Plate VII. 



The Fusus rostratus Series. 



(All the specimens are in the collection of the Museum of Comparative 

 Zoology at Cambridge. The illustrations are slightly reduced.) 



a. Pliocene. 



Page. 

 Figs. 1-3. Fusus bredce, showing progressive variation (1452, 1453, 1452)... 60 

 4-10. Fusus rostratus, showing principal varieties (1449, 27805, 1449, 



1450, 1448, 1450, 1450) 58 



b. Recent Species. 



Page. 



II. Fusus fragosus? (926) 62 



12 and 13. Fusus fragosus (922) 62 



14. Fusus rostratus var. carinatus (923) 63 



15 and 16. Fusus rostratus (923, 924) 63 



17. Fusus ccclatus? (925) 65 



(170) 



