98 Descriptions of British Chitones and other Shells. 



Valvuli medii dentibus 4 utrinque, primo majore. 

 Valvulus 1™"' dentibus 20, parvis. 



Icon. Tab. nost. V. f. 1.— Penn. Brit. Zool. 4. t. 36. f. 3; Ed. 

 1812. pi. 39. f. 3. (fide Linn. Trans, and Turton). — Leach's 

 Brit. Moll. ined. pi. X. f. 7 (opttme). 



Linn. Gmel. p. 3206 (fide Linn. Trans).— Mont. Test. Brit, 

 p. 2.— Linn. Trans. VIIL p. 21. No. 5.— Wood's Gen. Conch, 

 p. 22.— Turton's Conch. Diet. p. 33. 



var ? Co septemvahis, Mont. Test. Brit. p. 3. (C. discors of 

 Linn. Trans.) 



Shell raised, elevated, rather convex, keeled. Valves slightly 

 beaked, to the naked eye smooth, shining, polished, with irre- 

 gular strias of growth. When seen through the lens they are 

 found to be distinctly and regularly, but very minutely granu- 

 lated ; the granulations disposed in quincunxes. Margin very 

 broad, expanded, finely and regularly reticulated ; the meshes 

 of the reticulations raised and shining. Fringe very short, in- 

 distinct. Colour fine deep red, or rufous brown ; sometimes 

 mottled with green, and often decorticated and encrusted. Margin 

 often with alternate stripes or patches of red and white. Fringe 

 deep red. Length from one quarter to three quarters of an inch. 

 Breadth half the length. 



Found at Oban, adhering to rocks at Spring tides. Rather 

 rare. 



It was not without much hesitation that I was at length induced 

 to consider this shell as the C. Icevis of authors. I am now how- 

 ever clearly of opinion that the granulations of the valves, from 

 their minuteness, escaped the observation of the accurate author 

 of the Test. Brit, and other writers. This decision is satisfacto- 

 rily confirmed by the inspection of specimens in the collection of 

 the Cambridge Philosophical Society, named, as I am informed 

 by Professor Hen slow, by Mr. Lyon of Tenby. 



If C. punctatus of Turton's Conch. Diet. p. 34. f. 10. be really 

 punctured^ it must be distinct from this species ; and cannot be 

 the obscure C. punctatus of Linnaeus, p. 1107. No. 6, which also 

 is described ^' punctis excavatis," since the figure in Seba referred 



