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EXPLANATION OF PLATES. 



Plate I. 



Deibija multistriata (Meek). 



1. a. b. c. Reproduced from de Konlnck's. pi. XIII, f. 7, a, b, c. 



2. Figure 7a. pi. XIII bis. of de Koninck. These specimens are called 

 "Orthis uuibraculum" by him. but are very different from those figured by 

 Bronn, from the Devonian of Eiffel, after examining Schlotheim's types. 



.3a. Specimen below average size, but possessing an unusually high 

 hinge area whicli is symmetrical, posterior view. 

 .3b. Lateral profile of same specimen. 

 All figures natural size. 



