HNOCHIT' [00 



each valve. The umbo of the posterior val^ ml ami : 



eratrly elevate. I. 



Interior white ; >utm-al plates raiftll, --p:iratrd id*-, 



flat siim-. Anirrii-r valve lia\in-_ r !". po-in i..r valve Ml 

 tral valves 1 slit ; teeth .-harp; eftVei narrow, .-hurl, -olid. 



( ;irdle covered with rl. -mall, Btl ialulale, in 



scales. Length !"), breadth * mill. 



.!/- dit( i i-'ini'tin and A<> r> 



chiton rtwot I'AVI:.. Moll. Cone, p. 87, t. 



PiMi.irn, Knum. Moll. Sicil. i. p. 107. C\ri i IIM, .I.iiru. <! 

 Conchyl. (2) iii, p. '^2'2 (1S")J)). Issr.i., Intonio ai Chiton dd mare 

 di (Jonova, in P>iill<'ttim MalacologlCO Italiano, iii. p. .", t. 1, t 

 (1870). MOFTBBOSATO, Journ. de Conchyl. 1*7\ p. 117. I. 

 I)\i T/.. .\: DOLLF., Moll. Mar. Rouss. p. 495, L 81, t'. 10, 11, 12; t. 

 tt'2. t'. 2. r/t. mriH't/hinii. CAPKLLINI, Joimi. dc Conchyl. (*2) iii, p. 

 325, t. 12, f. 1. Ck. inediterraneu* "Gray MS.," I; >nch, 



Icon. t. 23, f. ir>7 (1847). 



This species is well characterized by its flat close concentric rib- 

 lets and the sparsely scattered snowy spots on the end valves and 

 lateral areas. The sculpture of the lateral areas is irregular and 

 variable, the riblets being ragged-edged and occasionally sul> 

 lete, leaving the raised areas almost smooth. The C. />o/ii Phil, is 

 readily distinguished from this species by its difft-ivntly formal 

 posterior insertion teeth ; in ri**oi the posterior teeth are normally 

 Ischnoid. 



The Ch. mediterraneux of Reeve is simply a synonym of the typi- 

 cal form of this species. The form which Reeve calls risso 

 Icon. t. 19, fig. 122) is a synonym of the variety meneghinO. 



V&r.meneghinii Capellini (pi. 20, figs. 8-10). Sculpture stronger, 

 the end valves and lateral areas exhibiting distinct radiating stria-. 



Var. frayill* Monts. (Enum. e Sinon.). Smaller in si/t\ the 

 sculpture obsolete, without trace of radiating stria-. 



I. PERTUSUS Reeve. PL 20, figs. 18, 1 !>. 



Shell oblong-ovate, valves elevated in the middle, very cl 

 grooved throughout, ridges of the central areas thin, nm\vr_ 

 towards the umhones, interstitial grooves pricked, posterior edge of 

 the valve serrated ; dark red, sprinkled with a tew minute white 

 dots; ligament horny, very sparingly b'.M-t \\ith short hri.-tli->. 



