352 



PROE. T. E. JONES ON" THE OSTEACODA 



Fig. 



2. 

 .3. 



10. 



11. 

 12. 

 13. 



14. 

 15. 

 16. 

 17. 



18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 



Plate IX. 



Cypris ^urhecJcensis, Forbes. Inside \ Lower Purbeck ; 1 

 of left valve J Vale of Wardour. J 



— ^ . Right valve ,, „ 



(reniform variety). Left 1 Lower Purbeck ; "[ 



valve J Harfcwell. J 



-n,-! • c r Lower Purbeck:! 



. Edgeview of carapace... I Vale of Wardour. ' | 



. Leftvalve { ^"Zitchuri":'^"' 1 



. Eight .alve(aick) { lo-|„^,, ^-l>-^^} 



Candona hononiensis, Jones. Eight ] Lower Purbeck ; 1 

 valve J Hartwell. J 



. Edge of valve „ „ 



Candona ansata, Jones. Left valve, 



inside ,, „ 



Tj- 1 , 1 „ /Lower Purbeck: 



. Right valve I South Oving, 



. Edge view of valve ,, ,, 



. Left valve ,, „ 



Cythere transiens, Jones. Left valve, 1 Lower Purbeck ; 



inside J Swindon. 



. Right valve, inside ,, „ 



. Carapace ventral view .. . ,, „ 



. Left valve „ „ 



Cythere retirugata, Jones, var. rugu- 1 Lower Purbeck ; 1 



lata, Jones. Left valve J Hartwell. J 



. Left valve, inside „ „ 



. Carapace, ventral view .. . „ „ 



. Right valve, inside „ ,, 



Cythere retirugata, Jones. Left valve „ „ 



. Carapace, ventral aspect ,, „ 



. Right valve, inside „ „ 



, var. textilis, Jones. Right 



valve „ „ 



]S-o.of 

 Specimen. 



(diam.). 



230,6 



20 



230,2 



20 



350,3 



20 



230,1 



20 



227,1 



20 



'OunniTigton,3"20 



353,1 



20 



353,2 



20 



269,11 



30 



363,3 



30 



363,2 

 363,4 



30 

 30 



964,8 



40 



364,0 

 364,7 

 364,2 



40 

 40 

 40 



256,2 



30 



256,4 

 269,5 

 258,6 

 253,8 

 253,2 

 253,11 



30 

 30 



30 

 30 

 30 

 30 



166,1 



30 



DiSCFSSION. 



Prof. Blae:e thought that the Purbeck beds of Swindon were con- 

 temporaneous with the Portlandian further south, and that this 

 view was confirmed by the mingling of marine and freshwater 

 forms. 



Dr. HrsTDE pointed out that the name of Darwinella had been 

 akeady employed by Pritz Miiller for a genus of horny sponges. 



Mr. Whztaxee asked for further information as to the species of 

 Ostracoda being characteristic of the several divisions of the 

 Purbeck. 



Br. WooDWAED pointed out the necessity of indicating the dorsal 

 and ventral aspects of all the forms, so as to facilitate their com- 



