A.MPHIPODA AND IS0P0DA OF THE FIRTH OF CLYDE. 89 



To try how long* the adult animal could live sub- 

 merged, I put half a dozen, together with two 

 amphipods, into a glass vessel, covering them to a 

 depth of an inch with sea-water. On the third day 

 one of them was dead, bat all the others seemed to 

 be in good condition ; on the eighth day one or two 

 of them looked feeble ; on the tenth day three of 

 the Li (/ice and one of the amphipods were dead ; on 

 the twelfth day the other amphipod was dead; and 

 on the fifteenth day they had all succumbed. As 

 the dead had not been removed, or the water 

 changed, these circumstances may have hastened 

 their death ; but whatever the cause of death may 

 have been, it is evident that they can live for a 

 considerable time under water. The one that died 

 on the third day may have been injured in being 

 captured ; and the want of proper food to sustain 

 life may have been the chief cause of the others 

 not surviving longer. Neither the dead nor the 

 living amphipods were touched, but some of the 

 dead Ligice were lying in pieces — whether from 

 decay or the work of their companions I could 

 not decide. As the amphipods and Ligia oeeanica 

 live numerously together under stones, it can 

 scarcely be suspected that they prey on each 

 other. From further experiments I should say 

 that they do not seem to touch their dead neigh- 

 bours or brethren. 



They do not live so long in fresh water, but the 

 length of time depends much on the character of 

 the water. In hard water one lived three hours 

 and another four hours, and in rain-water two 

 lived eight hours and another twenty-four hours. 



Sub-family ONISCIN^E. 

 Genus Philoscta, Latreille. 



PHILOSCIA MUSCORUM, Scopoli. 



Oniscus museorum, Scopoli, Entom. Carniol., p. 1145. 

 Philoseia museorum, Latreille, Hist. Crust, et Ins., 

 vii., p. 43. 



