No. 26.] ARTHROSTRACA OF CONNECTICUT. 147 



First and second pereiopods glandular. Third pereiopods re- 

 verted. Fifth pair the longest. 



Third uropods with short rami, the outer one of which is 

 uncinate. Telson simple. 



Amphithoe Leach. 



Body slender, compressed, coxal plates of moderate size. 



First antennae without accessory flagellum. 



Lower lip with outer plates incised at tip. Mandibles very- 

 strong; palp comparatively short, with terminal joint large and 

 expanded and setose distally and on inner margin. First maxillae 

 with inner plate small and with a single seta. Second maxillae 

 with outer lobe much larger, than inner. Maxillipeds with moder- 

 ately short palp. 



Gnathopods subchelate. First two pereiopods glandular. 

 Posterior pereiopods increasing successively in length with pro- 

 podus simple. 



Last pair of uropods with peduncle massive; rami subequal 

 in length, the outer one lamellar and armed with two unguiform 

 spines, the inner one conical in form. Telson of moderate size 

 with a small projection on either side of the tip. 



Amphithoe longimana Smith. 



1874. Amphithoe longimana, Smith, Rept. U. S. Com. Fish., 

 1871-2, p. 563. 



Body slender. Eyes round and, in life, red. 



First antennae slender and as long as body; second joint of 

 peduncle longer than first and nearly twice as long as third; 

 flagellum about twice as long as peduncle. Second antennae 

 stouter than first, especially in male, and somewhat shorter; 

 peduncle much elongated, last joint considerably longer than 

 preceding one and about as long as flagellum. 



First five coxal plates much deeper than their segments; the 

 first one prolonged in front; the three following plates oblong. 



First gnathopods in male unusually elongated; carpus long 

 and narrow with setae on hind margin; propodus three times 

 as long as wide and as long as carpus but hardly as broad, palm 

 short and transverse, posterior margin slightly -concave and 

 covered densely with setae; dactyl large and projecting well be- 



