326 APPENDIX. 
PHotapipEa? Tab. XXXI, fig. 23. 
This is the representation of a specimen obtained by Mr. John Middleton from the Crag “ Diggings,”’ 
near Woodbridge, and obligingly put into my hands for publication by Mr. Woodward, who considers it a 
genuine fossil of the Red Crag. It appears strongly to resemble the calcareous case of a species of boring 
Mollusc, and the generic position he has chosen for it is probably the correct one, belonging to the 
section Martesia, Gray. The interior is filled with mud or clay, and particles of sand, but the valves are 
gone. The exterior presents concentric ridges or elevations (about a dozen): these are in relief, and 
correspond with the depressions or furrows often seen in the cavities formed by the Pholades. 
In my cabinet are some crypts of a similar form, excavated in a nodule of chalk found in the Red 
Crag, evidently the production of a boring Mollusc. In my specimens the valves are gone, and the walls 
in some of the cells are marked with concentric ridges. 
The following existing British species, not found in any of the Crag Formations, are enumerated as 
belonging to the Upper Tertiaries of these kingdoms, in accordance with the authorities attached :* 
PATELLA PELLUCIDA. 
Trish Drift Beds. (Forbes.) 
Lucinopsis (LUcINA) UNDATA. 
Clyde Beds. (Smith.) 
CaRDIUM ACULEATUM. 
Clyde Beds. (Smith.) 
CYPRINA PROPINQUA.T 
Clyde Beds. (Smith.) 
CyTHEREA LEVIGATA.T 
Clyde Beds. (Smith.) 
VENUS VERRUCOSA. 
—  STRIATULA (GALLINA), 
Clyde Beds. (Smith.) 
* When the Paleeontographical Society was first established the Crag Formations were the allotted 
portions for my Monograph, while the more recent deposits of the British Isles were intended to form the 
subject of a separate work by James Smith, Esq., of Jordan Hill; and it was not until after the publication 
of my first volume that any alteration was made in this arrangement. Mr. Smith found the fossils of these 
Uppermost Tertiaries were, with so few exceptions, identical with existing species, that he thought they were 
not of sufficient importance for a distinct work: it has therefore devolved upon me to mention those few 
that have become extinct upon our own coasts, and this willin some degree explain the irregular and imperfect 
manner in which I have introduced the species; and as this has taken me rather beyond my original 
intention, it has affected the correctness of my former title-page, and rendered it necessary to substitute a 
new one. 
+ These two species, noticed by Mr. Smith in his paper upon the ‘ Post-Tertiary Deposits of the Basin 
of the Clyde,’ ‘ Trans. Geol. Soc.,’ 2d series, vol. vi, p. 155, he still thinks are decidedly distinct, and such 
