DUN DRY GASTEROPODA. 21 



appearance of a ridge all down the shell. On the last whorl of 

 one specimen are seen two spines, one below the other, the upper 

 one stronger. The surface is ornamented with fine longitudinal 

 lines, and somewhat stronger wavy transverse ones. 



It is much more acute than Alaria longisinna^ Desl. sp., and 

 the position of the keel would distinguish it. 



There are eight specimens in the Museum. 



Locality— Dundry. Inf, Ool. 



ALAEIA PEEEIERI, Piette. 



1864 Alaria? Perrieri, Piette, Pal. fr. Terr. Jur. 3, Gast. 



pi. 1, figs. 10, 11, p. 28o 



We do not put forward this identification as more than 

 provisional. Our shell has markings more like a Fusus than the 

 other species, viz., strong transverse costae, which are crossed by 

 raised longitudinal lines. Columella straight, as far as that part 

 of it which is preserved is concerned. No spines seen. 



We have only two specimens, both fragmentary. 



Locality — Dundry. Inf. Ool. 



ALAEIA LOEIEEI, D'Orbigny. 



1847 Pterocera Lorieri, D'Orb., Prodrome I., p. 270. 



1850 D'Orb., Pal. fr. Terr. Jur. 2 



Gast., pi. 429, figs. 7—10. 



1864 Alaria Piette, Pal. fr. Terr. Jur, 3 



Gast., pi. 2, figs. 12—14, 

 and pi. 4, figs. 1—3, p. 32. 



"VVhorls with an acute keel; there are numerous strong spiral 

 or longitudinal lines, which become a little less close together 

 near the suture: the last whorl has two keels; the whorls meet 

 with a circular sweep, the continuity of which is scarcely broken 

 by the suture. Our specimen does not show the entire columella, 



