CONCHIFERA. 



247 



PaN0P2EA. Menard, — Shell equivalve, oblong, trans- 

 verse, more or less inequilateral, 

 unequally gaping at both ends ; 

 one conical tooth in each valve, 

 with a thick callosity on the 

 side; ligament external; pallial 

 impression deep, having a large 

 sinus. Animal, oblong, and 

 furnished with a very long and 

 extensible siphonal tube ; body and tube invested with a 

 wrinkled brown leathery epidermis, continuous with the 

 shell ; mantle closed throughout its length, except a small 

 opening with thickened lips in front anteally, for the 

 passage of a short muscular foot ; adductor muscles very 

 strong ; mouth surrounded by thickened lips, bearing four 

 labial palpi ; siphonal tubes united to their extremities ; ori- 

 fices inconspicuously fimbriated.* — Few species; also fossil. 



This is a large handsome shell ; but it is not often found 

 perfect in collections. Very large specimens are shown in 

 Chenu's workf, nine and a half inches from side to side, 

 and six from the boss to the edge; this species is P. 

 Aldrovandi ; P. Faujasii is not quite so large. Specimens 

 of P. Norvegica are occasionally found at Scarborough, 

 where the fishermen make the valves into " 'bacca boxes. "J 

 They are dug out of the sand, where they bury themselves 

 several feet deep. 



Pholadomia. Sow. — Shell thin, transparent, white 

 or yellowish, the inside pearly, 

 transverse and oval, inequilate- 

 ral, and slightly gaping at both 

 ends ; hinge having a long nar- 

 row hollow Or pit and a pro- Pholadomia Candida. 



* Forbes' s British Moll. f Illus. Conch. | Mag. of Nat. Hist. 



R 4 



