PLATE XLIV. 



Fig. 1. Rissoa (Alvania) didyma, n. sp. . 

 a. The natural size. 



Fig. 2. Rissoa [Alvania) tarsodes, n. sp. 

 a. The natural size. 



Fig. 3. Rissoa [Alvania) lusciniw, n. sp. 



a. The natural size. 



Fig. 4. Rissoa pyrrhias, n. sp. 



a. The'natural size. 



b. The shell, enlarged. 



Fig. 5. Rissoa xanthias, n. sp. . 



a. The natural size. 

 6. The shell, enlarged. 



Fig. 6. Rissoa {Alvania) trajectus, n. sp. 

 a. The natural size. 



Fig. 7. Rissoa fay alensis, n. sp. 



a. The natural size. 



Fig. 8. Rissoa amblia, n. sp. 



a. The natural size. 



Fig. 9. Rissoa pernanibucensis, n. sp. 

 a. The natural size. 



Fig. 10. Rissoa microstoma, w. sp. 

 a. The natural size. 



Fig. 11. Rissoa (Cingula) rustica, n. sp. . 



a. The natural size. 

 6. The shell, enlarged. 



Fig. 12. Rissoa (Setia) marionensis, n. sp. 

 a. The natural size. 



Fig. 13. Rissoa (Setia) principis, n. sp. 

 a. The natural size. 



| b. The shell, enlarged. 



| b. The shell, enlarged. 



| b. The shell, enlarged. 



c. The apex, magnified 70 diameters. 



c. The apex, magnified 70 diameters. 



b. The shell, enlarged. 



b. The shell, enlarged. 



b. The shell, enlarged. 



b. The shell, enlarged. 



| b The shell, enlarged. 



c. The apex, magnified 45 diameters. 



b. The shell, enlarged. 



&. The shell, enlarged. 



PAGE 



594 



. 595 



597 



588 



588 



596 



589 



590 



590 



591 



604 



607 



608 



