30 PROF. T. E. JONES ON SOME PALEOZOIC OSTRACODA 



Figs. 12-16. Bci/richia ciliaia, Emmons. 12 a., left yalve ; h, ornament, X 70 

 diara. : 13 a, left valve; A, ornament, x70 diam. : 14 a, left 

 valve ; h, ornament, x70 diam. : 15 a, right valve ; i,end view: 

 16, inside of left valve. 

 17. Leperditia Claypolei, sp. nov. a, left valve ; b, end view ; c, edge 

 view. 



18.19. Primitia minuta (Eichwald). Left valves; 18, inside ; 19, out- 



side of a poor specimen. 



20. Leperditia hudsonica (?), Hall. Inside of valve. 



21-23. Primitia minuta (Eichwald). 21, left valve (true shape) ; 22, 

 right valve ; 23, right valve. (These are from Talkof, Russia.) 



24. Primitia Whitfieldi, sp. nov. a, right valve ; h, ornament, X 



70 diam, 



25. Beyrichia Buchiana (?), Jones. Left valve, not well preserved. 



Plate TV. 



Silurian Ostracoda. 



[All the figures are magnified 15 diameters, except figs. 1 a and 6 a, which 

 are X 40 diameters.] 



Figs. 1-3. Primitia TJlrichi, sp. nov. 1 a, right valve, x40 diam. ; h. outline 

 of the same ; c, edge view : 2, left valve of a variety ; 3, right 

 valve of another var. (All these are from the "Utica Slate" 

 of Canada.) 



4. Leperditia nana (?), Jones. Right valve. 



5. Primitia himilis, J. & H., var. humilior, nov. Right valve. 



6. Primitia Morgani,sp.n.oy . a, left valve, X 40 diara. ; 6, the same, 



X 15 diam. 



7. Primitia mimdula, Jones, var. camhrica, nov. Right valve. 

 8-13. Primitia unicornis (Ulrich), and varieties. Fig. 10 is a right 



valve ; the other figures are left valves. 



(Figs. 4-13 are from the Bala Beds near Welshpool, Mont- 

 gomeryshire.) 



14, 15. Xestoleheris Wrightii, sp. nov. 14, carapace, with the left valve 

 outwards: 15 a, carapace, right valve seen; b, edge view; 

 c, end view. (From the Chair of Kildare, Ireland.) 



16-18. Beyrichia ciliatn , 'E.mmom. 16 a and ^, edge and end views of 

 fig. 12, PI. in. ; 17 a and b, of fig. 13; and 18 a and b, of 

 fig. 14. 



19. 20. Beyrichia oculifera, Hall. 19 a, left valve ; b, edge view of the 



same : 20, inside of a right valve (the boss injured). 



21. Beyrichia Hallii, sp. nov. Right valve. 



22, 23. Kloedcnia notata (Hall). 22. right valve ; 23, left valve. 

 24. Kloedenia notata, var. ventricosa, Hall. Left valve. 



(Figs. 16-24 are from the United States.) 



Discussion. 



The President asked whether the Author had seen the originals 

 of the specimens from which the American drawings had been 

 made. He cited several instances showing the errors which had 

 arisen from describing forms from drawings onlv. 



Dr. Woodward commented upon the care the Author had taken 

 in describing these Ostracods, and the long time he had held his 

 work over whenever he felt any hesitation concerning his conclu- 

 sions. He felt sure that the Author had not described his new 

 forms without the greatest care having been taken to exclude the 

 possibility of error. 



