126. SUPPLEMENT TO THE CRAG MOLLUSCA. 
according to information furnished me by the late Dr. Woodward, a memorandum on the 
back of the tablet, stating that it came from the Nar Brickearth, where the shell has been 
found by Mr. Rose. I have, therefore, omitted the locality of Bridlington for it. The 
figure in ‘Crag Mollusca’ is not quite accurate, the posterior side being a little too 
rounded for the general form of the Crag specimens. 
Montacura Ferrucinosa, Mont. Crag Moll., vol. ii, p. 129, Tab. XII, fig. 14. 
Locahties. Cor. Crag, Sutton, and near Orford. Chillesford Bed, Aldeby. 
Specimens of this species were among the shells from time to time sent me for 
examination by Messrs. Crowfoot and Dowson from Aldeby. 
Monracura Eeuuiprica, S. Wood. Supplement Tab. X, fig. 21. 
Locality. Coralline Crag, Sutton. 
The above figure represents a specimen of Jontacuta, which appears to be distinct 
from the shell called d¢dentata. It has the posterior side more rounded and more extended 
than dcdentata, and is less inequilateral. It is also less compressed and more elliptical, 
and has the denticles comparatively longer. 
Genus.—SPHENALIA (see ante, p. 121). 
SPHENALIA DONACINA, S. Wood. Crag Moll., vol. ii, p. 131, Tab. XI, fig. 3 (as Monta- 
cuta ? donacina). 
Localities. As in Crag Moll. 
A Coralline Crag shell from Sutton was described in the ‘ Crag Mollusca’ under the 
above provisional name. It, however, does not in the hinge accord with Montacuta 
bidentata, the type of the genus Montacuta, and I have accordingly changed its position. 
I am sorry to say that the Crag fossil is still very rare in my collection. A recent British 
specimen has been procured by Mr. Jeffreys, which he has referred to my species, and he 
is equally at a loss where to place it. He says (‘ Brit. Conch.,’ vol. ii, p. 216), “in 
shape it is a miniature Zenatia, a genus founded by Dr. Gray, but having an external 
ligament.” he shell, however, given by Messrs. H. and A. Adams as the type of 
Zenatia (Gen. of Recent Moll. vol. ii, p. 384, plate cii, fig. 1, Z acinaces) is an 
aberrant form of Zu¢raria, with a deep sinus in the mantle mark. The nearest approach 
to this species seems to me to be the succeeding species swdstriata. 
