PINNA. 331 



Pinna lubrica. Solander's MSS. 



Pinna, No. 3. Schroeter Einl. iii. p. 486. 



Gualter, t. 78. f. C. 

 Inhabits the East Indian Seas. Chemnitz. 

 Shell about four inches long, and rather more than an inch and 



a half broad, very brittle, thin, transparent, shining, and of a 



very pale horn colour ; the form is somewhat triangular, with 



the base rounded ; it has about sixteen longitudinal ribs, and 



is rather regularly wrinkled transversely. 



papyracea. 17. Shell pellucid, with ten longitu- 

 dinal somewhat scaly ribs. 



Pinna papyracea. Chemnitz, viii. p. 283. t. 93. f. 786. 



Gmelin, p. 3367. 

 Pinna tenera. Solander's MSS. 

 Pinna, No. 10. Schroeter Einl. iii. p. 489. 



Inhabits the East Indian Seas. Chemnitz. 



This shell is allied to P. vitrea, from which it may be dis- 

 tinguished by its fewer ribs, and by the transverse scaly 

 wrinkles being confined to the ribs, and not extended regu- 

 larly throughout the whole breadth of the shell ; it is of a 

 horn colour, with a brownish violeit spot in the middle. 



saccata. 18. Shell sub-triangular, satchel-shaped, 

 with a few longitudinal unarmed ribs, and 

 transverse wrinkles ; base truncated. 



Pinna saccata. Linnaus Syst. Nat. p. 11 60. Chemnitz, 

 viii. p.^3 1 . t. 90. f. 779- Schroeter Einl. iii. t. 9. f. 17. ? 

 Gmelin, p. 3365. Leach Zool. Misc. i. p. 130. t. 57. 

 Lister Conch, t. 371. f. 212. Rumphius, t. 46. f. N. Pe- 

 tiver Amb. t. 19- f. 7. 

 Inhabits the Mediterranean and Indian Ocean. Linnmts. 

 The specimen which Chemnitz has described, measured six 

 inches and three-quarters long, and four inches and five lines 

 broad, and Schroeter describes his to have been shorter and 

 much narrower in proportion. According to Linnaeus, the 

 colour is either white, violet, or reddish brown ; and Dr. 

 Leach says, " this rare species is readily distinguished by its 

 irregular distorted form : some specimens are ribbed from 

 the base to the point, and others only anteriorly." 



digitiformis. 19. Shell smooth, tubular, finger- 

 shaped, incurved, and the margin membrana- 

 ceous. 



