No. 26.] AETHROSTRACA OF CONNECTICUT. I47 



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 antennje 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 maxillag 

 with inner plate small, and with a single seta. Second maxillse 

 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- 



