﻿1801.] 



KTttKBY PERMIAN, SOUTH YORKSHIRE. 



301 



front ; the outer lip is strongly convex ; the pillar-lip is slightly 

 convex, and a little reflected ; behind it is a very minute umbilicus 

 which in some specimens is scarcely observable. 

 Length y 1 ^- inch ; breadth JL. inch. 



In the adjoining quarries of Moor house and Hampolo Stubbs other 

 specimens of what is evidently the same species occur, twice or 

 thrice as large as those just described, and with a greater number of 

 whorls. These specimens are always in an imperfect condition. 



These Yorkshire Turritellce agree very well with Geinitz's figures 

 and description of Turbonilla Altenburgensis, their general width, 

 perhaps, being a little less compared with their length. They also 

 very much resemble the specimens found by Prof. King in the Tully- 

 connell limestone, and referred by bim to this species. There is a 

 much greater difference, however, between them and the Tumtellce 

 of the Shell-limestone of Durham, as there also is between the latter 

 and those of Germany. The Durham examples are much more finely 

 developed, ranging from half-an-inch to an inch in length, and with 

 from 8 to 12 whorls ; their aperture is also different, being more 

 angulate by the greater straightness of the pillar-lip. Still I think 

 that the Durham specimens may likewise belong to this species, their 

 differences being such as we may easily suppose to be due to their 

 higher state of development. I do not wish to assert this opinion 

 with much dogmatism, though it seems the most probable to me : 

 and I would add that it is in a similar spirit that I class with this 

 species the various forms indicated by the synonyms at the head of 

 these remarks. It is my opinion that the whole of them are refer- 

 able to the present species — it apparently having the right of pri- 

 ority ; and this is also the opinion of other Permian palaeontologists, 

 whose views are of more worth than my own*. Still it should be 

 acknowledged that the question is one of some difficulty and not 

 easy of solution ; and that there is, even yet, much to be said in 

 favour of the specific distinction of some of the forms here included 

 as synonyms. 



5. Chemnttzia Roessleri, Geinitz, Jahres. Wetter. Gesell. 1850-51. 

 Syn. Loxonema Swedenborgiana, King, Mon. Perm. Poss. p. 210. 



A single impression of a fragment of this species occurred at 

 Hampole Stubbs. The specimen shows five whorls strongly ribbed 

 transversely. It is about ith of an inch in length. The apex is not 

 shown, neither does the largest whorl of the impression appear to be 

 that of the body- whorl. Nevertheless the specimen possesses suffi- 

 cient character to allow the species to be determined,- — the form of 

 the whorls and their transverse ribs being unmistakeably those 

 of C. Roessleri. 



This species is found also in the Unter Zechstein and in the Shell- 

 limestone of Durham. 



* See Mr. Howse on T. Altenburgensis in Ann. and Mag. Nat. Hist., 2nd ser. 

 vol. xix. pp. 446-448; and Baron von Schauroth in Zeitschr. d. dent. Gesell. 

 1856, pp. 236-244. 



