120 PERMIAN FOSSILS. 
appears only to differ from the former in being narrower and more acuminated behind. 
Occasionally, however, a variety of the present species occurs, which can scarcely be 
distinguished from C. crumena: in short, both species apparently merge into each other 
so completely, that many would be inclined to consider them as specifically separable. 
The Lamarckian might very reasonably instance them as proving proximate species to 
be modifications of each other; while, at the same time, his opponent might with 
equal reason contend for their being the result of a single specific creation. There is 
another species, undescribed, occurring in the Carboniferous Limestone of Weardale, 
Durham, and having a still closer resemblance to C. Schlotheimi in form ; but its spatula- 
shaped process is decidedly more curved,—so much so, that its termination is not far 
removed from the anterior end of the arch of the large valve. 
This species is a very common fossil at Tunstall Hill and Humbleton Quarry, anda 
less common one at Ryhope Field-House Farm, in the Shell-limestone. - I procured a few 
specimens in the Breccia at Tynemouth Castle Cliff. Schlotheim first noticed it as 
occurring in the bituminous Marl-slate (Kupferschiefer) of Schmerbach. Geinitz and 
others record its occurrence in the Zechstein of Corbusen, Schwaara, Ropsen, Milbitz, 
Ilmenau, Sangerhausen, Schmalkalden, Schmerbach, and Kamsdorf. M. de Verneuil 
notices it as occurring in the Carboniferous Limestone of Mount Chéractau near 
Sterlitamak, at Sarana on the Ufa, and at Cosatchi Datche, in Russia.' 
CAMAROPHORIA GLOBULINA, Piillips. Plate VIL figs. 22, 23, 24, 25. 
TEREBRATULA GLOBULINA, Phillips. Encyc. Met. Geology, vol. iv, pl. ui, fig. 3, 1834. 
CAMAKOPHORIA — ie King, Annals of Nat. Hist., vol. xviii, p. 28, 1846. 
= — Bays King, Catalogue, p. 7, 1848. 
TEREBRATULA CORYMBOSA, Howse. Trans. T. N. F. C., vol. i, p. 253, 1848. 
Diagnosis —Sub-globular ; rarely exceeding a quarter of an inch in diameter ; 
smooth ; slightly simuated in front. Szdes (looking down on the perforate valve) higher 
than the front, which falls considerably below the latter: sedes and front more or less 
ribbed. Aiés sharp and simple. Uméones slightly projecting and incurving. Both 
valves Convex. 
This small species, first named and figured, though not described, by Professor 
Phillips, is with difficulty distinguished from young specimens of Camarophoria 
Schlothemi: it may be known, however, by having both valves of nearly the same 
convexity ; but the difference may be also recognised by comparing it with full-grown 
specimens of the latter, which it will be seen could not have had the ribs so prominent 
when young as they are in correspondingly sized specimens of C. globulina. 
! Perhaps the shell discovered by M. de Verneuil in the Russian carboniferous limestone, and identified 
with the Camarophoria Schlotheimi, may be the same as the species occurring in the carboniferous limestone 
of Weardale; and the C. superstes, the C. erumena,—both having a similar marginal outline. 
