80W-BI GS AND BEACH } 



! I 



bridges, where sail water has evaporated and become 

 briny. 



Order I. Tetradecapoda. — To this order belong the sow- 

 bugs (Isopoda) and the beach-fleas (Amphipoda). They 

 have do carapace, bul the head is small, bearing two paira 

 of antenna', and a pair of jaws, and three pairs of maxilla'. 



Uut tint 1 



r > 



to. 113.— Naupln 

 /irf.s- stagnalis an/ 1 . Is) an- 

 tenna : .i/ii"-'. 2d antenna; md, 

 in indible; H>, under lip. Much 

 enlarged. 



rimp(ArU 

 Been from above, much enlai 

 eye; ant, I si antennas; ant', 3d anteu- 



• >/, mandibli s 

 foot; ". "\ Isaclc. 



Tin thorax is continuous with the abdomen. They breathe 

 li_\ leaf-like gills, which are situated on the middle feet in 

 the Ajnphipods, or on the hinder abdominal feet in the 

 Isopods. The various species of Porcellio (sow-bug) live 

 under stones on land; and allied to Asellus, Ihe water bow- 

 bug, is the marine Limnoria terebrans, which is very in- 

 jurious to the piles of bridges, wharves, and any submerged 



