Counties uf Du/ham and Northumberland. 1G7 



whorls, which are much ruunded, smooth ; suture deep ; aperture 

 orbicular." 



Notwithstanding the differences pointed out, after examining 

 a large series of specimens, I am now of opinion that the latter 

 shell is only a variety of the former. 



The next two notices of this shell are by Mr. King, ' Cat. Org. 

 Remains,' &c. p. 13, and ' Perm. Mon.' pp. 209, 210, In both 

 these works it has the following " diagnosis" : — 



"LoxoNEMA FASCiATA, n. sp. A subulatc, many -10 hor led, 

 smooth species, with two or more dark-spiral bands, crossed by 

 others, on a light ground ; its outer lip is inversely sigmoid." 



If this " diagnosis" had not been accompanied with a figui'e, 

 I could not have identified it with the preceding shells ; but the 

 figure in 'Perm. Foss.' tab. IG. f. 30, establishes its relationship 

 to them without doubt, and at the same time it shows that 

 Mr. King's "diagnosis" of the species is incorrect. The general 

 form is not " subulate," but turrete4, or tower-shaped, as Geinitz 

 expresses it. The terms "dark-spiral" and " inversely sigmoid " 

 are not very intelligible. 



In ' Perm. Mon.' Mr. King places both the Turritellce described 

 in the Tyneside Catalogue with his L. fasciata. This would not 

 have surprised me in the least, had he not immediately after- 

 wards (Perm. Mon. p. 210) redescribed the Turritella Phillipsii 

 under a new specific name, Loxonema Geinitziana. That the 

 shells described under both these names are identical, cannot be 

 denied by any one able to admit the truth ; and it is certainly 

 much to be regretted that such an oversight as this and many 

 others pointed out in this paper disfigure the fair pages of the 

 ' Permian Monograph.' 



In the ' Journal of the Dublin Geol. Soc' April 1856, Mr. 

 King mentions, under the name Rissoa ? Altenburgensis, Gein., 

 the occurrence of this little shell in the Permian rocks of Ire- 

 land. 



Lastly, in Germany, Baron Schauroth, in his last contribution 

 on Permian Fossils (Zeitschr. d. deutschen geologischen Ge- 

 sellschaft Jahrg. 1856, s. 241,242), adopts for this species King's 

 inappropriate epithet Geinitziana, and unites with it the L. fas- 

 ciata, King, and the Turbonilla Altenburgensis, Geinitz. In the 

 same paper the Loxonema Geinitziana, King, is redescribed 

 under the new name Rissoa gracilis. I have been favoured by 

 Baron Schauroth with some carefully-made clay-casts of these 

 shells, and I think they are perfectly identical with those from 

 the English Permians. 



All the shells enumerated above are, I believe, referable to 

 one species; and the name given to it by Geinitz originally 

 ought to be adopted for it at present. 



30* 



