively small and dactyliis very minute. An- 

 terior gnathopoda extremely slender and attenuated, monodac- 

 tylous. Posterior gnathopoda shorter and stouter than anterior, 

 not subcheliform. Perseopoda comparatively strong, basal joint 

 of three posterior pairs moderately expanded, more or less pro- 

 duced at infero-posteal corner. Last pair of uropoda with 

 inner ramus longer than outer. Telson oblong-oval in form, 

 with apical incision rather narrow. 



Species about four. The only one assigned to this genus,, 

 from our limits, is here allowed on the suggestion of Bate. 



Acanthonotozoma sayi (Bate). 



Acanthonotus sayi Bate. Cat. Amph. Crust. Brit. Mus., 1862, p. 128 (name 



based on Say) . 

 A)iipithoe serrata (nee Oniscus serratus Fabricius 1792) Say, Journ. Acad. 



Nat. Sci. Phila., I, 1818, p. 383. Egg Harbor, New Jersey. 

 Amphithoe serrata De Kay, N. Y. Fauna, Crust., VI, 1844, p. 38 (on Say). 



Description. — Rostrum acute. Eyes large, black, oval, placed 

 at outer base of first antennae, and approximated above. An- 

 tennae equal, short and stout, reach base of sixth segment of 

 body. Hands with about three equidistant prominent spinose 

 teeth on inferior edge of palm, nail or thumb curved, acute and 

 reaching third tooth. Eight, ninth and tenth segments of body 

 serrated, last more conspicuously so. Length two-fifths of an 

 inch. (Say.) 



Remarks. — Only known from Say's account. He adds further 

 on that the species is remarkable for its large eyes, short and 

 stout antennae, and serrated appearance of hind part of back, 

 occasioned by elevation of tip of each of those segments above 

 the base of the succeeding one. The species has not been redis- 

 covered since Say's time, when it was secured in Great Egg 

 Harbor. 



Fomily ORCHESTHD^. 



Body rather tumid, more or less compressed, metasome and 

 urosome comparatively short and stout. Coxal plates rather 

 large, fourth pair not emarginated posteriorly, and fifth pair 



