226 



magis minusve tuhulosis instructis : costarum interstitiis latis, 

 concavis : area ventrali angusta, sublcevigata, plicis transversis 

 aut nullis aut obsoletis : margine dorsafi subrecto : margine 

 ventrali sinuoso, ad extremitateni paululum pendido : margine 

 postico obtuse subtruncato, in/erne (scilicet marginem ventral em 

 versus) magis prominente. 

 Long. 3|, lat. 8 poll. 

 Hab. Carolina, Amer. Sept. 

 Mus. Hanley, Cuming. 



The projection of the ventral extremity of the posterior margin 

 gives an oblique aspect to this coarse-looking shell, which has erro- 

 neously been taken for P. seminuda by the American conchologists : 

 it is, however, much narrower, and more sparingly ribbed. I may 

 here remark, that the Pinna usually forwarded to us by our North 

 American friends as P. muricata, is the P. squamosissima of Phi- 

 lippi. 



2. Pinna hystrix. P. testa tenui, late cuneiformi, carina 

 centralis experte, subinflata, postice subquadrata, cornea, livido- 

 purpurascente partimfucata, costulis multis instruct a ; costidis 

 squamis semitubulosis longis erectis confertim horridis (alternis, 

 autem, nonnumquam muticis) ; interstitiis latis, planoconcavis, 

 et lamellis incrementi conspicuis arete ornatis : area ventrali 

 lata, scabra : margine postico subtruncato : margine ventrali 

 postice margini dorsali subrecto fere parallelo et cequali, an- 



trorsum abrupte concavo. 

 Long. 6, lat. 4 poll. 

 Hab. Amboyna. 

 Mus. Cuming, Hanley. 



A very beautiful shell, and remarkable, when young, for the ex- 

 quisite shagreening of the very broad ventral triangle. 



3. Pinna Kraussii. P. testa tenui, lanceolata, cornea, fusco- 

 purpurascente picta, carina centrali obsoleta, et costulis, quee 

 squamis fornicatis erectis longis sunt armatce, instructa : in- 

 terstitiis vix latis, plano-subconcavis : area ventrali angusta 

 sublcevigata, minime scabra : margine dorsali incurvato et mar- 

 gine ventrali subrecto subcequalibus : margine postico brevi, 

 subtruncato. 



Long. 4, lat. 2 poll. 



Hab. Natal (teste Sowerby). 



Mus. Hanley, Hamilton. 



From the locality, I should have suspected this might have been 

 the lost Afra of Sowerby : but that celebrated conchologist gave me 

 the species as unknown to him. Moreover the ribs are not subob- 

 solete, the scales loose, scattered and broadish, or the hinder margin 

 roundish, as required by the description. The painting of my own 

 young specimen is composed of brownish liver-coloured irregular 

 linear markings, the armed ribs are nine or ten, but incipient cos- 

 tellse are manifest in their intervals, which are consequently less 

 broad than in the preceding species. 



