180 



2. 



Ingens. Pinna ingens. Br. Zool. No.Sl. —Lijier Conch, t.372. f, 213 ? 



P. with a very rugged fliell, with irregular, concentric 

 wrinkles, running lengthways from the beak at the open 

 fide, and turning to the hinge nearly at right angles ; fome. 

 times breaking into laminae or plates : from the beak run 

 a few interrupted ftrias, which crofTing the wrinkles, fome- 

 limes form on the broader part of the fliell, a few diilant 

 concave fpines : but thefe muil; be confidered as varieties, 

 for in general it is deflitute of any inclination to be echi- 

 nated. In the fpined variety it is obfervable, that the 

 flria;, or ribs from which the prickles arife, are never 

 above feven or eight, remote from each other; thefe fpines 

 however, are only found on very young fiiells. With 

 age it is fubjeft to be much diflorted, and is indented 

 in various parts, as well as on the margin : but the mofl 

 perfeft, and regular grown fhells, are nearly ftrait from the 

 beak along the hinge, turning a little inwards at the apex : 

 on the oppofite fide, under the beak, it is concave or in- 

 dented; beneath which it fwells out, and increafes gradu- 

 ally to the larger end, and is always longer on that Cde 

 than on the other: the larger end is a little rounded, but 

 is more angular next the hinge. Large and old fliells are 

 of a dark, and rather opaque horn-colour: fmaller ones 

 paler and more diaphanous: all more or lefs of a change- 

 able green, at the fmaller end. Infide fmooth, gloffy, and 

 of a pearly hue; laminated at the beak : valves connetled 



the Vi'liolc lentjth. 



Th 



IS 



