NEWTON : NEW BRITISH EOCENE GASTROPODA. 329 



obscure cicatrice, observable on one side of the shell only, indicates 

 the right position of this species to be among the true EuUmce, and 

 not with ISubularia of Monterosato { = Leiostraca, H. and A. Adams), 

 which is characterized by the presence of a cicatrice on each side of 

 the spire. This shell is well represented in the British Museum. 



Formation. — Upper Eocene (Barton Beds). 



Localities. — Barton and High Cliff (type), Hants. 



EuxiMA POLiTissiMA., n.sp. PI. XXII, Figs. 9, 10. 



Eulima pohjgyra, Charlesworth MS., Morris, Cat. British Fossils, 

 1854, ed. 2, p. 247, non A. Adams, 1850 ; Lowry, 

 Etheridge, and Edwards, Chart Characteristic British 

 Tertiary Fossils, 1866. 

 Eulima, sp., R. B. Newton, Syst. List Edwards Coll. British Museum, 

 1891, p. 184. 



Shell narrowly elongate, smooth, porcellanous, with about twelve 

 whorls ; spire long, acuminate, slightly flexuous, with an obscure varix 

 on one side ; last whorl rounded, remainder flattened ; suture distinct 

 and rather oblique; aperture narrow and acutely ovate; base moderately 

 effuse ; columella border reflected, nearly parallel with axis of shell ; 

 labrum obtuse, subemaiginate behind, centrally dilated. Dimensions : 

 alt. 6"5mm. ; diam. max. l'5mm. 



The new species here described has hitherto been listed under the 

 MS. name of Eulima polygyra, but that having been used by A. Adams 

 for another shell, it is now changed to E. politissima. It resembles 

 both E. munda, Desh., and E. tun/idula, Desh., from the French 

 Eocenes, though differing from the former in its curved and 

 subemarginate labrum ; whilst from the latter it is separable on 

 account of its more slender and narrow form, more elongate terminal 

 volution, and its larger number of whorls. 



This is evidently a fairly common species, several examples being 

 known. 



Formation. — Upper Eocene (Barton Beds). 



Localities. — Barton and High Cliff (type), Hants. 



Alvania Bartonensis, n.sp. PI. XXII, Figs. 11, 12. 



Rissoa Barto7iensis, Charlesworth MS. 



Hissoina Bartonensis, Lowry, Etheridge, and Edwards, Chart Cha- 

 racteristic British Tertiary Fossils, 1866. 

 Rissoa Bartonensis, Charlesworth MS., R. B. Xewton, Syst. List 

 Edwards Coll. British Museum, 1891, p. 231. 



Shell small, perforated by a thin umbilical chink situated behind 

 the columella, globose, turbinate ; consisting of five or six ventricose 

 and deeply sutured whorls ; apex obtuse ; aperture ovate, entire ; 

 outer lip dilated and thickened marginally by an external varix ; 

 surface ornamented with an extremely tine cancellatc structure, 

 except on the two initial whorls, where it is smooth. Dimensions : 

 alt. 2"5, diam. 1*5 mm. 



This shell was originally recognized under the genus Rissoia, but 

 it is here regarded as belonging to Risso's Alvania, because of its 



