PINNA. 



Plate XXII. 



Species J-l. (Mus. Cuming.) 



I'iNNA ATRO-PUKPUREA. I'iiiii. testd Ingono-JlobellaUl, 

 subobliqud, radiatim liratd, liris Irtvibtts, regularibus, 

 IMere antico muiico ; atro-purpured. 

 The dakk-purplb Pinna. Shell triangularly fan- 

 shaped, rather obliiiue, radiately ridged, ridges 

 smooth, regular, anterior side not ridged ; dark 

 purple. 

 SowERBY, Tankcrvillc Catalogue, Appendix, p. 5. no. 



531 fl. 

 Hab. Araboyua. 



Tliis species is well characterized by the peculiar regu- 

 larity of its ridged sculpture, and by its dark purple co- 



Species 42. (Mus. Cuming.) 

 Pinna pectinata. Finn, testd trigond, subventricosd, ra- 

 diatim liratd, liris subcoutortis, sparsim squamalis, 

 latere antico rugoso et muricato-squanwso ; semipdlu- 

 ; cido-olivaced. 



I The pectinated Pinna. Shell triangular, rather ven- 

 tricose, radiately ridged, ridges somewhat twisted, 

 sparingly squaraate, anterior side rough and prickly 

 scaled ; seraitransparent-olive. 

 LiNN^us, Syst. Nat. p. 1160. 

 Pimm inflata, Chemnitz. 

 Hab. Britain. 



In many examples of this species the anterior side is 

 curiously blistered. The shell is rather light and ventri- 

 cose, and of somewhat irregular growth. 



