268 Prof. T. R. Jones aiid Mr. J. W. Kirkby on the 



Fig. 2. The same, a, left valve ; b, ventral view. 



Fiff. 3. JBytlwq/pns (?) cimeola, J. & K. o, right valve ; b, ventral view ; 



c, dorsal view. 

 Fig. 4. The same, a, left valve ; 6, end view. 

 Fig. 5. The same. Right valve, with postero-ventral spine. 

 Fig. 6. The same. Right valve, showing central spot. 

 Fig. 7. The same P (variety ?). a, right valve ; b, dorsal view. 

 Fig. 8. Bythocijims (?) cornigera, J. & K. a, left valve; b, dorsal view ; 



c, end view. 

 Fig. 9. The same. Right valve. 

 Fig. 10. Bythocypris (?) pynda, J. & K. a, left (?) valve ; b, ventral 



view ; c, end view. 

 Fig. 11. The same. Right (?) valve. 

 Fig. 12. Bythocypris (?) Moorei, J. & K. a, right (?) valve ; b, edge 



view ; c, end view. 

 Fig. 13. B]/thocypris (?) thraso, J. & K. «, right valve ; 6, dorsal view, 

 Fig.li. Cytherei?) gyriimnctaUt , J. & K. a, right valve; b, dorsal 



view. 

 i%. 15. Bythocypris hmata, J. & K. a, side view ; 6, edge view. 



Plate \ll. 

 [All the figures magnified ahout 25 diameters.] 



Fig.l. Lepe7-ditia Ar7nst7-ongiana, J. ScK. w, left valve, StorrMoss; b, 



dorsal view (cast), Law Quarry, Ayi-shire. 

 Fig. 2. Leperditia Bosquetiami, J. & K. a, left valve : b, dorsal view ; c, 



end view. Campbelltown. 

 Fig. 3. Leperditia Toungiana, J. & K. a, right valve ; b, ventral view ; c, 



dorsal view. Dairy, Ayrshire. 

 Fig. 4. Leperditia scotobwdigakiisis (Ilibbert). a, left valve ; b, dorsal 



view. West of Pittenweem, Fife. 

 Fig. 5. Leperditia2}arallela,J. ScK. a, right valve ; 6, edge view. Near 



Bristol. 

 Fig. 6. LejierditiaobesafJ.&K.. rt, left valve ;&, ventral view. Arnside. 

 Fig. 7, Leperditia comp)ressa, J. & K. a, left valve ; b, ventral view. 



Craigenglen. 

 Fig. 8. Lepei-ditia lovicensis, J. & K. a, left valve ; b, ventral view. 



Woodend, Lowick. 

 Fig. 9. Leperditia acuta, J. & K. Left valve. Arnside. 



Plate VIII. 

 [All the figures magnified about 25 diameters.] 



Fig. 1. Beyrichia radiata, J. & K. Right valve of a tuberculated variety. 



Cieol. Surv. Scotland Coll. B 2831 E. 

 Fig. 2. The same, a, left valve ; b, ventral view. I ^ pi. 

 Fig. S. Beyrichia longispina, J. & K. Left valve. ( ' c . 



Figs. 4 (fc5. Beyrichia fodicata, J. & K. Right valves, ) Linlithgow 

 Fig. 6. The same. Left valve. j Bridge. 



Fia. 7. Bei/richia tuberculospinosa, J. Si K. Left valve. T,r ^ , , 



i^l-. S: The same. Right valve. ^ [ Murrayfield. 



Fig. 9. Beyrichia muItUoba, J. & K. a, right valve ; b, left valve ; c, 



ventral view. Mouse Water, Wilsontown. 



