rONIOBl 11 



TONIOKLUI < '\>r. 

 T. M\I:M<>KI:A Fahrieius. 1M. 10, fiir- s L5, 



Shell oblong or uvul, I'levah'd. ratln-r acntclv angular; hull', 



closely speckled and maculated with -lark n-d. as in Tr<ic//>l> 



ruhcr. Surface denttly, microscopically granulated, but apparently 



smooth. Lateral areas not distinct. Valves beaked, \im\tn .f pos- 

 terior valve slightly prominent, central. 



Interior rose tinted; anterior valve with 8-10, median valves 1, 

 posterior valve 8-9 slits. Sutural plates broad, rounded; >irms 

 deep, angular. 



(Jirdle leathery, nude. 



The gill rows extend forward three-quarters the length of the foot, 

 each containing 20-25 brand) in-. 



Length 40, breadth 24 mill. 



Length 27, breadth 16 mill. 



North Atlantic : Massachusetts Bay to Greenland; Holland to 

 Ireland and northward. North Pacific: Aleutian Islands and 

 Japan. 



Chiton marmoreus FABR., Faun. Gronl. p. 420, 1780. FORBES 

 & HANLEY, Hist. Brit. Moll, ii, p. 414, t. 58, f . 2 ; t. 59, f. 4. 

 JEFFREYS, Brit. Conch, iii, p. 227 ; v, p. 199, t. 56, f. 7. Chiton, 

 (Tonicia) marmoreus Fabr. Smith, Ann. and Mag. N. H. (4) xx, p. 

 139 (Franklyn Pierce Bay, Greenland). Tonicella marmorea Fabr. 

 CPR., Bull. Essex Inst. v, p. 154, 1873 ; Ann. Mag. N. Hist. (4) 

 xiii, p. 121. BALL, I c., vi, p. 124 (anat.) ; Proc. U. S. Nat. Mus. 

 1878, p. 324. Chiton ruber SPENGLER, Skrift. Nat. Selsk. iv, p. 92, 

 not of Linne. Chiton hvvigatus FLEMING, Edinb. Encyc. p. 113, t. 

 vii ; Brit. Anim. p. 290. REEVE, Conch. Icon. t. 27, f. 179. / 

 Chiton punctatus STROM, (teste JEFFR.) Acta Nidr. iii, p. 433, t. 6, 

 f. 14. Chiton latus LOWE, Zool. Journ. ii, p. 103, t. 5, f. 6, 7. 

 SOWB., Conchol. Illustr. f. 113. Chiton fulminatus COUTH., Bost. 

 Journ. Nat. Hist, ii, p. 80, t. 3, f. 19. GOULD, Invert. Mass, i, p. 

 14*, f. 3. Chiton pictus BEAN, in Thorpe's Brit. Mar. Conch, p. 

 264. Chiton flemingius LEACH, Moll. (Jt. Brit. p. 230. Boreo- 

 ch'doH marmoreus Fabr. SARS, Moll. Reg. Arct. Norv. p. 116, t. 8, 

 f. 3. 



This species has very much the color pattern of C. ruber, Imt 

 may readily be distinguished by its nude, leathery girdle. Sars 

 was evidently led by this superficial resemblance to create his genus 



