No. 26.] , ARTHROSTRACA OF CONNECTICUT. 9I 



Gnathopods with propodus not powerful, subchelate. 

 Third uropods with rami subequal, of moderate size. Telson 

 deeply cleft. 



Pontogeneia Boeck. 



Body slender, with none of the segments produced dorsally. 



Antennae slender and elongated, with the first pair a little 

 shorter than the second and without an accessory flagellum; in 

 the males, peduncles with calceoli. 



Gnathopods subequal, feeble; carpus considerably elongated 

 and scarcely expanded below ; propodus narrow, with palm 

 shorter than hind margin. 



Terminal uropods with peduncle short, rami subequal and 

 lanceolate. Telson unarmed and deeply cleft. 



Pontogeneia inermis (Kroyer). 



1838. Amphithoe inermis, Kroyer, Danske Vid.-Selsk. 

 Afhandl. vol. 7, p. 275, pi. 3, fig. ii. 



1893. Pontogeneia inermis, G. O. Sars, Crust. Norway, vol. 

 I, p. 451, pi. 159. 



Body slender and compressed, with back evenly rounded 

 throughout. Rostrum small, interantennal lobes short and 

 obtusely rounded. First three coxal plates rounded quadrangular 

 in form with ventral edge minutely crenulated ; fourth pair con- 

 siderably larger than preceding and produced posteriorly below 

 the emargination to an angular projection. 



Eyes oblong, reniform. 



Antennae in female without calceoli. First pair nearly half as 

 long as body; first joint of peduncle scarcely longer than second 

 but somewhat thicker; last joint half the length of second, and 

 produced below distally to small triangular process ; flagellum 

 twice as long as peduncle and composed of numerous short articu- 

 lations. Second antennae a little longer than the first pair, with 

 the last two joints of peduncle subequal ; flagellum fully twice as 

 long as peduncle. In male, antennae much more fully developed 

 than in female and with last two peduncular joints provided 

 with large calceoli ; flagellum very slender and elongated. 



First gnathopods with propodus shorter than carpus and but 

 very slightly widened distally, palm oblique, scarcely half as long 

 as posterior margin from which it is defined by a very slight angle 



