TAB. XI. 



Fig. 



1. Rissoa striata, y>(7yc' 100. 



a. front view. 



b. back view. 



2. Paludestrina subumbilicata, yj. 108. 



a. front view. 

 h. back view. 



3. Rissoa vitrea, />(. 102 



a. front view. 

 h. back view. 



4. Rissoa punctura (r), yy. 103. 



a. front view. 

 h. back view. 



5. Rissoa reticulata (?),y;. 103. 



a. front view. 



b. back view. 



6. Rissoa confinis, /». 104. 



a. front view. 



b. back xdew. 



Fig. 



7. Rissoa Zetlandica, />. 101. 



a. front view. 



b. back view. 



8. Rissoa supracostata, jO. 107. 



a. front view. 



9. Rissoa pulchella (?),y;. 104. 



a. front view. 



b. back view. 



10. Rissoa semicostata, y;. 102. 



11. Rissoa obsoleta, yy. 105. 



a. front view. 



b. back view. 



12. Rissoa costulata,/;. 106. 



a. front view, var. a. 

 3. front view, var. /3. 



13. Rissoa crassi-striata, y;. 106. 



b. front view. 

 a. back view. 



The line>s Indicate the size of the specimens. 



