PLATE X. 



Fig. 



1. Meyeria vedensis (p. 33). After a fine specimen, in Mr. Norman's collection, from 



Atherficld. 



2. The same species, from a specimen in the British I\Iuseum, showing, with other inte- 



resting details, the transverse articulation of the outer caudal plate, indicating 

 the astacoid relation of the genus. 



3. A beautiful example of the carapace of this species. 



4. A specimen, showing the structure and great length of the anterior legs. 



5. A fragment, with portions of the other legs. 



The last three figures are from specimens in Dr. Bowerbank's collection, and are from 



Atherfield. 



