568 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



with a geniculation at the articulation of the fourth with the fifth seg- 

 ment; terminal portion, corresponding to the flagellurn, composed of 

 three closely articulated segments, besides a minute apical one; mandi- 

 bles slender, without palpi ; exposed portion of the niaxillipeds formed 

 of only two segments ; the basal one with a narrow, elongated portion, 

 which is abruptly narrowed at the articulation of the terminal segment, 

 and sends a slender process beneath it to the middle of its inner margin j 

 the terminal segment much narrower tlian the basal, and tapering 

 toward the extremity; legs subequal, the posterior not shorter than 

 the others ; terminal segment of the abdomen produced between the 

 posterior caudal appendages, which are short aud essentially as in the 

 allied genera. 



This genus differs from Scyphax most notably in tbe form of the niax- 

 illipeds, which in Scyphax have the terminal segment broad and serrately 

 lobed, while in our genus it is elongated, tapering, and has entire mar- 

 gins. In Scyphax, also, the posterior pair of thoracic legs are much 

 smaller than the others, and weak ; the last segment of the abdomen is 

 truncated at the apex, and the articulations between the segments of 

 the terminal portion of the antenna? are much more complete than in our 

 species. The general form and appearance of the genera are the same,, 

 and the known species agree remarkably in habits, th*e Scyphax, accord- 

 ing to Dana, occurring on the beach of Parua Harbor, New Zealand, 

 and found in the sand by turning it over for the depth of a few inches. 



SCYPKACELLA arenicola Smith, sp. nov. (p. 337.) 



Body elliptical; abdomen not abruptly narrower than the thorax; the 

 whole dorsal surface, except the extremity of the abdomen, covered with 

 small, depressed tubercles, which give rise to minute spinules; eyes 

 prominent, round ; antenna a little longer than the breadth of the body ; 

 first and second segments short, equal ; third, fourth, and fifth succes- 

 sively longer, the fifth being rather longer than the terminal portion, 

 which is more slender than the fifth segment, tapers regularly to the 

 tip, and is composed of three successively much shorter segments, and 

 a very short, somewhat spiniform, but obtuse, terminal one; all the seg- 

 ments, except the minute terminal one, scatteringly beset with spinules; 

 legs beset with small spines ; the ischial, meral, carpal, and propodal 

 segments subequal; terminal process of the last segment of the abdo- 

 men narrow, triangular, with the apex slightly rounded, and the dorsal 

 ' surface a little concave; posterior caudal appendages much shorter than 

 the abdomen; rami slightly unequal, the outer stout, spinulose, the inner 

 a little shorter and much more slender. 



Color, in life, nearly white, with chalky white spots and scattered, 

 blackish dots arranged irregularly. Eyes black. 



Length, 3-4 mm . 



Found at Somers's and Beesley's Points, on Great Egg Harbor, New 

 Jersey, in April, 1871, burrowing in the sand of the beaches, just above 



