PINNA 



Species 47. (Mus. Cuming.) 



Pinna Japonica. Plhh. testa mlitngono-Jlabellatd, tenui, 

 ItBviyatd, olivaceo-cinered, latere posiico radiatim li- 

 rato, llris mhirregidaribus, anlico concentrice subtiUter 

 riigoso, margine postico sparsim squamato. 



The Japan Pinna. Shell somewhat triangularly fan- 

 shaped, thin, smooth, olive-ash, posterior side radi- 

 ately ridged, ridges rather irregular, anterior side 

 concentrically finely rugose, posterior margin sparsely 

 scaled. 



Hanley, Pro. Zool. Soc. 185S. 



Ha6. Japan. 



This has very much the appearance of a young shell. 



It is of a semitransparent horny substance, distinctly 



rayed with flattened ridges on the posterior side, and 



faintly concentrically rugose on the anterior. 



Species 48. (Mus. Cuming.) 



Pinna tuberculosa. Finn, testa subrottmdato-trigond, 

 fusco-nigricante, squamulis pallidioribiis obsolete sub- 

 radiata, squamulis foliaceis, breaibus, postice incurvis, 

 fornicalis, tubercula simnlantibus. 



The tubercled Pinna. Shell somewhat rotundately 

 triangular, fuscous-black, obsoletely rayed with scales 

 of a paler colour, scales foliaceous, short, posteriorly 

 curved inwards, vaulted, resembling tubercles. 



SowERBY, Pro. Zool. Soc. 1S35, p. 84. 



Hab. Panama (obtained from muddy banks) ; ('uming. 



Chiefly distinguished by the peculiarity of its scales, 

 which are short and vaulted, extremely irregular, and of a 

 yellowish-white hue upon a rusty-black ground. 



August, 1858. 



