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ERRATA. 



Page 11. After 36 A. ADAMSI Pils., read Achatinidce pi. 26, figs. 12, 13. 



Page 57. 12. B. OBESULA Pils. new name for Cyl. obesa. W. et M. , not of 

 C. B. Adams, xv, 124. 



Page 105. The reference to no. 48e, B. alba var. striatula, is Contrib. to 

 Conch, no. 2, p. 21 (1849). 



Page 120. Top line should read : Shell wider, diam. more than one-third 

 the length. 



Page 187. The genus PAL^EOSTOA Andrsee (1884) includes Danien species 

 which seem to have essentially the characters of the later (Eocene) group 

 Eomegaspira. This carries the group into the Mesozoic. I was not aware of 

 the existence of Palceostoa when Eomegaspira was proposed. See also H. 

 Nicolas, Asso. Franc. Avan. Sci. 26 session, St. Etienne, 1897, p. 360. 



