44 DTJNDRT GASTEROPODA. 



PLETJEOTOMA.RIASUBDECOEATA,Miieiister, (? nonD'Orb.) 



1844 P. subdecorata, Mii. Goldf. Pet. Germ., tab. 185, 



fig. 3. 



Height, 37 mm. Breadth, 38 mm. Angle of spire, 80® 



Eeferred with great doubt to Muenster's species, of which it 

 has a similar form and markings, but the . umbilicus is wide and 

 deep, so that it differs entirely from D'Orbigny's description. 



The cancellated character of the ornamentation is best 

 preserved on the young whorls, which are obtusely subangular ; 

 the older whorls are convex and less .angular. The sinus-band is 

 slightly below the middle of the whorl ; it is convex, with 3 — 4 

 raised longitudinal lines, crossed by the usual curved- lines.' The 

 base is convei, sloping steeply into the deep umbilicus. 



Oppel (Juraf. p. 259) cites the species from the Upper Lias, 

 and considers D'Orbigny's shell the same species. It is for those 

 who have access to the German type to decide. 



There is only one specimen in the Museum. 



Locality — Dundry. Inf. Ool. 



PLEUROTOMAEIA MOI^TICTJLUS, Deslongchamps. 



1848 P. Monticulus, Desl. Mem. Soc.Linn. deNorm. 



YIII. pi. 13, fig. 5, p. 143. 

 1850 :..... D'Orb. Pal. fr. Terr. Jui\ 2, Gast. 



pi. 388, figs. 6—10, p. 485. 



Height 25 mm. Breadth 25 mm. 



Our specimen agrees fairly with the French description. 



The outline of the spire is an obtuse cone bounded by curved 

 lines ; whorls convex, with oblique costae on the upper part of 

 whorl, crossed by longitudinal lines ; the umbilicus is deep ; the 

 base is imperfect, but there is evidence of radiating ridges ; the 

 sinus-band is concave, and crossed by curved lines only. 



There is one specimen in the Museum. 



Locality — Dundry. Inf, Ool. 



