268 APPENDIX TO THE 



CAMAROPnoRiA rhomboidea, Phillips, sp. Camarophoria globulina, Phillips, sp. 

 1836. Dav., pi. liv, figs. 20 — 22. 1834. Dav., pi. liv, figs. 23—25. 



After a very attentive comparison of many specimens of these shells from the Carbo- 

 niferous and Permian deposits, I cannot perceive the smallest distinguishing features ; 

 specimens of equal size resemble each other, as may be seen from my illustrations. The 

 Carboniferous form, when full grown, has attained somewhat larger proportions than any 

 I have observed from the Permian rocks. The term globulina, from having been first 

 proposed, should be employed for both, and that of rhomboidea be placed among the 

 synonyms. 



Carboniferous Names. Permian Names. 



Discina nitida, Phillips, sp. 1836. Dav., Discina Koninckii, Geinitz, 1848. Dav., 

 pi. liv, fig. 26. pi. liv, fig. 27. 



Having examined and compared with much attention a number of Carboniferous 

 and Permian specimens of these two so-termed species, I have come to the conclusion that 

 there exists no specific difference between them, and that the term nitida will have to be 

 made use of for the Permian shell. Many large and well-preserved specimens of the 

 Permian Discina have been collected by Messrs. R. J. Manson, T. Parker, and E. 

 Gower, in the compact Limestone of East Thickley, near Darlington, which are identically 

 similar to others from the Carboniferous shales of Capel Rig in Lanarkshire ; in all we 

 could perceive the same contour, the same degrees of convexity and external sculpture. 



Lingula mytiloides, Sow., 1812. Dav., Lingula credneri, Geinitz, 1848. Dav., 

 pi. liv, figs. 28—31. pi. liv, figs. 32—34. 



In his excellent paper (already quoted) Mr. Kirkby has satisfactorily proved that the 

 Permian Lingula Credneri is found in the Carboniferous Rocks of England, a fact I can 

 likewise attest from personal observation ; but I must go a step further, by suggesting 

 that the Permian Lingula is doubtfully distinguishable from Sowerby's L. mytiloides, which 

 was likewise described from specimens obtained in the Carboniferous Shales of "Wolsing- 

 ham in the County of Durham. Mr. Tate is of opinion that L. Credneri is nothing more 

 than a small variety or race of Sow r erby's species. 



It is not my present desire to enter into further details with reference to certain other 

 species which may possibly be recurrent, but I cannot help mentioning that it is not 

 quite certain that Crania Kirkbyi is distinct from C. quadrata, nor that Spiriferina multi- 

 plicata and Sp. cristata should be separated. 



