228 BRITISH CARBONIFEROUS BRACHIOPODA. 



that period, several more similar specimens having been discovered by Mr. Carrington in 

 the Carboniferous Limestone of Wetton, in Stafford shire, I have refigured the species, and 

 have distinguished it by a separate denomination. When placing adult specimens of the 

 shell under description in the same tray along with full-grown examples of Bit. pleurodon, 

 both appeared clearly distinguishable, but the distinction between it and certain specimens 

 of the Permian Camarophoria Ilumbleionensis, Howse, was not quite so apparent. 1 Bh. (?) 

 Carringtoniana is more regularly transversely oval than Rh. pleurodon ; the valves are more 

 evenly convex ; the ribs on the fold are not deflected so as to meet the correspond- 

 ing margin of the opposite valve, as is the case with the last-named species. The ribs of 

 Bli. Carringtoniana are also more rounded, and those on the lateral portions of the 

 ventral valve regularly arched, and not straight, with their extremities bent upwards 

 as in Bh. pleurodon. None of the ribs of Bh. Carringtoniana are longitudinally grooved 

 near their extremities, as is the case with Phillips's species. When quite young, and up to 

 a certain age, Bh. Carringtoniana is very slightly convex, and without any defined mesial 

 fold. 



CAMAROPHORIA (pp 113 — 118). 



Four species have been recorded, but more abundant and better materials, with refer- 

 ence to C. isorhgncha and C. lateralis, must be obtained before these so-termed species 

 can be definitely admitted. Of the first, I am acquainted with but a single imperfect Irish 

 example, now in the possession of Sir R. Griffiths ; of the second, with those only in the 

 Cambridge Museum. C. crumena is a well made out species, and certainly the same as 

 that from the Permian rocks, known under the designation of C. Schlotheimi. Nothing 

 definite can be said with reference to Camarophoria (?) proava, which is, probably, a 

 variation of C. crumena. 



Strophomena analoga (pp. 119—123). PL XXVIII, figs. 1—13. 



With small modifications, in detail, this species appears to have been recurrent 

 from the Silurian and Devonian periods ; the term analoga may be retained for the Car- 

 boniferous variety. 



Stiieptorhynchus Crenistria (p. 124). 



I can add but little to what I have already said with reference to this species and its 

 varieties ; but some very interesting interiors of the dorsal valve, found by Mr. Barrow 



1 It is at times difficult to determine, from exteriors only, whether a shell belongs to Rhynchonella or 

 to Camarophoria, and this is the case with the three or four examples of 11. Carrinytonauia I have been 

 abb' to examine. 



