Class VI. PINNA. NACRE. 243 



GENUS XVIIL PINNA. NJCRE. 



Animal, a Slug. 



Shell fragile, furnished with a beard; gapes 



at one end. 

 Hinge without a tooth. 



Lin. Syst. I16O. Gm. Lin. Moni. Test. Br. I78. 1. pecti- 



3364. P. fragilis. Br. Zool iv. 1 14. nata. 



Lin. Tr. viii. 113. . . _ . 



P. with a very thin semi-pellucid whitish shelly 

 most opake near to the apex. Marked on the 

 surface with longitudinal slender ribs, rough- 

 ened with concave scales ; and the whole tra- 

 versed by innumerable fine strice. In young 

 shells the ribs and scales are almost obsolete. 

 The valves of lesser transverse diameter. The 

 largest about five inches and a half long ; and 

 three and a quarter broad in the broadest part. 

 The figure is of a broader specimen than usual. 

 Dredged up at JVey mouth. From the Port- 

 land cabinet. Tab, Ixxii. 



Iritile, 



R2 



