114 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuH. 



Second antennae with flagellum equal to last two joints of 

 peduncle, of about ten segments. 



First four coxal plates deep; first three oblong; fourth wide. 



First gnathopods in male stout, smaller than second ; carpus 

 less than half as long as propodus which is narrowly oval, palm 

 uneven, very oblique and continuous with posterior margin ; 

 propodus of second pair oblong, with the two sides nearly paral- 

 lel and the palm oblique and concave near the middle. 



Fig. 29. Carinogammarus mucronatus. 



Posterior margins of first three abdominal segments pro- 

 duced backward in the mid-dorsal line into a prominent acute 

 tooth; last three segments with fascicles of spines. 



Third uropods with flattened rami much longer than peduncle ; 

 outer one biarticulate and larger than inner one and provided on 

 margins and apex with setae and spines. Telson cleft nearly to 

 base, and provided with three terminal and a few lateral spines 

 on each lobe. 



