ROUND THE INDIAN MUSEUM. 107 



shells which they either manufacture or secrete for 

 themselves. Here then are two good examples showing 

 how the manner of living may modify structure. 



" The next series comprises animals with segmented 

 bodies and jointed limbs which the Zoologists have de- 

 signated arthropoda. But as we have already considered 

 them somewhat in detail, let us proceed with the 

 inspection of a most singular group of animals exhi- 

 bited in these wall cases. As most of the animals 

 of this group have spiny skins, the Zoologists, wha 

 delight, in the same manner as Indian Pundits 

 like our Vidyabhushan, in high sounding names, 

 call them." 



ECHINODEEMATA. 



" The name is no doubt very suggestive of the pecu- 

 liar outward characteristic of all these animals, as 

 in simple Queen's English it means an animal with 

 hedgehog-like skin, from (EMnos, a hedgehog which 

 has a spiny body, and derma skin). 



" They are marine animals usually of the shape of a 

 five-rayed star and covered with a skin which is 

 always thick and stout and is often so impregnated with 

 lime salts as to form a rigid stony case. For further 

 protection, the hard stony integument is often thickly 

 covered with short spines. 



" The animals of this group are of a higher organiza- 



ion than any of those we have hitherto seen and studied. 



The proof of this lies in the following facts ; (a) They 



