272 POPULAR HISTORY OF THE AQUARIUM. 



Pecten OPERCULARIS. 



The Common Fainted Scallop is an object of great beautv. 

 Not ouly its shell is finely painted (either variegated with 

 red, brown, and white markings), but the fringed and bril- 

 liantly coloured mantle lining the shell, and showing itself 

 as the animal lies with his valves a little gaping. Near 

 the edge of this mantle are a great number of thread-like 

 tentacles, capable of contraction and expansion ; and be- 

 tween these are seen a number of minute circular points, 

 generally believed to be eyes, looking very much like theni, 

 aiid well placed for use in that capacity. The Pecten ad- 

 heres to surfaces by means of a byssus of small threads 

 which it throws out between its valves on the upper side ; 

 and when placed in a jar will attach itself to the glass 

 at the sides; here it will hang with its two half-circles 

 of eyes apparently on the watch. At times however it 

 will move about by means of leaps effected by blowing 

 out jets of water suddenly from between the edges of the 

 mantle. 



Philline quadripartita. — (Plate X. fig. 45.) 

 When this Mollusc is crawling, it presents the appear- 



