No. 26.] ARTHROSTRACA OF CONNECTICUT. 253 



It can be distinguished from other terrestrial forms by the 

 short uropods which do not project behind the telson which is 

 truncate. 



SCYPHACID^. 



Head without median or antero-lateral lobes. Front not 

 margined but continuous with the epistome. 



Second pair of antennas with flagellum composed of four 

 joints. 



Mandibles without molar tubercle. First maxillae with inner 

 lobe furnished with two plumose setae ; outer lobe furnished with 

 teeth. Maxillipeds with masticatory lobe acutely produced; palp 

 elongate. 



Abdomen not abruptly contracted. Uropods extending beyond 

 tip of abdomen; inner ramus inserted at upper inner margin of 

 peduncle. 



Scyphacella arenicola Smith. 



1874. Scyphacella arenicola, Smith, Rept. U. S. Com. Fish, 

 for 187 1-2, p. 568'. 



1880. Scyphacella arenicola, Harger, ibid., for 1878, p. 307, 

 pi. I, fig. 2. 



1905. Scyphacella arenicola, Richardson, Bull. U. S. Nat. 

 Mus., No. 54, p. 671. 



As I have not met with this species myself I quote Professor 

 Smith's original description: 



" 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 successively 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 segments, 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 abdomen narrow, triangular, with the apex 



