72 



There ;ire also a great variety of Crabs, diffei'eiit sortts of wlii<-li are seen in tlie tanks from 

 time to time. Tlie little blue CVab, which is found in such (quantities on the sand when the tide is 

 out, is a verv favorite food with all the tish. so as soon as it is placed in the water it is (j^uickly 

 gobbled u]i. 



PE]{()N'M IBi^CUS CRAB. 



[Jlmct/s l^i-roiiii.) 



This sjieeies is rather uncommon, 

 but is found in I'oi't I'liillip and 

 Western Port. 



ECHINODERMATA. 



To this family belong the Sea-urchins, Starfish, &e.; the uumerous spikes of tlie Sea- 

 urchin and the under surface of the Starfish are provided with suckers, by which they attach 

 themselves to the rocks or other objects; an opportunity can generally be got of observing 

 their structure minutely, as some of the sj)eciniens will generally lie found attached to the glass 

 of the tanks in which they are ke])t. 



