﻿BIVALVIA. 



15!) 



Although I have not been able to see a specimen of that species to compare with it, yet, 

 as I now think that the shell figured in the ' Crag Moll.' is not Binghami, I have assigned 

 it (still with doubt) to the species mentioned by Dr. Carpenter, and on his authority. 

 I have seen no further specimens of the shell. 



Sphenia Binghami, Turton. Supplement, Tab. X, fig. 13. 

 Localities. Cor. Crag, Sutton. Red Crag, Sutton. 



The specimen figured in this Supplement was given to me by Mr. Charlesworth, who 

 found it in a fragment of indurated mud from the phosphatic nodule bed at Waldring- 

 field, and this, I have no doubt, is identical with the recent shell Sphenia Binghami. 

 I have retained the above generic name as I think the shell is distinct from Mya or 

 Corbula. The left valve has a projection on which is placed the cartilaginous connector ; 

 this extends along and under the dorsal margin on the siphonal side, and the right valve 

 has a depression for its reception. The interior of the shell is marked with a shallow 

 sinus. This shell has been so fully described as a species by the British Conchologists 

 that it is not necessary to repeat the description here. 



Genus — Lyonsia. 



Tab. X, fig. 17, of Supplement represents the hinge portion of a bivalve from the 

 Coralline Crag of Sutton, which I believe belonged to a species of Lyonsia. This frag- 

 ment shows the depressed and elongated pit beneath the dorsal margin in which, when 

 alive, was placed the internal connector. This pit is peculiar in its form, but I cannot 

 find that it has ever been represented ; although Lyonsia Norvegica has been figured about 

 twenty times and described under eight generic and nine different specific names, the 

 hinge has been mentioned only so far as that it possessed a movable and calcareous 

 ossicle. My fragment is very thin, fragile, and iridescent. 



Corbula contracta? Say. Supplement, Tab. X, fig. 11 a — c. 



Corbula contracta, Say. Journ. Acad. Nat. Sci., ii, 312. 



— — Gould. Inv. Massach., p. 43, fig. 37. 



— — Id. 2nd edit, p. 60, fig. 377. 



Localities. Fluvio-marine Crag, Bramerton. Chillesford bed, Ditchingham and 

 Easton Bavent. Middle Glacial, Hopton. 



