Plate IT 
Stagnicola catascopium kempi var. nov., Helisoma antrosa 
royalensis, and H. campanulata canadensis var. nov. 
Upper Row. Helisoma campanulata canadensis Baker and 
Cahn. Left figure, type; others, paratypes. Mus. Nat. 
Hist., Univ. 111., No. Z30721. Bamaji lake. 
Second Row. Helisoma antrosa royalensis (Walker). Bamaji 
lake. Mus. Nat. Hist., Univ. 111., No. Z30720. 
Lower Two Rows. Stagnicola catascopium kempi Baker and 
Cahn. Third row, left, type; others, paratypes. Mus. 
Nat. Hist., Univ. 111., Z30719. 
All figures enlarged two diameters. 
