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 uuauthenticated name ? 



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

 shell, 1 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 Jahrg. 

 1854, s. 558. taf. 21. fig. 9). But, in his last work. 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.l8. 

 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 })elieve, 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 Melania ? 

 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 suhangulata, 

 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 Tyneside Catalogue, p. 240, it is thus charac- 

 terized : — 



*^TuRRiTELLA Phillipsii, u. s. Shell elongated, narrow, 

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

 which are rather convex and slightly flattened behind ; suture deep; 

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

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



