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SUPPLEMENT TO THE CRAG MOLLUSCA. 



In the ' Crag Moll./ vol. ii, p. 132, I described a small shell under the provisional 

 name of Cyamium eximium. I am sorry to say that I have seen nothing since that 

 will assist in its correct determination ; and the specimen itself has been subsequently 

 much injured. It may probably be a small or young individual of the above. Under 

 these circumstances I have thought it best to suppress the name Cyamium eximium in the 

 general list which accompanies this Supplement. 



Scacchia cycladia, S. Wood. Crag Moll, vol. ii, p. 122, Tab. XI, fig. 4 (as Kellia 



cycladia). 



Locality. As in ' Crag Moll/ 



This shell is still very rare to my researches. I have not met with a specimen since 

 the one above referred to was engraved, but I have re-examined my specimens given to the 

 British Museum, and think them quite distinct from Scacchia {Kellia) orbicularis. 



Anatina ? pusilla, Phil., ' En. Moll. Sic./ vol. i, p. 9, Tab. 2, fig. 5, may possibly be 

 the same as my Crag shell, but it will be necessary to compare specimens before such 

 identity can be established. 



Scacchia orbicularis, S. Wood. Crag Moll., vol. ii, p. 120, Tab. XII, fig. 9 (as Kellia 



orbicularis) ; and Supplement, Tab. IX, fig. 9. 



Localities. As in ' Crag Moll.' 



The shell figured in the present Supplement is a very globose variety of this species, 

 without the obliquity generally observable, from which I at first imagined it was a distinct 

 species. Specimens of orbicularis have lately been obtained by Mr. Jeffreys in the living 

 state, and he has referred them to Scacchia cycladia {Kellia cycladia, ' Crag Moll.'). I, 

 however, believe the species to be distinct. 



Kellia suborbicularis, Mont. Crag Moll., vol. ii, p. 118, Tab. XII, fig. 8. 

 Localities. As in ' Crag. Moll.' 



If this be not one of the boring bivalves, it is a shell that is often found in a crypt 

 with a true excavator, as I have found a perfect specimen of it in association with the 

 valves of a Gastrochcena in a crypt formed in a fragment of an Ostrea from the Cor. Crag 

 of Sutton, and it was of that size that it could not escape through the terminal opening ; 

 moreover, it was in the crypt in front of the valves of the Gastrochcena. This 

 species {suborbicularis) has an extensive range in the living state, and I have a specimen 

 from the Coast of California, given to me by Dr. P. Carpenter, in which I cannot detect the 

 slightest difference from the recent shell of our own seas or from my Crag fossil. Mr. 



