294 



PTEROPODA. 



The Northern Clio (Clio lorealis), an animal not 

 more than an inch in length (Fig. 235), but of truly 

 marvellous structure. On each side of the mouth 

 are three conical appendages that to a superficial 

 observer appear to be mere fleshy tentacula, but in 

 reality they are instruments of prehension of un- 

 paralleled beauty and astonishing construction. Each 

 of these six appendages when examined with the 

 naked eye is of a reddish tint; but when examined 

 under the microscope this colour is found to be 



FlG. 235. CYMBULIA AND CLIO. 



dependent upon the presence of numerous minute 

 isolated red specks, every one of which, when still 

 more highly magnified, is found to be a transparent 

 cylinder resembling the cell of a sertularia, and 

 containing within its cavity about twenty suckers 

 adapted to seize and hold minute prey : the number 

 of these red specks is calculated to be about three 

 thousand; so that there are at least (3000x20x6) 



