PINNA 



Species 23. (Mus. Cuming.) 



Pinna muricata. Finn, testa trigond, ad latera mbin- 

 ciirvd, pellucido-albd, mbventricosd, obscure costatd, 

 costis squamis triutigularibus 7i.i(ide armald. 



The pkickly Pinna. Shell triangular, rather incurved 

 at the sides, transparent white, somewhat ventricose, 

 obscurely ribbed, ribs neatly armed with triangular 

 scales. 



LiNNJ.us, Syst. Nat. p. 1160. 



Hab. West Indies. 



This, according to Chemnitz and Lamarck, appears to 



be the Linnaean P. muricata. It is of semitransparent 



horny-white substance, neatly scaled, the scales having a 



peculiarly open triangular growth. 



Species 24. (Mus. Cuming.) 



Pinna lueida. Pinn. testa subelongato-Jlabelliformi, lu- 

 rido-corned, tenni, mbventricosd, postice radiatim. li- 

 ratd, m.argine suhincurvd, obscure muricata, anlice con- 

 centrice rugosd, margirie rotimdatd. 



The lurid Pinna. Shell somewhat elongately fan- 

 shaped, lurid-horny, thin, rather ventricose, posteri- 

 orly radiately ridged, margin rather incurved and 

 obscurely prickly, anteriorly concentrically wrinkled, 

 rounded at the margin. 



Ilab. Philippine Islands ; Cuming. 



This approaches very nearly to P. Chemniizii, but the 

 decussated sculpture which is characteristic of that species 



is wanting in the specimen before us. 



May, 1858. 



