EXPLANATION OF PLATES 

 Plate 1 



Figures 1 a, b. Nonion{?) umbilicatulum (Walker and Jacob). (After Walker and 

 Jacob.) 



2 a, b. N onion (?) crassulum (Walker and Jacob). (After Walker and 



Jacob.) 



3 a, b. Nonion depressulum (Walker and Jacob). (After Walker and 



Jacob.) 

 4-6. Nonion depressulum (Walker and Jacob). (After Heron- Allen 



and Earland.) X 90. West of Scotland. 

 7-11. Nonion pompilioides (Fichtel and Moll). Figs. 7a, b. (After 

 Fichtel and Moll.) Figs. 8a, b. (After H. B. Brady.) X 60. 

 West of Ireland. Figs. 9a, b. Off Ragged Key, Fla. 80 

 fathoms. X 100. Fig. 10. Off Ireland. X 80. Fig. 11. East 

 coast of United States. X 80. 

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