l-< I IN. H III I 



The outside of this shell so much iv-nnMe- id. 



i//-rs// that specimen- may have ln- ii distributed m <i 



Very few individual- \\ i v found. 



on the type .-pecimeii, pr.ih.-iSily from 0116 of tin- other In 



tlieonlv place in \\liidi tliev lit- /// *ifn, tliev are <|uite MiiM,,tli. 



I. B08EUB Bowerbj. IM. 21, figs, I'.'. '>". 



Shell ovate oblong, siiHM.tli. roseate; back rounded; front \, 

 and lateral areas of the intermediate valves loiigit mi inally. cent ral 



areas transversely sulcate ; posterior valve with ctntral ap 



eentrieallv sulcate. Len-'tli 1 7 ' -, hrcadtli 7 ' mill. fX 

 /. nf J'/titu i ( 'iiniinu ) ; i'<i-ii<iii<lo Noronha (Chsdlei 



r< rn i l.radley, in Mus. Yale College.) 



r//. rwetw'SoWB., I*. /. S. l,s:}2, p. 58; Conr-h. Illustr., f. 1 I. 



REEVE, Con ck Icon., t 25, f. 119. DESK, in Lam., An. s, \' 



vii. p. 4!s i not Cli'ifmi rntrn* lilainville, Diet. St. Nat. xxxvi, p. 



.".">:>. is-j.") f a species of Acanthochiton). l*<-lino<-liit<>,> ,-,,* /.< < 



.1/N. I.rhiiorh!t<m boof/ii HADDOX, Chall. Kep., Pulyphtr., j. \~t, 



(1886.) 



There is not the shadow of an excuse for the change of name made 

 liy ETaddon, as Blainville'a prior C.roseus belongs to a -em:- uni- 

 versally admitted to be distinct. The west coast locality is doulited 

 by lladdon, but it is supported by specimens in the Yale College 

 collection. 



( 'arpenter gives the following notes on this species : Valves and 

 plates very thin, snhdiaphanoiis; mucro median, little elevated. 

 Interior: post. v. with 8, central v. 1, ant. v. 11 slits; teeth very 

 acute; eaves very slender, moderately projecting : sinus large, Hat, 

 high, scarcely laminate; sutural plates small, subtriangular. ( iirdle 

 imbricated with minute solid, sim>f/i scales, with bristles intercalated 

 at the margin. The sutural lamina- are as .-mall as in /,>/>!< ; 

 an<l look like a mere prolongation of the in.-ertion plate- round the 

 comer. The scales though normally shaped and arranged, are SO 

 minute that Deshayes placed the species in the Tonicioid group. 



lladdon writes of J. row //.< (undei- the name /. bn<njii i, as toll 



The locality attributed, on the authority of ( 'inning, to tlii- 

 made the identification with it of a Chiton from 1-Yrnandn Noronha 

 very doubtful ; a shallow-water \asnot likely to live in both 



the Atlantic oil' IJra/il and in the Pacific nil' \\ -; lombia, \\illi 

 8 



