EXPLANATION OF PLATE XXIII. 



Fig, 11. Rissoina lintea, Hedley and May. 



12, 13. Pseutlormoina capiticava, Hedley and May. 



14. Septa petvlans, Hedley and May. 



15. Gymatium columnarium, Hedley and May. 



16. Arcidaria mob! lis, Hedley and May. 



17. ,, ,, var. costata, Hedley and May. 



18. Natica elkingtoni, Hedley and May. 



19. Marginella columnaria, Hedley and May. 

 "20, 21. Microvoluta purpureostoma, Hedley and May. 



