Palceozoic Bivalved Entomostraca. 411 



Fig. 5. The same. Right valve, somewhat damaged. 



Fig. 6. Beyrichia clavata, Kolmodin. Left valve. 



Fig. 7. The same. Right valve. 



Fig. 8. The same. Right valve. 



Fig. 9. The same. Left valve ; antero-ventral lobe hypertrophied ; pos- 



tero-dorsal angle broken. 

 Fig. 10. Beyrichia Bolliana., var. wnhonata, Reuter. Left valve. 

 Fig. 11. The same. Right valve. 

 Fig. 12. Beyrichia tuhercidata (Kloden). Old individual, damaged, the 



antero-dorsal portion having been crushed. 

 Fig. 13. Beyrichia tuherculata, var. spicata, uov., or possibly a veiy old 



individual of B. tuherculata (Kloden). Left valve, broken. 

 Fig. 14. Beyrichia tuherculata^ var. spicata, nov. Right valve. 

 Fig. 15. Beyrichia tuherculata, var. foliosa, nov. Left valve. 

 Fig. 16. The same. Right valve. 

 Fig. 17. The same. Extreme variation ; right valve. 



Plate XXIL 



[All the figures are magnified 15 diameters, excepting those 

 marked otherwise.] 



Fig. 1. Maerocypris Vinei, J. & H. «, carapace, showing the left valve ; 



b, edge view ; c, end view. 



Fig. 2. The same. Right valve, shorter specimen. 



Fig. 3. Pontocypris Mawii, J. & H. a, right valve; J, edge view of a 



valve ; c, end view of carapace. 

 Fig. 4:. Bursulella semiluna, i . rt, side view of carapace ; i, ventral edge ; 



c, end view. Magnified 30 diam. 



Fig. 5. Bursulella triangularis, J. Side view. Magnified .30 diam. 



Fig. 6. The same. Interior of valve. Magnified 30 diam. 



Fig. 7. Bursulella unicornis, J. Side view. Magnified 30 diam. 



Fig. 8. jFchmina bovina, J. Side view. Magnified 30 diam. 



Fig. 9. Thlipsura v-scripta, J. & H., var. discreta, J. a, side view of 

 carapace, showing right valve ; h, edge view. 



Fig. 10. The same. Left valve. 



Fig. 11. Leperditia grandis, Schrenck. a, I'ight valve, small, nat. size j 

 b, one of the marginal pits, magnified. 



Fig. 12. Frimitia Icevis, J. a, left valve of carapace ; b, edge view of 

 carapace. 



Fig. 13. Primitia stricta, J. a and h as above. 



Fig. 14. Primitia grandis, J. a, carapace, showing left valve ; b, ventral 

 view ; c, end view. Magnified 30 diam. 



Fig. 15. Primitia reticristata,i. a, carapace, showing right valve; J, dor- 

 sal view ; c, end view. 



Fig. 16. Entomis Lindstrcemi, J. a, left valve ; b, dorsal edge. Mag- 

 nified 5 diam. 



Fig. 17. Primitia seminulum, J. a, right valve ; b, dorsal view. 



2^^.18. Primitiujjsis pla7iifroiis,J. a, left valve; 6, dorsal view ; c, edge 

 view of carapace ; d, interior of left valve. 



Fig. 19. Primitiopsis jdanifrons, var. ventrosa, J. a, right valve ; 6, dor- 

 sal edge ; c, end view of carapace. 



Fig. 20. Entomis incequalis, J. a, right valve, probably somewhat short- 

 ened by pressure ; h, dorsal edge ; c, front end. 



