400 CIIITONID.E. 



p. 149, f. 24.— Dekay, New York Fauna, Moll. p. 105.— Mid- 



DEND. Malac. Rossic. Chit. p. 117. — Reeve, Conch. Icon. vol. 



iv. Chiton, pi. 26, f. 175. 



Chiton cinercus, 0. Fabr. Fauna Groenl. p. 423 (fide Midd.). — Mat. and 



Rack. Trans. Linn. Soc. vol. viii. pi. 1, f. 3 (probably ; 



not desc). 



„ minimus, Spengler, Skriv. Nat. Selks. Kiobenhag. vol. iv. pt. l,p. 95 



(fide Loven). 

 „ lavis, Loven, Index Moll. Scand. p. 28. 



Of the earlier known and imperfectly characterized 

 species of Chiton this is the one that, from an examina- 

 tion of the Linnean types, we are enabled to identify with 

 the greatest certainty. As a British species, however, it 

 was not distinctly indicated, imtil the publication of Mr. 

 Lowe's admirable paper on this genus, in the Zoological 

 Journal for 1825, although apparently designated in 

 cabinets by the correct appellation, and delineated in all 

 probability in the Linnean Transactions for 1807 as C. 

 cinereus. It is of an oval-oblong shape, only moderately 

 angulated above, not much elevated, and invariably of a 

 dull scarlet, red, or tawny rufous hue, mottled or variegated 

 with white markings, which, in the more characteristic 

 examples are flexuous, linear, and disposed in obliquely 

 longitudinal waves. The posterior edge of the plates is 

 decidedly beaked in the middle, but not much incurved 

 laterally. The surface of the valves, not of the ligamental 

 margin that connects them, is shining, and so smooth as 

 not to exhibit any trace of granules under the most powerfiil 

 lens ; there are, however faint (and in some examples 

 almost obsolete) arched concentric lines of growth, which 

 are generally more apparent at the sides than elsewhere. 

 The lateral areas are tolerably defined by the comparative 

 flattening of their surface, but are not otherwise indicated. 

 The mucrones do not differ in substance from the rest of 

 the shell. The connecting border is broad, so that the 



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