I2C CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Fifth pair of pereiopods of adult males with merus and carpus 

 greatly swollen. 



Rami of lirst uropods considerably shorter than peduncle; 

 second pair with rami subequal to peduncle ; third pair with ramus 

 much more slender than peduncle and nearly as long. Telson 

 narrowly rounded behind. 



The color of this species is very variable from olive brown 

 and dark green to whitish. The legs, coxal plates, and posterior 

 portions of the body are bluish, and the antennae are reddish or 

 reddish brown. 



Length lO mm. 



Distribution : Atlantic coast of North America from the Bay 

 of Fundy to New Jersey; Bermuda; the Mediterranean; New 

 Haven, Connecticut ; Long Island Sound. 



This species is exceedingly abundant under seaweed near high- 

 water mark but not so high on the beach as Talorchestia longi- 

 cornis. It is usually at least a few inches beneath the surface 

 where the weeds are damp, and when masses of seaweed are up- 

 turned, the air fairly swarms with these animals, which hop about 

 with great rapidity and to relatively great distances. It is by far 

 the most active of the sand fleas. It also burrows in the sand 

 and is occasionally found on piles at some distance from shore. 

 It feeds mainly on decaying seaweed but also partakes of animal 

 food. 



Although the species is generally found on shore, it is able 

 to swim actively. It is strongly attracted by a light and large 

 numbers may be obtained by placing a lantern on the beach 

 along side of a vessel of sea water or alcohol and simply stirring 

 up the seaweed within a radius of several yards. The animals 

 hop towards the light and when they fall into the water they are 

 unable to crawl up the smooth sides of a bucket or glass dish. 



Holmes gives a full account in the American Journal of 

 Physiology, vol. 5, p. 211, of the phototaxis of this species which 



may be negative under certain conditions. 



« 



Orchestia palustris Smith. 



1874. Orchestia palustris, Smith, Rep. Com. Fish, for 1871-2, 

 P- 555- 



First antennas reaching slightly beyond penultimate joint of 

 peduncle of second antennae; fiagellum as long as peduncle. 



