NO. 3 CUSHMAN AND MCCULLOCH: SOME NONIONIDAE 167 



EXPLANATION OF PLATE 20 



Figs. 



1, 2. Elphidium spinatum Cushman and Valentine, var. magiiifi- 

 cum Cushman and McCuIloch, new variety. X 60. 1, Para- 

 type. 2, Holot3'pe. a, side view; b, apertural view. 



3,4. Elphidium stimidum Cushman and McCulIoch, new species. 

 X 35. 3, Paratype. 4, Holotype. a, side view; b, apertural 

 view. 



5. Elphidium crispum (Linne). X 28. a, side view; b, aper- 

 tural view. 



6. Elphidium crispum (Linne), var. subcrispum Cushman and 

 McCulloch, new variety. X 45. a, side view ; b, apertural 

 view. 



7-10. Elphidium pustulosum Cushman and McCulloch, new spe- 

 cies. X 28. 7, Holotype. 8-10, Paratypes. aaaa, side views ; 

 bbhb, apertural views. 



11. Elphidiella hannai (Cushman and Grant). X 35. a, side 

 view ; b, apertural view. 



