88 



SEA-SHORE LIFE 



feeding they could be rendered more palatable for market than 

 Avhen subsisting upon their natural diet. At present the fishery is 

 worth not more than $2500 per annum. 



An admirable description of the anatomy of the crayfish is 

 given by T. H. Huxley in "A Manual of the Anatomy of Inverte- 



brated Animals," 1891, p. 264; 

 and also in the International 

 Scientific Series, "The Cray- 

 fish," 1880. 



In the neighborhood of 

 New York w^e find three com- 

 mon species. In Cantharus 

 bartonii, Fig. DO, the body is 

 devoid of spines, but is pitted 

 with little depressions scat- 

 tered at fairly regular inter- 

 vals. It is very abundant in 

 running streams, and often 

 hides away under stones or 

 burrows into gravel. Large 

 specimens may be three inches 

 in length. 



In Cainharushlandingii the 

 body and claws are besprinkled with tubercles. It is dull greenish- 

 brown, whitish beneath and lives in clear, running streams; often 

 resting near the surface upon water plants, with its head pointed 

 up stream. It grows to be over five inches in length. 



Camhams affinis is the crayfish which is commonly sold in the 

 New York markets. It grows to be a little over four inches long, 

 and the upper surface is mottled with darker and lighter shades of 

 green, while the tips of the nipijers are orange. The under sur- 

 face is streaked with chestnut-brown It is common in the rocky 

 beds of rivers, and often rests under flat stones, but avoids dense 

 clusters of water plants. 



SHRIMPS AND PRAWNS 



These are generally smaller than the lobsters and crayfishes. 

 Moreover, they are swimming creatures while lobsters and cray- 



Fig. ss; BROOK CRAYFISH. Orange 

 Mountains, New .Jersey. 



