OUU CAUCINOLoaiCAL FRIENDS. 93 



shell occupied by it. In the more common form 

 of the small hIicUs (Eupoffurus longkarpus), which 

 raroly aituiiis a length much exceeding one inch, 

 Uio legs are all much elongated, giving the animal 

 a very sicnder appearance. 



SHIUMPS AND PRAWNS. 



Of the long-tailed ten-footed crustaceans (Ma- 

 crura) the best-known representatives are the lob- 

 ster, shrimp, and prawn. The first, which is too 

 familiar to require special notice, can scarcely bo 

 considered to be a true member of the New Jersey 

 couflt fauna, having been introduced with the build- 

 ing of the Delaware breakwater, where it has se- 

 cured somewhat of a permanent footing. Its rarity 

 otherwise must be attributed to the absence of an 

 environment suited to its living and development. 

 The rocky shores of the North cotiKtitute its true 

 home, and although stray individuals are found 

 farlher south, they rarely appear below the East 

 River. The species sometimes attains an enormous 

 size, individuals frequently weighing as much as 

 fifteen to twenty pounds, and occasionally passing 

 much beyond this limit. An animal somewhat re- 

 sombliiijij the lobster, although considerably smaller 

 in size — measuring only tlirco or four inches in 

 length — is the Gehia affinis (PI. 6, Fig. 6), a pro- 

 found burrowor of the nuid-flats. 



The shrimps and prawns, which much resemble 

 one another, are abundant in the bays and harbors, 

 passing up to considerable distances in the tidal 

 st roams and crocks. They are active little creatures, 



