124. SUPPLEMENT TO THE CRAG MOLLUSCA. 
In the ‘Crag Moll.,’ vol. ii, p. 182, I described a small shell under the provisional 
name of Cyamium eximium. J 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. 
Scaccuta cyciapta, S. Wood. Crag Moll., vol. ii, p. 122, Tab. XI, fig. 4 (as Kelha 
cycladia). 
Locality. As im ‘ 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 Seacchia (Kellhia) OE 
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. 
Scaccuia orBicuLaRis, S. Wood. Crag Moll., vol. u, p.120, Tab. XII, fig.9 (as Kelha 
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. u, p. 118, Tab. XII, fig. 8. 
Localities. As im ‘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 Gastrochena ina 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 Gastrochena. ‘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. 
