Mr. W. Clark on the Chemnitzise. 393 



species, taken rarely, but alive, at Exmouth. The C. excavata 

 is a good species, which I found at the last place. 



The new Chemnitzia Barleei, as yet only known as a northern 

 production, is the discovery of that excellent and indefatigable 

 malacologist whose name it bears, and from specimens from him- 

 self has first been ushei'ed into notice by ourselves as an un- 

 doubted member of this singularly difficult genus ; and it affords, 

 in the misconceptions that have attached to it, a pMii pl*oof of 

 the correctness of this observation. •"'' ■ ' 



The Cglabratat of Miihlfeldt, said to be a production of one of 

 the isles of the Ultima Thule, is quite unknown to u.s. The ani- 

 mals of the C acuta, C. conoidea and C. spiralis are fully mentioned 

 in our former paper. Their shells are admitted as genuine indi- 

 gena by every one. The Chem. acuta was discovered by us many 

 years since at Exmouth, but at the time we neglected to publish 

 notes on the hard parts ; it is curious that after a lapse of thirty 

 years we should be the first to discover and describe the animal. 

 And lastly, the Chemnitzia diaphana, which is the R. diaphana of 

 ■Mr. Alder's Northumberland catalogue, is fully described in the 

 first notes on this genus, and the animal shown to be of the true 

 Chemnitzian type, scarcely differing from the C. conoidea : it has 

 enjoyed a position to which I think it is not entitled, as I regard 

 it a simple Chemnitzia, as well as its congener the Chem. opalinii 

 described in the April 'Annals,' 1851. It must not be conJ 

 founded with that " diaphana" which has been brought forward a^ 

 a distinct species, and which has been considered to be a synonyni' 

 of C. obliqua. - iii 



After the reforms we have submitted, the British list will' e^i-^ 

 hibit some attenuation ; but a still numerous and a soundet* 

 family will testify the importance of this truly British group^*^ 

 which far outnumbers the discoveries of any other country Hi' 

 respect of this peculiar and very interesting genus. We think 

 that the expurgation that has been made will bring the acquire-- 

 ment and identity of our indigenous species within the refwih <jf 

 the naturalists of this particular line of science. if ')f'{ntr8 adi 



The list will now stand thus : — 



True species. „ 



(phemnitzia pallida. Cheiunitzia scillac. Chemnitzia decussata. to 



— — conoidea. excavata. rufa. , . . 



— — -acuta. diaphana. scalaris. 'i 



— insculpta. ? glabrata. elegantissimi'.'^ **^ 



iuterstincta. nivosa. ■ nitidissimaj-'I -iM 



,,-p-;7— Snudvicensis. unidcntata. • acicula., ' ydT 



,77— fi'lvocincta. — plicata. Barleei. ^^ ^^^,^^[^ 



■ nuescens. obhqua. Gidsonaci r 



>^^-'^— fenestiata. — — spirahs. opalina.*^"^ oa^n 



•'*^ — I luiica.. ijijjii o'/' Jiu , f.-Jiji(]>- iiiii tiiii )\H (^I'i iJSiJf 



w ; I 1) b)iIiiU)i W-rrr a fi «5i\>\v>s\o . ?j» yd bodiiogob 



