64 TRUNCATELLESTA. 



Dohrn and Wollaston as to the sculpture. Wollaston writes 

 as follows of specimens received from Dohrn : * ' The extremely 

 minute size and linear outline of this little Pupa, added to 

 its remarkably convex or tumid volutions (which are coarsely 

 and very obliquely striated), its thin substance, its pale 

 whitish-brown, or almost brownish- white, hue, and but slightly 

 shining surface, and its perfectly edentate aperture, will pre- 

 vent it from being confounded with any other member of the 

 genus from at all events the Cape Verde archipelago. It 

 possesses, however, a peculiar interest geographically from 

 its being so nearly allied to a subfossil species, the P. linearis 

 Lowe, from Madeira, which has not yet been met with in a 

 recent state, that before I had made close comparison I 

 thought it most probable that the two would prove to be iden- 

 tical. However, although so intimately related, I feel sure, 

 after an accurate examination, that they must be treated 

 practically as distinct ; for not only is the P. molecula, on the 

 average, a trifle larger and broader than the linearis, but its 

 volutions are perhaps even still more tumid, its suture is more 

 oblique, or less horizontal, and (which is the most important 

 of all) its aperture is appreciably larger and more developed." 



II. SPECIES OF EUROPE, NORTH AFRICA AND NEARER ASIA TO 



THE WESTERN HIMALAYAS. 



Key to species of Northern Africa, Europe and Western Asia. 



1. Aperture without teeth 2. 



Aperture having teeth (sometimes deeply immersed) . . 6. 



2. Almost smooth, the striae very minute; 1.25x0.5 mm., 6 



whorls ; Triest to Hungary f. laeviuscula, no. 6. 



Surface rib-striate 3. 



3. Shell slightly wider above ; 1.5 mm. long 4. 



Shell tapering slightly upward; 2 mm. long, 7-8 whorls; 



Transcaucasus T. micula, no. 8. 



Shell cylindric ; length 1.5 to 2.2 mm 5. 



4. Five whorls; closely rib-striate; Tunis. T. doumeti, no. 5. 

 Six whorls ; sharp, spaced ribs ; Athens, Palestine. 



T. rothi, no. 7. 



