466 Mr. R. Howse on the Permian System of the 



Now, unless these " missing specimens" have since been found, 

 there does not exist a type-specimen of Loxonema Swedenborgi- 

 ana, King, according to this author's own statement ; and why 

 then should palaeontology, grievously overburdened already, be 

 pestered with another unauthenticated name ? 



As Mr. King's " diagnosis" and remarks do not apply to my 

 shell, I prefer adopting the one proposed by Dr. Geinitz, espe- 

 cially as the same shell has been further mentioned and figured 

 by Baron Schauroth (Zeitschr. d. deutschen Gesellschaft Jahi-g. 

 1854, s. 558. taf. 21. fig. 9). But, in his last vv^ork, Baron 

 Schauroth has given a preference to King's name without assign- 

 ing any reason for the change, and he also seems inclined to 

 think that it is only a variety of the following species. 



It is more turreted than the C. Altenburgensis, and the pli- 

 cations do not appear to be accidental, but permanent and of 

 specific value. Specimens that have occurred are about half an 

 inch in length. 



Collected in the shell-limestone of Tunstall and Humbleton 

 by Mr. Kirkby and myself, and in Germany it is mentioned by 

 Dr. Geinitz and Baron Schauroth. 



37. Chemnitzia Altenburgensis, Geinitz, sp. Pl.IV.fig.18. 

 It seems to be necessary to trace the history of the discovery 

 of this little shell, which has been described within the last ten 

 years under five or six different names, in order to establish the 

 epithet adopted above for this species. 



It is, I believe, first mentioned, in the following words, in 

 Prof. Sedgwick's paper on the " Magnesian Limestone, &c. of 

 the North of England," Geol. Trans. 2nd ser. vol. iii. p. 118 : — 



" To this list may be added (five errat.) a species of Melmiia ? 

 less than half an inch long, with eight whorls; Hawthorne Hive. 

 (MS. Catalogue by Mr. J. Phillips.)" No specific name is ap- 

 plied to it. 



The next mention of it (unless the Murchisonia subangulata, 

 Vern., be the same shell), and the first accompanied with a short 

 description, figure, and specific name, is by Dr. Geinitz in the 

 ' Versteinerungen des deutsch. Zechsteingebirges,' p. 7. tab. 3. 

 figs. 9, 10. The short description is in the following words : — 



Turbonilla Altenburgensis, " a little tower-shaped snail, with 

 six or more rounded, smooth whorls," &c. 



Next, in the Tyncside Catalogue, p. 240, it is thus charac- 

 terized : — 



"TuRiiiTELLA Phillipsii, u. s. Shell elongated, narrow, 

 slightly tapering, turreted ; spire ivith 12 or more rounded whorls, 

 ivhich are rather cu)ivex and slighthj jlattened behind ; suture deep; 

 pillar-lip slightly angulated in front ; aperture suborbicular." And 

 "T. TuNSTALLENSis. Shell elongated conical; spire with 8 



