No. 26.] 



ARTHROSTRACA OF CONNECTICUT. 



123 



setse; fifth, sixth, and seventh plates decreasing in size posteriorly. 

 First three abdominal segments with postero-lateral corners rec- 

 tangular or slightly acute. 



Fig. 33. Talorchestia longicornis. 



First gnathopods in male with carpus produced at postero- 

 distal angle to form a long, rounded lobe; propodus shorter than 

 carpus, widening somewhat distally and with postero-distal angle 

 slightly rounded and produced and covered with dense spines, 

 palm transverse and short. Second gnathopods of male with pro- 

 podus large and oval with anterior margin rounded and posterior 

 one nearly straight, palm oblique, defined by a blunt tooth, be- 

 tween which and the hinge is a convex lobe provided with setae. 

 In female the first gnathopods resemble those of male but the 

 carpus lacks the rounded process and the propodus tapers distally 

 so that there is no distinct palm. Second gnathopods weak, basal 



