612 PLIOCENE MOLLUSCA. 



1886. Bissoa (Alvania) curfa, Dollfus et Dautzenberg, Feuille Jeunes Natur., vol. xvi, p. 15. 

 1890—95. Bissoa curfa, var., Sacco, Boll. Soc. Geol. Ital., vol. Ix, p. 325, uo. 5343, 1890; Alvania 



curia, Moll. Terr. Terz. Pieiii.. pt. xviii, p. 23, 1895 

 1893—98. Bissoa intusstriata, A. Bell, Proc. Eoy. Irish Acad. [3], vol. ii, p. 629, 1893; B. curta, 



Trans. Roy. Geol. Soc. Cornwall, vol. xii, p. 151, pi. ii, fig. 8, 1898. 

 1919. AhHinia curta, Cossmaiin et Peyrot, Actes Soc. Linn. Bordeaux, vol. iii, \)i. ii, p. 582, pi. xvii, 



figs. 43—46. 



Specific CJ/araclers. — Shell small, fairly solid, ovato-conical ; spire rather short ; 

 whorls 6, slightly convex, the last much the largest ; ornamented bj about twelve 

 strong costse which extend nearly to the base of the shell, and by very fine 

 spiral strige; mouth ovate; outer lip thickened without, distinctly ridged within; 

 umbilicus distinct. 



Dimensions. — L. 4*5 mm. B. 2 mm. ■ ■ 



Distribiitiov. — Not known livino-. 



o 



Fossil : St. Erth. 



Miocene : Touraine, Vienna l)asin, Italy — Tortoniano. 



Boiuii-lrs. — One of the specimens here figured was found by Mr. Bell at St. 

 Erth. It was originally described by himself and Mr. Etheridge as a new species 

 under the name of Ii. iidusstrinta, but has been since referred by the former to the 

 R. carta of Dujardin. If tiiis identification is correct it is not only interesting, but, 

 as bearing upon the probable age of the St. Erth beds, important; 11. curta is an 

 extinct form, having had a wide distril)utioii in Miocene times, but I cannot find 

 that it has been recorded otherwise from any Pliocene hori/on. 



Alvania partim-cancellata (S. V. Wood, MS.). Plate LI, figs. 26, 27. 



1886. Bissoa partim-canceUaia, S. V. Wood in Kendall and R. G. Bell, Qnart. Journ. Geol. Soc, 



vol. xlii, p. 211. 

 1893—98. Bissoa jmrtim-cancellaf a, A. Bell, Proc. Roy. Irish Acad., vol. ii, p. 629, 1893; B. Lanciee, 



Trans. Roy. Geol. Soc. Cornwall, p. 151, pt. ii, fig. 7, 1898. 



Specific Characters. — Shell minute, ovate; whorls 5, slightly convex, regularly 

 diminishing in size upwards, the last nuich the largest; spire about one-third the 

 total length ; ornamented by numerous longitudinal costse disappearing towards the 

 periphery against a series of spiral ridges which continue to the base of the shell, 

 with a single line near the suture; suture slightly channelled; mouth oval. 



Dimensions. — L. 3 mm. B. P5 mm. 



Distribution. — Not known living. 

 Fossil : St. Erth. 



BemarJcs. — This interesting little fossil, belonging to the Warburton Collection 

 at the British Museum of Natural History, where it has been referred in error to 



