INVERTEBRATE FAUNA OF SOUTH CAROLINA. 295 



ORDER AMPHIPODA 



[Seven pairs of legs. Eyes sessile. Membraneous vesicles for breathing organs. 

 Body frequently compressed.] 



Amphitlue dentata Say. 



Gammarus mucronatus Say. Gammarus fosciatus Say. 



Talorchestia longicornis Smith (commonly known as Beach-flea, and Sand-hopper.) 



ORDER ISOPODA. 



[Seven pairs of legs. Eyes sessile. Gills for breathing organs. Body usually de- 

 pressed] 



Armadillidium pilularis Say [Pill-hug.) 



Asellus communis Say. Asellus lineatus Say. 



Conilera concharum Hargr. 



Idottea cteca Say. 



Livoneca ovalis Say [Fish-louse.) 



Lygia gaudichaudii M. Edw. ( Wharf-louse ) 



Nesfea caudata Say. 



Nerocilla variabilis Gibbes. 



Porcellio (probably several species; on land only; commonly known as sow bugs and 



pill bugs.) 

 Sphteroma quadridentata Say. 



ORDER L^MODIPODA. 



[Posterior segments of body provided with legs. Eyes sessile. Breathing by 

 vesicles. All marine.] 



Caprella equilibra Say. Caprella geometrica Say. 



EATOMOSTRACA. 



[This group includes several orders of cru.staceans, which have mostly a horny or 

 chitinous shell. Most species are minute, and many live in fresh water.] 



Cyclops naviculus Say. 

 Cypris sp. 



