227 



4. Pinna minax. P. testa rotundato-trigona, lata, crossing- 

 eula, prorsus atro-purpuraseente, eubventricoso, costisdepi 

 rotundatis squamiferis arete itutrueta ,• squamis fornieatis 

 (etiam marginem ventratem juxta) magnis patulis reflexis con- 

 fertis tt transversim subjunctis undique armata .■ carina cen- 

 trali nulla : margine dorsali 8itbreeto, aliquantulum breviore 

 marffine ventrali />ostice subarcuato, antice abrupte coneavo . 

 margine postico latisaimo, rotundato, in/erne eminentiore. 

 Long. 5£, lat. 7 poll. 

 I lab. Nov. Guinea ? Mexico ? 

 Mus. II an ley. 



The precise locality is very uncertain, the specimen (the only one 

 I have seen) having heen purchased without trustworthy authority 

 upon that point. The scales, of which there are about eighteen 

 rows on the ribs (which latter become nearly obsolete posteriorly), 

 cover, the entire surface, and hecome smaller and still more crowded 

 near the lower margin, which they face, leaving manifest traces of 

 their presence where abraded. The general shape and aspect is 

 that of P. nigra. 



"». Pinna fu.mata. P. testa lanceolata, subventricosa, in medio 

 obtuse carinata, cornea, griseo-nigrescente subradiatim nebu- 

 losa ; antrorsum costellata, striolisque lamellaribus transversa 

 arete decussata ; eostellis depresses, hand remotis . area ven- 

 trali angusta, inconspicua, subUevigata, rugis increment/ sub- 

 pliciformibus obsofetis : margine dorsali et ventrali subrectis, 

 subcequalibus : margine postico brevi, subtruncato. 



Long. 10|, lat. 41 poll. 



llab. Insular Philippine. 



Mns. Cuming, Ilanlcy. 



The dorsal margin is barely the longer, and, except at the extiv 

 uiity, scarcely concave. 



('». Pinna regia. P. testa trigona, hand angusta, satis cvn- 

 vexa, carina centrali obtusa infirmata, eorneo et purpureor lives- 

 eente transversim undulata, radiatim costata ; costispaucis{cir 

 citer 8), depressis, rotundatis, remotis, et squamis patulis laxit 

 subremotis armatis: area ventrali angusta . margine dorsali et 

 ventrali subrectis, subaqualibus: extremitate postica convexo 

 - subtruncata. 



Lone. ;}.',, lat. 7j poll. 



Hub. Amboyna. 



Mus. Cuming. 



The ribs extend to nearly tin- ventral margin, adjacent t" which 

 are only indistinct folds of increase. 



7. Pinna ROSTBU.UM. /'. testa lanceolata, 

 purpurascente nebulosa, carina centrali subobtusa infirmata, nn 



tier sul em east at a (ens/ is cirri/, r B) el lineis inCOUSpi 



versim rugosa ; postice squamis paucis laxis patulis in ! 



