ANIMALS. Oe) 
TEREBRATULA ScHLOTHEIMI, Von Buch. Tennant, Strat. List, p. 88, 1847. 
CAMAROPHORIA — 55 King, Catalogue, p. 7, 1848. 
TEREBRATULA — a Howse, Trans., T. N. F.C., vol. i, p. 252, 1848. 
sc — vi Geinitz, Versteinerungen, p. 12, pl. iv, figs. 
43-50, 1848. 
Diagnosis.—The typical Camarophoria. Generally as wide as long ; rarely exceeding 
five eighths of an inch in length or width; smooth; plain, and somewhat tumid in its 
posterior half; plicated or ribbed, and deeply sinuated in its anterior half; with from 
one to six generally dichotomous ribs in the sinus, or on its corresponding elevation, and 
the same varying number on the sides; of a sub-pentagonal form; pointed behind ; 
and rounded in front. Large valve rather rounded in the umbonal region; depressed 
at the sides; and with the front or sinus portion considerably produced arcuately 
beyond, and falling below, the latter (considering this valve as the upper one): fissure 
small. Small valve with the median elevation high in front, and the sides rapidly 
sloping. Marginal expansions extending to about half the length of the shell. 
Camarophoria Schlotheimi is a variable species,—not so much in its form as in the 
number of its ribs. Occasionally it is very much tapered behind, and longer than wide ; 
whereas the general tendency is to the contrary. As regards variation in the number 
of its ribs, there are five or six well-marked forms depending on their number 
in the sinus: the ribs on the sides are also subject to the same variation : occasionally 
specimens occur without any ribs either in the sinus or on the sides, as exhibited 
in fig. 10, Pl. VII. I suspect that, Dr. Geinitz has identified a shell belonging to the 
latter variety with the Camarophoria superstes of De Verneuil. I am also led to 
suspect that the shell which is identified in the ‘ Versteinerungen’ with the Zerebratula 
Geimitziana of the same author is a numerously plicated form of the present species. 
The principal varieties have been very truthfully represented by Mr. G. B. Sowerby, jun., 
in Pl. VII. With the exception of some slightly prominent lines of growth and a few obso- 
lete longitudinal strize, the surface of this species is remarkably smooth. The marginal 
expansions are slightly ribbed, the ribs being a continuation of those on the valves. 
Camarophoria Schlotheimi closely resembles the C. crumena’ of Martin, which 
1! When examining, in the Autumn of 1848, Mr. J. de C. Sowerby’s valuable collection of fossil shells 
figured in the ‘ Mineral Conchology,’ I was highly gratified with discovering that the shell represented in 
plate Ixxxiii, fig. 3, and identified with the Conchyliolithus Anomites (Crumena) of Martin, belonged to the 
genus Camaraphoria. The specimen which originally belonged to Mr. Martin, resembles the one figured 
in the ‘ Petrefacta Derbiensia’ (pl. xxxvi, fig. 4) so closely as to allow of little doubt existing of its being the 
original of the figure just cited. The others pecimens represented in the ‘ Mineral Conchology,’ pl. Ixxxiii, 
figs. 2, 2*, belong to a very different species, and evidently to the genus Hypothyris. The Gilbertsonian 
collection in the British Museum contains a card labelled Teredratula plicatella, Dalman, and mounting 
nine specimens with from three to five ribs in the sinus: no locality is given: they are undoubtedly 
Camarophorias: my notes state that they are identical with C. Schlotheimi; but I now suspect them to be 
the same species as the one noticed in the text, found in Weardale, Durham. I have also a memorandum 
stating that C. erwmene occurs in the same collection. 
