PLATE XVII. 



Figure 1. Variinvlina legvmen (Linnaeus) D'Orliigny var. chgans (]>'Oii)ip:ny) Foniasini? Basal five chambers of an 

 incomplete specimen. >< 100. 



2. Polymorphina hymiuniris C'ushman, n. sp. a, View of one side; h. opposite siile. X 60. 



3. Polymorpkina gibba Z)'()r]>igny. Young specimen. >' 120. 



4. Ehrenbenjiiia glabnthi Cushmau, n. sp. a, Ventral \iew; b. ilorsal view; c, side view. X 120. 



Ill 



