56 LAURIA. 



slope of the Simplon, type loc). — Paulucci, Bull. Soc. Malac. 

 Italiana, viii, p. 280, with var. dilucida, p. 281 (both from 

 Osini and valley of Taequisara, Sardinia) ; Materiaux Faune 

 Malac. Italie, 1878, p. 10 (dist. in Italy). — Pini, Bull. Soc. 

 Malae. Ital., ii, p. 164 (localities in the Esino district). — 

 Boettger, Jahrb. D. malak. Ges., viii, p. 228 (Kutais, Trans- 

 caucasia). — Odosiomia sempronii Charp. Clessest, Mollusken- 

 fauna Oesterreick-Ungarns, 1887, p. 253, f. 153, with var. 

 dilucida, p. 254, f. 154 (Tyrol). — Pupilla sempronii Charp., 

 Locard, Ann. Soc. Agric. Lyon (7), iii, 1895, (1896), p. 215. 

 — Lauria sempronii Charp., Kobelt, Iconogr. n. F., viii, p. 70, 

 pi. 231, f. 1486. 



Pupa sempronii var. edentula Gredler, Pfr.-Cless., Nomencl. 

 Hel. Viv., p. 353, as synonym of P. dilucida. 



Pupa dilucida Ziegler, Rossmaessler, Iconogr., i, pt. 5, 

 1837, p. 15, f. 326.— Pfr., Monogr., ii, 304.— Dupuy, Journ. 

 de Conch., xxv, 18 (descr. of living animal). — Pupilla dilucida 

 Ziegl., Locard, t. c, p. 216 (le Midi, Gers, Herault, Haute- 

 Garonne, Gironde, Alpes-Maritimes). 



Helix vallisnerii de Stefani, Bull. Soc. Malac. Ital., v, 1879, 

 p. 39 (immature stage). 



It is much smaller than any form of cylindracea, more deli- 

 cate and transparent, and with only a very small angular 

 lamella, which sometimes continues as a delicate thread a third 

 of a whorl inward, but more frequently the thread is shorter 

 or wanting. It has a columellar lamella in the young, but 

 none is visible in adult shells examined from France, Switzer- 

 land (Lausanne), Lombardy and the Tyrol. 



De Stefani described the immature stage as having spirally 

 entering columellar and parietal lamella?, with raised, trian- 

 gular denticles, not very distantly spaced. 



Like cylindracea, the specimens of any lot may vary re- 

 markably in length. The toothless variety dilucida is said to 

 occur with sempronii in some places, but some authors have 

 regarded it as a distinct species. I cannot decide upon its 

 status. 



L. sempronii dilucida (Zgl., Rossm.). PI. 7, fig. 4. 



Aperture toothless. The length is given as iy 2 , width % 

 lines. Type locality, Maultaschen Hohle in the Tyrolese Alps, 

 discovered by Stenz, jr. ; reported also from many places 



