[CIA, l'7 



n ' FBXKBLY, ZooL .i<>un>. ill, p. 208, -nppl., pi. 17, f. 



6. S. >\\ r... ( 'oiich. Illuslr.. no. 75, II i.i.v i , ( ouch. Icon., t. I. f. 11). 

 ('. 3OWB.J Conch. IllnMr., f. 7-'), 7 \ 'young.) 



The type species of T"iii<-in. The scul ptu re is well shown in fi;:. 

 1 )% J : the color-pattern in the liirure l>ct\\ccn '2'2 and lM. 



Subspecies cnii.i N-I- Fremhly. PI. 41, figs. 19, 20. 



Shell rather heavier and thicker than T. rlgr/an*, with thicker 

 girdle. G>A>r uniform tlnrk chocolate brown, except near the beaks 

 n'here ff re /.< a large or sum// arm th< *hnj>r of f/ir ra/rr n-hich is 

 /i'/hf de/irnfe/it mnff/><l irith r<'<1aili ; girdle dark brown, wide at the 

 sides, narrow at the ends. 



Th> tlingtinul litir /x turmounted by a wie* <>f #wnll tubercle; 

 lateral areas showing fewer and less conspicuous eye-spots than T. 

 el''</(iu*i and otherwise ?}/////// xnumfli, flu- t/r<niul<ition being obsolete ; 

 central areas striated on each side of a median smooth band, and 

 more or less (variously) roughened at the sides ; second valve sub- 

 carinate, striated in the middle. End valves radially, sparsely 

 granulate and dotted with eyes, the umbo of the tail valve obtuse, 

 conspicuous, elevated, a little in front of the middle. 



Interior white, marked with reddish under the beaks. Sinus 

 toothed. Sutural plates broad, especially at the outer-anterior portion . 

 Anterior valve having 7, central valves 1, posterior valve 8 slits; 

 t> > th r> /'/ thick and b/tmt, strongly, closely pectinated. 



Girdle leathery, naked, rather thick. 



Length 38, breadth 28 mill.; divergence 130. 



Length 68, breadth 43 mill. 



Valparaiso, under stones. 



C. r/iit''n.I* FREMB., Zool. Journ. iii, p. 204, suppl., pi. 17, f. 8. 

 REEVE, Conch. Icon., t. 3, f. 17. Tonicia chilenxis ROCHEBRUNE, 

 Nouv. Arch, du Mus. 1881, p. 240 (Reported from the Canaries, on 

 the authority of specimens so labelled in the Paris Museum, but 

 undoubtedly false.) 



This form is very closely allied to T. elegans, differing mainly in 

 the (a) dissimilar coloration, (/>) more numerous stria? on each side 

 of the median smooth band, (c) generally obsolete granulation of the 

 lateral areas, (d) thicker insertion-teeth, and in the thicker girdle ; 

 a still better distinction is in the tail-valve, which in rh Mentis has a 

 more prominent umbo, nearer the center than in < /ff/ans, and the area 

 in front of the umbo is striated, whilst in rlei/nn* it is smooth. All 



