5<D CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



L. Uropod 3 biramous; antenna I long 



Dexamine p. 115 



LL. Uropod 3 uniramous; antenna I much 

 shorter than antenna 2 (Orchestiidae). 

 M. Maxilliped with 3-jointed palp; an- 

 tenna i shorter than peduncle of 

 antenna 2. 

 N. Gnathopod I of female subchelate 



Orchestia p. 118 

 NN. Gnathopod I of female simple . . 



Talorchestia p. 122 



MM. Maxilliped with 4-jointed palp; an- 

 tenna i longer than peduncle of 

 antenna 2. 

 N. Gnathopod 2 in male with carpus 



masked by merus Hyale p. 126 



NN. Gnathopod 2 in male with carpus 

 produced between merus and pro- 

 podus. 

 O. Telson undivided ....Hyalella p. 128 



OO. Telson cleft Allorchestes p. 131 



II. Pereiopods I and 2 glandular; coxal plate 4 



not excavate behind. 

 J. Gnathopod i much larger than gnathopod 2 



(Aoridae). 



K. Gnathopod i in male with carpus pro- 

 longed to form a strong thumb-like 



process Microdeutopus p. 133 



KK. Gnathopod i in male with carpus not so 



produced Lembos p. 136 



JJ. Gnathopod i never much larger than gnath- 

 opod 2, usually smaller. 

 K. Uropod 3 biramous. 



L. Kami of uropod 3 not uncinate 



(Photidae). 

 M. Kami of uropod 3 very unequal in 



size Photis p. 139 



MM. Rami of uropods 3 not very un- 

 equal in size. 



N. Antenna i with third joint of pe- 

 duncle shorter than first 



Leptocheirus p. 143 



NN. Antenna i with third joint of pe- 

 duncle longer than first 



Podoceropsis p. 141 



LL. Rami of uropod 3 very short, outer 

 one uncinate. 



