208 



PUPILLIDAE AND RELATED GROUPS. 



Vertigininae. 



In this group, the anatomy of Columella edentula (Drap.) 

 was studied by Hanna (1912) and Vertigo pusilla Miill., anti- 

 vertigo (Drap.), substriata (Jeffr.), pygmaea (Drap.), moul- 

 insiana (Dup.) and alpestris Aid., Truncatellina rivierana 

 (Bens.) and C. edentula were dissected by Watson (1923). 

 Steenberg (1925) gave more careful accounts of all these 

 except V. alpestris and added V. (Vertilla) angustior Jeffr., 

 T. cylindrica (Fer.) and T. costulata (Nilss.) ; his figures of 

 the genitalia of V. pusilla (pi. 31, figs. 4, 5), T. cylindrica 

 (fig. 9) and C. edentula (fig. 8) are reproduced, also that of 

 the radula of C. edentula (text, fig. 12, 2). Male organs are 

 commonly absent. Oviparity prevails. 



^o 



<f^^^ 



o 



I i^^ 



Columella edentula Drap. 



XI 500 



\/\maIIID( 



'C=:^ 



Truncatellina monodon. 



Fig. 12. — 2, Columella edentula, after Steenberg. 3. Truneatellina 

 monodon, after Odhner. 



