PUNCTURELLA. 457 
figured by Morris and Lycett (Great Oolite Moll., pt.i, p. 87, pl. viu, fig. 3), but iS 
more compressed, more sharply angular, and quite devoid of the intermediate ribs 
in the intercarinal grooves. 
There are three specimens from the Leckhampton freestones in the Brodie 
Collection. 
Genus—PoNoTURELLA, Lowe, 1827. 
Shell conical, elevated, apex slightly recurved ; perforation in front of the apex, 
small ; interior exhibiting a raised border behind the aperture, and on a level with the 
apex; external surface cancellated. 
Mons. Cossmann was probably one of the first to point out that the Jurassic 
forms hitherto referred to Fissurella might with more justice be assigned to 
Puncturella, I have already stated that no true Keyhole Limpet has been seen 
by me from the Jurassic Rocks. 
401. Ponorurenta acura, Deslongchamps, 1842. A micromorph, Pl. XLI, figs 19 a, 
NOG AOre. 
1812. Fissurerua acura, Deslongchamps. Mém. Soc. Linn. Norm., vol. vii, 
p- 122, pl. vii, figs. 22—24. 
1851. — — — Morris and Lycett, Great Ool. Moll, 
pt.i, p. 85, pl. vil, fig. 5. 
1885. Puncorvrenta acuta, Deslongchamps. Cossmann, Etage Bathonien, p. 344, 
pl. vi, figs. 25 —27. 
Description.—The length of the figured specimen is about 2 mm., width and 
height a little less. The base is nearly circular, the apex subcentral. Radial 
cost are numerous and close, and decussated by finer transverse lines, the points of 
intersection being marked by small rounded granulations. The perforation appears 
to be a little in front of the apex, and very narrow. The internal border or septum 
is distinctly visible in the figured specimen. 
Relations and Distribution—These micromorphs from the Peagrit of Leck- 
hampton possess such a general resemblance to Deslongchamps’ species that this 
identification seems legitimate. There are four specimens in my collection, all 
about the same size. 
