( ALL. HIM l<>\. H 



C, i BVIS Montagu. I'l. ! figs. !:>-<)9. 



Shell oblong, rather elevated and rather acutely earin;i(ed. tin- 

 Bides Straight Or convex. Color very variable, but niainlv vellow- 

 ish-olive, spotted and marbled more or less with dark rod r n-ddi.-li, 

 but green often predominating. Girdle olive with creamy spot-, 

 and often red patches. 



The valves are slightly beaked and apparently smooth, but under 

 a lens a fine but half-effaced granulation is seen. The lateral areai 

 are distinctly raised. The umbo is low and in front of the center. 



Interior pink-tinted. Anterior insertion plate having 14 to 17 

 slits, median valves with about 3 slits, posterior valve with 14-K> 

 slits. The teeth rise from very spongy eaves, and are more or less 

 thickened at the sides or "propped." Sutural plates continuous, 

 the jugal sinus indicated by a shallow depression. 



Girdle firm, smooth and wide, composed of excessively fine dia- 

 mond-shaped scales. 



Length 21, breadth 11 mill., sometimes larger. 



British Seas; Mediterranean. 



Chiton l(cvis MONTAGU, Test. Brit. p. 2. REEVE, Conch. Icon, 

 f. 125. FORBES & HANLEY, Hist. Brit. Moll. p. 411, t. 58, f. 3. 

 JEFFREYS, Brit. Conch, iii, 226, t. 56, f. 6. Chiton marginatus of 

 some authors. C. achatinus BROWN, Illustr. Conch. Gt. Brit. p. 65, 

 t. 21, f. 4, 12, 13, 15. C. septemvalvis MONT., Test. Brit. p. 3 and 

 C. discprs MATON & RACKETT, Trans. Linn. Soc. viii, p. 20. Chi- 

 on cranchianus LEACH, Moll. G. B. p. 230. Lepidopleurus punctu- 

 latus LEACH, 1. c. p. 228. Chiton dorice CAPELLINI, Journ. de 

 Conchyl. (2), iii, p. 325, t. 12, f. 2, a", b", c", 1859. 



This is a rather high and sharply keeled species although 

 depressed specimens occur. It may be known from other Euro- 

 pean Chitons by the comparative smoothness of both valves and 

 girdle, the latter wide and covered with very fine diamond-shaped 

 scales ; by the propped teeth and spongy eaves, the number of 

 slits in the median valves, etc. 



The Mediterranean form has been called C. dorice, but I am 

 unable to see that it has distinctive characters. 



C. PLATESSA Gould. PI. 10, figs. 1-5. 



Shell smooth, entire surface delicately shagreened, terminal valves 

 and lateral areas only with indistinct concentric lines of growth ; 

 4 



