CALLOCHITON. 49 



C. L^VIS Montagu. PI. 9 figs. 95-99. 



Shell oblong, rather elevated and rather acutely carinated, the 

 sides straight or convex. Color very variable, but mainly yellow- 

 ish-olive, spotted and marbled more or less with dark red or reddish, 

 but green often predominating. Girdle olive with creamy spots, 

 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 areas 

 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 14-16 

 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 Icevis 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. discors MATON & RACKETT, Trans. Linn. Soc. viii, p. 20. Chi- 

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

 latus LEACH, I. 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. PL 10, figs. 1-5. 



Shell smooth, entire surface delicately shagreened, terminal valves 

 and lateral areas only with indistinct concentric lines of growth ; 

 4 



