SB SHELLS, Class VI. 



Incarnata. Lin. Syft. 1 1 1 8. No. 58. Faun. Suec. No. 2.1 33. Lift. Angl. 

 31. Carna- App. tab. l.fig.S. 



TIOK. 



T. oblong, deprefled ; originally covered with a 

 thick brown epidermis. When naked, of a whitifh 

 color rayed with red, and crofTed again with mi- 

 nute concentric ftri<s. 



Ufual breadth, one inch and three quarters. 



Tab. xlvii. fig. 31. 



Carnaria. Lin. Sjfi. 1 119. No. 66. Lift. Angl. tab. iv. fig. 25. 



32. Flesh- 

 colored. 



T. with a ftrong and rounded fhell, generally of 

 a bloom color within and without •, externally mark- 

 ed with belts of deeper red. 



Breadth about feven-eighths of an inch. 



Sometimes found quite white, as fig. 32. A. 



Tab. xlix.fig. 32. 



Trifiafdata. Lin. Syft. I I 1 9. No. 58. 



33. Tri- 



fasciated. 



T. with a very brittle fhell, radiated like the 

 T. Incarnata \ but lefler. 



Rugcfa. T. with oval fhells, marked with rugged ccncen- 



34.RUGGED. t fcjfag m This has much the habit of the My- 

 tihis Lithcphagus. 



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