TRUNCATELLINA. 63 



but the ribs are larger and more spaced there. The aperture 

 is toothless. 



2. TRUNCATELLA ATOMUS (Shuttle worth). 



Shell very minute, rimate, cylindric, obtuse, very elegantly 

 and finely costulate, thin, pellucid, corneous. Whorls S 1 /^, 

 convex, the last nearly one-third the total length. Aperture 

 oblong, toothless; peristome very delicately reflected, the 

 superior margin obtusely angulate, columellar margin dilated. 

 Length scarcely over l 1 /^, width % mm.; aperture about ^ 

 mm. long (ShuttL). 



Canary Is.: Teneriffe, found under leaves (Blauner). 



Pupa atomus SH., Diagn. neuer Moll., i, p. 10, in Mittheil. 

 Bern., 1852, p. 144. - - PPR., Monogr., iii, 532. WOLLASTON, 

 Testacea Atlaiitica, 1878, p. 448. 



"Near to P. minutissima [T. cylindrical, but smaller, 

 sharply costulate and with fewer whorls" (Shidtl.). It needs 

 comparison with the small form of T. linearis of Madeira. It 

 is known by the original account only. 



3. TRUNCATELLINA MOLECULA (Dohm). 



Shell very minute, deeply rimate, cylindric, obtuse, slightly 

 striatulate, pellucid, corneous. Whorls 4 to 5, convex, the 

 last about % the length. Aperture subcircular, toothless; 

 peristome a little reflected, the right margin arcuate above. 

 Length scarcely 2, diam. 0.8, diam. apert. 0.75 mm. (Dohrn). 



Cape Verde Is. : S. Antao. 



Pupa moledila DOHRN, Malak. Bl., xvi, 1869, p. 13. PFR., 

 Mouogr., viii, 362. WOLLASTON, Testacea Atlantica, 1878, p. 

 512. 



Nearly related to Pupa minutissima and P. atomus Sh., but 

 differs from both by the nearly smooth shell as well as by the 

 somewhat more rapidly increasing whorls, giving the last a 

 different ratio to the shell length. In collecting the small 

 Pupa?, w^hich were all covered with hard dirt, I at first over- 

 looked this sjiecies, and only about 20 specimens were after- 

 wards found (Dohrn). 



There is an unexplained discrepancy in the accounts of 



