PINNA. 



Plate IV. 



Species 6. (Fig. a, b, Mus. Curaing.) 

 Pinna saccata. Pitiu. testa irregulariter trigond, nunc 

 oblongd nunc lalinsculd, semper plus minus distortd, 

 radiatim costatd, costis amplis, obtusk, uudatis, inler- 

 dum nodatis, latere antico sape sinu coarctato ; suc- 

 cineo-rufescenie, corned. 

 The satchel-shaped Pinna. Shell irregularly trian- 

 gular, sometimes oblong, sometimes rather broad, 

 always more or less distorted, radiately ribbed, 

 ribs large, obtuse, waved, sometimes noduled, an- 



terior side often contracted by a sinus ; amber-red, 



horny. 

 LiNN^us, Syst. Nat. p. llfiO. 

 Var. elongata, P. Nultallii ; Conrad. 

 Hab. Sandwich Islands and Philippine Islands ; Cuming. 

 There is no defining the varieties of this very character- 

 istic species. It has a wide range of habitation, and is 

 found distorted into all sorts of forms between those se- 

 lected for illustration. Its araber-red horny substance is 

 quite peculiar. 



March, 1858. 



