318 PEOF. T. E. JONES ON TKE OSTEACODA 



Dr. G. A. Mantell separated, as " CyjpAs Fittoni,'' a characteristic 

 Wealden species, some of the figures of " 0. tuhermlata" in Fitton's 

 memoir (1836). 



Homer and Bunker. — The so-caUed " Wealden " beds of jS'orth 

 Germany }ield several interesting species, some of which are found 

 in England also. 



In 1839 Fr. A. Eomer (' Yerstein. norddeufcsch. Oolithengebirges ') 

 figured and described (p. 52) from the " Wealden " beds of North 

 Germany — 



1. Cypris valdensis, Fitton, pi. 20. fig. 20, a, 6. Badly drawn, 



and with strong beak, although the reference is made to 

 fig. 1, pi. 21, Trans. Geol. Soc. ser. 2, vol. iv. 



2. oblonga, Eomer, fig. 21. Figured differently by Dunker 



afterwards. 



3. stnatojpunctata, Eomer, fig. 22, a, h. Figured by 



Dunker more distinctly afterwards. 



4. tubercidata, Fitton, fig. 23. Differing, however, some- 

 what in shape. 



5. granulosa, Fitton, fig. 24. Figured differently by Dunker 



subsequently. 



The figures are poor, and the descriptions scantj^ ; but the forms 

 cau mostly be recognized with the help of Dr. "W. Dunker's ' Mono- 

 graphic nordd. "Wealdenbildung,' 1846. Herein he gives — 



1. Oypris valdensis, Sow., p. 59, pi. 13. fig. 29, a, h. Copied 



apparently from Sowerby's original figure. 



2. Icevigata, Dunker, p. 59, pi. 13. fig. 25. 



3. ohlonga, Eomer, p. 60, pi. 13. figs. 24 & 26, a, 6. Figured 



here with a heaJc. 



4. stnatoj)unctata, Eomer, p. 60, pi. 13. fig. 32. 



5. granulosa, Sow., p. 60, pi. 13. fig. 31. Differing from 



C. gramdosa, Sow., in Fitton's memoir, pi. 21. fig. 4. 



6. tuhercidata (?), Sow., p. 60, pi. 13. fig. 30, a, b. Differing 



from C. tuhercidata. Sow., Fitton's memoir, pi. 21. fig. 2. 



7. rostrata, Dunker, p. 61, pi. 13. fig. 27. 



8. pinnceformis, Dunker, p. 61, fig. 13. fig. 28. 



These are all figured as belonging to the genus Cypndea, having 

 the antero-ventral notch and beak. 



Of the several Ostracoda described by F. A. Eomer (1839) and 

 "W. Dunker (1846), from the Purbeck-Wealden formation of North 

 Germany (see above, and Geol. Mag, dec. 2, vol. v. 1878, pp. 104- 

 106), Dr. C. Struckmann* refers C. valdensis, G. ohlonga, and O. 

 gramdosa to the Purbeck division. These determinations, however, 

 are probably open to revision. 



The late Dr. Dunker regarded the Wealden of Hanover, and that 

 of North Germany in general, as the equivalent of the English 

 Purbeck. (In letterf.) 



* ' Die Wealden-Bildungen der Umgegend von Hannover,' 1880, p. 56. 



t My old friend, the late Dr. W. Dunker, of Marburg, wrote the following 



