16 



DUiTDEY GASTEEOPODA. 



There is a very broad flat space at the sutures. The shell is 

 not preserved, so we cannot say whether it be punctate. 

 There are in the Museum two specimens. 



Locality — Dundry, /«/", Ool, 



CHEMNITZIA LIIS^EATA, Sowerby. 



1818. Melania lineata, Sow. Min. Conch., pi. 218, 



fig. 1, p. 33. 

 1850. Chemnitzia lineata, D' Orb. Pal. fr. Terr. Jur. 



Ijl. 239, figs. 4, 5, p. 43. 

 Syn? 1842s Melania procera var. b. Desl. Mem. Soc. Linn. 



IN'orm. YIL, pi. 12. fig. 



6, p. 223. 



This is a very variable shell, and approaches very nearly to 



the next species in some cases, though it is easy to find specimens 



differing widely therefrom, and agreeing exactly with Sowerby' s 



figure. 



The chief characteristic I take to be the lines of punctse 

 arranged spirally, (not transversely across the whorls as might 

 be supposed fi^om Sowerby's figure); this alone perhaps enables 

 one to distinguish it from the next species, for the whorls are 

 often separated by a depression formed by the bevilling of each 

 whorl at the suture. 



Deslongchamps (loc. cit p. 224) in founding his species 

 C. procera, says he thinks his v a r. b . may be the same as the 

 present species ; I think it very probable. 



There are over a dozen specimens in the Museum. 



Locality — Dundry. Inf, Ool. 



We have it also from the Upper Lias of the Yeovil district. 



CHEMNITZIA PROCERA, Deslongchamps. 



1842. Melania procera, Desl. Mem. Soc. Linn. !N"orm. 



YII. pi. 12, fig. 5. (non 6.) 

 1850. Chemnitzia procera, D'Orb., Pal. fi\ TeiT. Jur. 2. 



Gast.pl. 239, figs. 2, 3, p. 41. 



