TF. U. Hudleston — On the Yorkshire Oolites. 63 



the same species. This latter is not unlike the figure and description 

 of C. qnadriseriatum, Desl. (Mem. See. Linn. Norm. vol. vii. p. 205, 

 pi. xi. figs. 29 and 30). 



Cerithium abbkeviattjm, Leckenby, 1859. 



1859. Cerithium abbreviatum, Leckenby, Q. J. G. S. vol. for 18o9, p. 13, pi. iii. 



fig. 12. 



The type specimen, now in the Woodwardian Museum, is so extremely imperfect 

 that one would hesitate what to say about this species. The length of the fragment 

 is 10 mm., representing most of the apical whorls of a shell whose original length 

 may have been greater. Although very much larger, the ornaments somewhat 

 connect it with 0. Comptomnse. Mr. Leckenby says that one-fourth of the length is 

 occupied by the aperture : I can discover no aperture either in the specimen or in 

 the tigm'e, which is clearly that of a shell with the aperture broken off. 



Unique specimen in the Leckenby Collection. Kelloway Rock, Scarborough. 



EXPLANATION OF PLATE III. 



EiG. 1. Cerithium muricatum, Sow. Dogger, Blue "Wyke. Collection of 

 Sowerby's types, British Museum. Enlarged twice. 



,, 2. Cerithium muricatum, Sow., form with 5 spirals, and arcuate longi- 

 tudinals. Dogger, Blue Wyke. Leckenby Collection. 

 Enlarged twice. 



,, 3. Cerithitm muricatum. Sow., var. sexlineatum. Dogger Sands, Blue 

 "Wyke. Leckenby Collection. Enlarged twice. 



,, 3a. "Whorl further magnified. 



,, 4. Cerithium muricatum, Sow., var. near to C. quadricinetum, Miinst.. 

 Cornbrash, Scarborough. Leckenby Collection. En- 

 larged three times. 



,, 4«. "Whorl further magnified. 



,, 5. Cerithium muricatum. Sow., var. Culleni, Leek. Type re-figured. 

 Kelloway Rock, Scarborough. Leckenby Collection. 

 Enlarged three times. 



,, 6. Cerithium muricatum. Sow., var. trilineatum. Scarborough Limestone, 

 York Museum. Enlarged twice. 



,, 6a. Body-whorl further magnified. 



,, 7 and 8. Extreme varieties of the C. muricatum group. Dogger Sands, Blue 

 "Wyke. Leckenby Collection. Enlarged twice. 



,, 9. Cerithium gemmatum, Morr. and Lye. The type specimen ? Scar- 

 borough Limestone. Bean Collection, British Museum. 

 Enlarged twice. 



,, 9«. "Whorl further magnified. 



,, 10. Cerithium Beanii, Morr. and Lye, typical form. Dogger, Blue "Wyke. 

 York Museum. Enlarged two and a half times. 



,, 10a. "Whorl further magnified. 



,, 11. Cerithium Beanii, Morr. and Lye, variety. Dogger, Blue Wyke. York 

 Museum. Enlarged three times. 



,, 11a. "Whorl further magnified. 



„ 12. Cerithium Leckenbyi, s^.u. Dogger, Blue Wyke. Leckenby Collection. 

 Enlarged two and a half times. 



,, 12a. "Whorl further magnified. 



,, 13. Cerithium turris, sp.n. Dogger, Blue Wyke. Jermyn Street Collection. 

 Enlarged twice. 



,, 13a. "Whorl further magnified. 



,, 14. Cerithium [Kilvertia) Comptonense, sp.n. Scarborough Limestone. Leck- 

 enby Collection. Enlarged four times. 



,, 14a. "Whorl further magnified. 



,, 15. Cerithium or Turritella, fragment from the Dogger Sands. Leckenby 

 Collection. Enlarged two and a half times. 



„ 15«. Whorl further magnified. 



