EXPLANATION OF PLATE XLIV. 



OSTKEA BRYANA Galjb, p. 448 



1-2. Views of two lower valves. 



3. View of the upper side of a complete individual. 



4. View of the interior of an upper valve. 



ilaiiasqiian marl; near Vinceiitoivn, (l^g). 



5. An uitcrnal cast. 



Maiiasquaii marl: Faniiiiigdali', UsS). 



CkyphaEostrea vomer (Morton) p. 455 



6-9. Views of three lower valves of different forms, and one upper 

 valve. 



Alarshalltoicn clay-iiiart; near Siccdcsboro, (177). 

 lo-ll. Views of a lower and an upper valve. 



Hornerstoivn marl; near ]Voodstoivn, (iSi). 



970 



