34 PLIOCENE MOLLUSCA. 



remarking that though it bears a superficial resemblance to the Recent species 

 generally known as P. umbilicatus, Mull., it may be distinguished from it ; it is 

 smaller, the rate of increase in the whorls is less, the carina tion is not so 

 prominent, and it is perfectly smooth, lacking the characteristic stride of the 

 latter species. The shell figured by Wood is not more than two-thirds the size 

 of the one now described. 



Genus PALUDESTRINA, D'Orbigny, 1841. 

 Paludestrina Reevei, Kennard and B. B. Woodward. 



1879. HyJrobia obtusa, S. V. Wood, Mou. Crag Moll., 2nd Suppl., p. 30, pi. iv, fig. 7. 



1899. Paludestrina Meevei, Keunardaud B. B. Woodward, Proc. Malac. Soc, vol. iii, p. 198, fig. 2. 



Specific Characfers. — Shell minute, ovato-conical ; apex obtuse ; base obliquely 

 rimate ; whorls 4, smooth, rather convex, the last but slightly inflated, about two- 

 thirds the total length ; mouth oval, oblique, acutely angulate above ; peristome 

 simple, continuous ; columella nearly straight, slightly reflected. 



Dii)iensions. — L. 2 mm. B. 1 mm. 



Bistrihntion. — Not known living. 



Fossil : Icenian Crag : Blake's Pit, Bramerton. 



Bemarlcs. — Of this miniite shell, only known at present from one locality, there 

 are about a dozen specimens at the British Museum (Nat. Hist.) and Norwich 

 Museum, which were found some years ago by Mr. Jas. Reeve at Bramerton. 



They were originally identified by Wood, though apparently with some doubt, 

 with an Oligocene and Lower Miocene species, Bithynia obtusa of Prof. Sandberger, 

 to which they bear a close resemblance. Messrs. Kennard and B. B. Woodward, 

 however, comparing them with some specimens from Germany, have come to the 

 conclusion that they are distinct. They state their reasons for this, giving 

 enlarged representations of the foreign and British shells in the paper above- 

 named, to which reference should be made. 



■ Ge7ms LITHOGLYPHUS, Megerle von Miihlfeldt, 1818. 



Lithoglyphus fuscus (Pfeiffer). Plate J, fig. 16. 



1828. Paludina fusca (Ziegler MS.), Pfeiffer, Naturgesch. Deutscli. Laud Siissw. Moll., pt. iii, pi. viii,. 



fig. 5. 

 1851. Liiliogltjphns fuscus, S. P. Woodward, Man. Moll., p. 138, pi. ix, fig. 22. 

 1885. LithoijIypJms fuscus, Westerlund, Faun. Palsearct. Eeg., pt. ii, p. 87. 

 1890. Lithoglyphus fuscus, C. Eeid, Plioc. Dep. Brit., pp. 184, 186, 220, 229, pi. v, fig. 9. 



