46 DUNDET GASTEROPODA. 



curved lines ; base of last whorl slightly convex. The umbilicus 

 was probably closed, but our specimen is imperfect here. 



This differs from P. punctata by having rows of detached 

 tubercles instead of continuous tubercular lines, by the greater 

 angle of the spire, and convexity of base of last whorl. 



There is one specimen in the Museum. 



Locality — Dundry. ' Inf. Ool. 



PLEUROTOMAEIA DUNDRIENSIS, n. sp. PL 3, fig. 3. 



Height (if complete) 27 mm. Breadth 30 mm. Angle of 

 spire 75^. 



Shell depressed, conical; apex, acute; whorls about seven:, flat, 

 the older ones slightly rounded into the suture, while the upper 

 part of the shell is a straight-sided cone. The whole surface is 

 ornamented with strong spiral lines, these are crossed by transverse 

 ones fainter below the sinus-band, but above it they are so strong 

 that they appear as ridges, being also more oblique in direction. 



There is a narrow umbilicus ; sinus-band sub-median, slightly 

 salient, with the central line crossed by curved lines. 



The base of the last whorl is somewhat concave midway to the 

 umbilicus, around which are radiating and concentric lines. 



The species to which this comes nearest may be said perhaps 

 to be P. Myst's, D'Orb. 



There are two specimens in the Museum. 



Locality — Dundry. Jnf. Ool. 



PLETmOTOMAEIA SUBRETICTJLATA, D'Orbigny. Pi. 3, 



fig. 7. 



1849 P. subreticulata, D'Orb. Prod. 1, p. 260. 



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



Oast. pi. 392, figs. 1—5, p. 494. 



Height 30 mm. Breadth 27 mm. Angle of spire about 65*>. 



It is not quite clear whether there is an open umbilicus or not 

 in our specimens, but there seems to be a narrow one. In all 



