PINNA 



Plate XXVI. 



Species 49. (Miis. Cuming.) 



PlNN.i D'Orbignyi. Finn, tesfd subangusti irigond, ven- 

 tricosa, pellncido-comed, radiatim squamald, squamis 

 versus nmrginem spatMMis, prominentibuK, varie ior- 

 tiiosk. 



D'Orbigny's Pinna. Shell somewhat narrowly triangu- 

 lar, ventricose, transparent-horny, radiately scaled, 

 scales towards the margin spathulatc, prominent, 

 variously twisted. 



Hanley, Pro. Zool. Soc. 1858. 



Hab. West Indies. 



The scales of this species are characteristic. They be- 

 come gradually enlarged towards the margin, spathulate 

 and variously twisted, fiist on one side, then on the other. 



Species 50. (Mus. Cuming.) 



Pinna rugosa. Finn, trsta magna, nidi, irigond, versus 

 umbones contractd, longitudinaliter obtuse radiatim 

 costatd, cosiis versus marginem squamiferis, squamis 

 magnis, elongatis, irregularibns, subrecurms, foliaceis, 

 hibulosis. 



TuE ROUGH Pinna. Shell large, rude, triangular, con- 

 tracted towards the umboes, longitudinally, obtusely, 

 radiately ribbed, ribs full of scales towards the mar- 

 gin, scales large, elongated, irregular, somewhat re- 

 curved, foliaceous, tubular. 



SowERBY, Pro. Zool. Soc. 1835, p. 84. 



Ilai. Isle of Eey, Bay of Panama (from sand-hanks) ; 

 Cuming. 

 This interesting species, remarkable for the bold, folia- 



ceons, tubular growth of its scales, is sometimes a foot 



and a half in length. 



August, 1858. 



