2b2 NOTES ON THE PERMIAN SYSTEM OF 



nodulosa, King, witli the Pleurotomaria VerneuUi, Geinitz. As 

 this identification is undoubtedly correct, and as Geinitz's 

 description and figure appeared several months "before King's 

 Catalogue, the name adopted above has right of priority. 



In well-preserved specimens the whole surface of the shell is 

 ornamented with strong, longitudinal, raised lines, which being 

 cut obliquely by the strong lines of growth, give the whole sur- 

 face a beautiful, decussated appearance. The double row of 

 nodules is not so persistent a character as the former, for the 

 sutural row is not seen on young individuals, and the row placed 

 below the fissure becomes obsolete in very large full-grown spe- 

 cimens. It appears to have been the most beautiful and deli- 

 cate shell of the Permian seas, and from the numerous examples 

 of bored shells that occur — a fact which I first pointed out to 

 Mr. King — it probably, with its congener, P. antrum, preyed 

 upon its more peaceful and unprotected neighbours. 



The specimen figured in " Perm. Mon." is a young individual. 

 The largest specimen I have seen exceeded an inch in length and 

 width. 



It occurs in the shell-limestone of Tunstall and Humbleton. 



34. DENTALIUM, Z/7?;i. 

 1. D. Speyeri, Geinitz. 



Mr. Kirkby has recently found a very fine specimen of a 

 Dentalium, Avhich, after seeing both German and English speci- 

 mens, I think is referable to the above species. The German 

 specimens I saw in the superb cabinet of Permian fossils col- 

 lected by Mr. P. Eisel, jun., in the neighbourhood of Gei-a. 

 Baron Schauroth has also noticed its occurrence in the same 

 locality, under King's name. Dent. Sorhii ; but it would be quite 

 impossible to determine, without seeing the specimen, whether 

 the one mentioned by Mr. King is identical with the present 

 species. Both King's and Geinitz's names were publislied iu 

 1850. 



In the shell-limestone, Tunstall Hill. 



