OP THE PUR BECK FORMATION. 335 



2. Synoptical List of the Ostracoda of the Purheclc and Wealden 

 Formations in England, showing their Stages and Recun^ence. 

 (Successively numbered, 1—20, upwards from those of the Lower 

 Purheclc.) 



Wealden Species (11 species, 5 of which come up from the 

 Purbeck, Upper and Middle). 



14. Cypridea valdensis (Fitton). Yeiy rare in Mid-Purbeck, but 



very abundant here. 

 13. DunheH, nov. 1 Eecurrent from the Purbeck 



10. tuhercidata (Sowerby). J beds. 



20. spimgera (Sow.). 



19. hispinosa, Jones. 



18. dorsispinata, nov. MS. 



17. gyripunctata, nov. MS. 



16. aculeata, nov. (part of verrucosa, Jones). 



15. Cythere Fittoni (Mantell). Common. 



8. Cyprione Bristovii, nov. ) Recurrent from the Pur- 



7. Dariuinula leguminella (Porbes). j beck beds. 



Upper-Pijrbeck Species (6 species, all of which recur from the 

 Middle Purbeck ; 4 go on to the Wealden). 



12. Cypridea punctata (Porbes). Very abundant. 

 12**. , var. gihbosa (Porbes). 



12*. , var. posticalis, nov. 



13. Dunkeri, nov. 



11. ventrosa, nov. 



10*. tubercidata (Sow.), var. adjuncta, nov. 



8. Cyprione Bristovii, nov. 



7. Darwimda leguminella (Porbes). 



Middle- Ptjrbece: Species (9 species, 2 of which are peculiar to this 

 Division; but 6 recur in the Upper Purbeck, and 5 in the 

 Wealden). 



14. Cypridea valdensis (Pitton). Yery rare in the Purbeck, but 



common in the Wealden beds. 

 13. Bunkeri, nov. 



-,o jj/T?-u\ f More abundant in the 



12. punctata (Forbes) | ^pp^^ p^^^^^^_ 



12*. , var. posticalis, nov. 



12**. , var. gihbosa (Porbes). 



11. ventrosa, nov. 



11* , var. globosa, nov. 



10. tuhercidata (Sow.). 



9. granulosa (Sow.), YSiT.fasciculata)YeTy abundant, and 



(Porbes). I peculiar to the Mid- 



9*. , var. paucigranulata, nov. J Purbeck. 



8. Cyprione Bristovii, nov. 



7. Darwinula leguminella (Porbes). 



