CAMAROPHORIA. 27 



appear to closely resemble De VernemTs figures ; but not having hitherto been able to 

 examine the Russian type, I cannot comment upon its specific merits. M. De Verneuil 

 observes, in the second volume of the 'Geology of Russia/ p. 101, that his species is 

 distinguished by certain slight external characters, such as the more rounded shape and less 

 prominent ribs on the lateral portions of the shell, the last being at times completely 

 wanting, as well as the general contour, which is more triangular than pentagonal. 



Loc. C. Schlotheimi is one of the most common species in the Permian rocks of 

 Humbleton and Tunstall hills, less abundant at Hylton Castle, Silksworth, Ryhope, 

 Dalton-le-Dale, Tynemouth Castle-hill, &c. On the Continent it appears equally abundant 

 at Ropsen, Milbitz, Poessneck, Corbusen, Schmerbach, &c, in Germany. It is stated by 

 M. De Verneuil to occur in the Carboniferous strata of Russia. 



Camarophoria globulina, Phillips. Plate II, figs. 28 — 31 ; and King's Mon., pi. vii, 



figs. 22—25. 



Terebratula globulina, Phillips. Encyc. Met. Geology, vol. iv, pi. hi, fig. 3, 1834. 



Shell small, globular, almost as wide as long, with convex inflated valves, ornamented 

 by from six to nine short angular ribs on the dorsal, and five to eight on the ventral valve ; 

 of these two, more rarely three, occupy the mesial fold, and one or two the corresponding 

 sinus, thus producing a bisinuated or trisinuated frontal wave. The ribs take birth at 

 about half the length of the shell, and extend to the margin. Beak small, entire, rounded 

 and incurved; foramen minute, with small deltidial plates. No marginal expansions? 



Length 4, width 4, depth 3 lines. 



C. globulina is common in the shell limestone of Tunstall and Humbleton hills, Hylton 

 Castle, Dalton-le-Dale, and Ryhope-house Farm ; as also, but more rarely, in the conglome- 

 rate of Tynemouth. It was named T. corymbosa by Mr. Howse in his ' Catalogue/ but 

 afterwards referred to that of Phillips. 



Camarophoria Humbletonensis, Howse. Plate II, figs. 9 — 15; and King's Mon., 



pi. vii, figs. 26 — 32 ; and pi. viii, figs. 1 — 7. 



Terebkatula Humbletonensis, Howse. Catalogue of the Fossils of the Permian 



system of the Counties of Northumberland and 

 Durham, T. N. T. C, vol. i, part iii, p. 252, 17th 

 August, 1848; and Annals of Nat. Hist., vol. xix, 

 2d series, p. 50, pi. iv, figs. 3, 4, January, 1857. 



