NORTHUMBERLAND AND DURHAM. 275 



is affixed to a long train of names of Loxonema rvglfera, and a 

 new specific name, as it is called, is very quietly appended, 

 and a " diagnosis" substituted, which would apply to a great 

 number of species of a great many genera ; and, in the remarks, 

 an admission is made that " imperfect specimens, about an inch 

 in length, of a species resembling Loxonema riigifera^ Phillips, 

 have twice occurred to me ; but through some accident, they 

 have been mislaid." Now, unless these " missing specimens" 

 have since been found, there does not exist a type-specimen of 

 Loxonema Swedenhorgiana, King, according to this author's own 

 statement ; and why then should palaeontology, grievously over- 

 burdened 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 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 niore turreted than the C. Altenhurgensis, 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. 



2. C. Altenburgensis, Geinitz^ sp. PI. XI. 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," Gcol. Trans. 2nd ser. vol. iii. p. 118: — 



