48 



Animal Life by the Sea-shore. 



taken to an almost terrestrial existence, yet keeping to the imme- 

 diate vicinity of the sea ; but the closely related Gamniarus 

 (Fig. 52) is entirely aquatic, although often found under stones 



FIG. 52. GAMMARUS LOCUSTA (AFTER SARS). 



on the wet beach, its peculiar way of wrigghng along on the 

 side accounting for the popular name, " scud," often applied 

 to it. Other types are to be found in tufts of seaweeds, and 

 among them the extraordinary skeleton shrimps, Phtisica and 

 Caprella (Fig. 53), representatives of another family of 

 Amphipods. With their slender, elongate body, long antennae and 

 walking-legs, they are the stick-insects of Crustaceans, and their 

 tenuity renders them almost invisible when clambering among 

 the delicately branched seaweeds and zoophj'tes. As adaptations 

 to a terrestrial existence, the sand-hoppers are even surpassed 

 by some of the Isopoda, resembling the Amphipods in their 



FIG. 53. — CAPRELLA LINEARIS (AFTER SPENCE BATE). 



sessile eyes and ringed body, which is, however, depressed instead 

 of compressed ; the seven pairs of walking-legs are similar to 

 one another, at least in the tA'pical forms. The Sea-slater 



