PLATE I. 



TAGB 



Fig. 1. Parastrophia challengeri, de Folin, n. sp. . . . .681 



The shell, magnified 30 diameters. 



Figs. 2, 3. Strebloceras subannulatum, de Folin, n. sp. . . .682 



The shell seen in front and in back, magnified 25 diameters. 



Figs. 4-6. Watsonia elegans, de Folin, n. gen. and sp. . . .682 



The shell, magnified 25 diameters. , 



