Trof. F. W. Hutton — On Geological Nomenclature. 59 



men found at Little Sodbury. It is just possible that some of 

 D'Orbigny's species from the I. 0. are synonyms. 



Description. — Specimen from the Dogger Sands (lower part of 

 zone 1), Blue Wyke. Leckenby Collection. 



The specimen is too much involved in matrix for close description. 

 The spire consists of about four whorls, which increase under a 

 regular angle, the apical ones being smooth and inflated. The penult 

 shows traces of a strong carina : the body-whorl, which is relatively 

 large, has two keels, of which the lower represents the margin of 

 the base. Shell plain. 



Belations and Distribution. — This small fossil is so near to Sowerby's 

 species that it would be unsafe to separate them. The specimen 

 figured is the only one known to have been found in the I. 0. of 

 Yorkshire. 



EXPLANATION OF PLATE II. 



Fig. 1. Neritopsis Icevigata, Phil. Variety A. Dogger, Blue "Wyke 



Leckenby Collectiou. Back view, x Ij. 

 ,, 2. lb. Variety A. Dogger, Blue Wyke. Jermyn Street Museum. 



Front view, x IJ. 

 ,, 3, 3«. lb. Variety B. Dogger, Blue Wyke. York Museum. Back 



and front views, x 1|^. 

 ,, 4, 4ff, ib. Turbo {Motwdonta) Icevigatus, Sow., var. bellulati. Bean. Dogger, 



Blue Wyke. York Museum. Back, front, and basal views, x IJ. 

 ,, 5, 5«. lb. Variety B. Dogger, Blue Wyke. York Museum. Back 



and front views, x l^. 

 ,, 6, 6a. lb. var. near to nvulata, H. &D. Dogger, Blue Wyke. Leckenby 



Collection. Back and front views, x \\. 

 ,, 7. Tti)-bo {Delphinuh), cf. funiculatus, Phil. Dogger Variety. 



Leckenby Collection. Back view, x 1^. 

 ,, 8. lb. CoRNBRASH Variety. Leckenby Collection. Back view, x 1|-. 



,, 9,9a. Turbo {Delphinnla) granatus, 'Beo.n ^\^. Yomig s-^ec\men. Dogger, 



Blue Wyke. Leckenby Collection. Apical and back views, x l|. 

 ,, 10, lOa. lb. Intermediate in size. Dojrger, Blue Wyke. Bean Collection, 



British Museum. Front and back views, x l\. 

 ,', 11, 11a, ) lb. Mature specimen. Dogger, Blue Wyke. York Museum. 



lib. i Back, front, and basal views, x \^. 

 ,, 12. lb. Section B. Probably an old or worn specimen. Dogger, 



Blue Wyke. Bean Collection, British Museum. 

 ,, 13. Tu7-bo{Delphinuki),si:)ecies. Dogger, Blue Wyke. Bean Collection, 



British Museum. Back view, x 1|. 

 ,, 14. Turbo [Belphirmla), species Dogger^ Blue Wyke. Bean Collec- 



tion, British Museum. Back view, x 1|. 

 ,, 15. Trochus, cf. dimicUatus, Sow. Dogger Sands, Blue AVyke. 



Leckenby Collection. Back view, x 1^. 



{To be continued.) 



II. — Geological Nomenclature. 



By Prof. F. W. Hutton F.G.S. 



SHOULD be much obliged if you would allow me to make a few 

 remarks on the subject of Geological Nomenclature. Certain 

 points connected with nomenclature are forced on the attention of a 

 geologist living at the antipodes of Europe which are not likely to 

 attract the notice of one who is working in, or near, the region from 

 which the standard table of rock-systems has been drawn up ; and 



I 



