DM ll\n< IN I 

 The nil-die U reddish-brown. eoveivd with minute elon-at. 'I 



The gills extend I'onvard to tin- middle of tin- body. 



Lciiirth 20, breadth 12 mill. Al:i.-k:m BpeCUE 

 Ii iiLi'th of an inch. 



Arctic <IH<! north* rn xeas of Europe; south t<> M 



\. 1'iiciiir <in<l Ilt'i-hiy* Sea from I'rih iloff Is. went to Alia, xoittlt to 

 N/7/-</ ; l\nmrhntk<t. Low water to 80 fins. 



Chiton nihrr L., S\>t. Nat. xii, j>. 1 1 <7. L>\\ i:, Zool. Journ. ii. 

 p. 101, t. 5, f. 2. (Jon, i), Invert. Mass. p. 1 111, f. '_' 1 : edit. IJiimey 

 p. 1M50, f. 523. FORHKS& HANI.KY, IIi>t. Mull. (i. I;, ii, ; 

 59, f. 6; t. AA, f. 6. HANLKY, Sh. ,,f Linn. p. 17. SoWEBBTj 

 Coiu-h. Illnstr. f. 103, 104. RKKVE, Conch. Icon. f. 175. JEF- 

 i IM.YS, Brit. Conch, iii, p. 224 ; v, p. 19!), t. M>, f. 4. Ch. cinereus 

 ( ). F.vi;u., I-'uiin. Clronl. p. 423, not of authors nor of Lin IK'. Ch. 

 minimum SIM-:N<JL., not of Gmel. Ch. fan's L<>VI;N, Ind. M.dl. lit. 

 Scand. p. 28, 1846, not of Mont., Forbes & Hanley, et al. Ch. 

 Ar/'/'x I'KNNANT (probably), Brit. Zool. (iv), iv, p. 72, t. :U\, f. 3. 

 Ch. latus LEACH, Moll. Brit. p. 231. Chiton (Lepidopleurus^ruber 

 JEFFKKYS, ]>iit. ^Toll. iii, p. 210. Trachydermon ruber CAi:ri;.\i i .1:. 

 Bull. Essex Inst. v, p. 153, 1873. Boreouhiton ruber SARS, Mll. 

 Reg. Arct. Norv., p. 116, t. 8, f. 4. TV. ruber DALL, Proc. V - 

 Nat. Mus. 1878, p. 320 (1879). Chiton incarnatus REEVE, Conch. 

 Icon. f. 194, 1848. 



The shell is apparently smooth, as described by Forbes and Ilan- 

 ley, but under a high power appears finely reticulated as observed 

 by Jeffreys. Its color is very variable, being usually marbled red 

 and whitish like Tonicella marmorea, but the valves may be uni- 

 form dark red or nearly pure white. I have one specimen with 

 the four central valves dark red and the rest white ; one valve in a 

 specimen is often dark red, while all the others are marbled. It is 

 most likely to be confounded with Tonicella marmorea and - 

 varieties of T. liueata, both of which have leathery girdles, while 

 this species can almost always be determined by its farina' 

 girdle, dusted with alternate red and whitish patches, the latter 

 nearly opposite the sutures. (Dall.} 



I. PUNICEUS Couthouy. PL 8, figs. 76, 77. 



Shell small, thin, elongated, elliptical, elevated and sharply ear- 

 iiuited along the back, of a dull rose, or bright brick-red color, and 

 6 



