Trof. T. Rupert Jones — Wealden Entomostraca. 277 



line, a calcareous Wenlock-Niagara Series, is clear. A second 

 level, a calcareous Hamilton-Devonian, is also reasonably distinct. 

 The intermediate zone, the palaeontological evidence of which is 

 confused by differences of physical conditions, may fairly be inferred 

 to hold a middle place between Wenlock and Devonian. If, indeed, 

 there is no Devonian, as some have suggested, my argument will 

 require to be remodelled ; but it is difficult to study the magnificent 

 series which intervenes between true Silurian and true Carboniferous 

 in New York and Pennsylvania, and to come away with the con- 

 clusion that it is a mere base to the Carboniferous. 



VII. — On the Wealden Entomostraca. 

 By Prof. T. Eupert Jones, F.E.S., F.G.S. 



I SEND as a Supplement to my last communication the subjoined 

 Synoptical view of the species of Wealden Entomostraca, 

 treated of in the March Number of the Geol. Mag., trusting it 

 may prove acceptable to both collectors and systematists. 



Tabulated View of the Purbeck-Wealden Entomostraca of England, as 

 at present known. 



I. — From the Wealden Beds of the Southern Counties. 



1. Cypridea Valdensis (Sow. and Fittoii).^ Sowerby's " Min. Conch.," pi. 485, 



{Cypris faba). 



2. ' Austeni, Jones. In Fitton's plate ; " Trans. Geol. Soc," ser. 2, 



Tol. iv. pi. 21, fig. 1 ; Geol. Mag. Dec. II. Vol. V. p. 109, 110, PL III. Fig. 8. 



3. ? tuberculata (Sow.). Ibid. p. 104, 105, PI. III. Figs. 25, c. 



4. ? Fittoni (Mantell). Ibid. p. 104, PI. III. Fig. 2a. 



5. ? gramdosa (Sow.). Ibid. p. 104, 105, PL III. Fig. 4. 



6. spinigera (Sow.). Ibid. Fig. 3. 



II. — From the Neocomian Freshwater Sands of Shotov.er, near 

 Oxford. 



7. Candona Phillipsiana, Jones. Geol. Mag. Dec. II. Vol. V. p. 108, PI. III. 



Fig. 3. 



8. Cypridea verrucosa, Jones. Ibid. Fig. 5-7. 

 9. , var. crassa, Ibid. Fig. 4. 



10. bispinosa, Jones. Ibid. p. 109, PL III. Fig. 9-10. 



11. • Valdensis (Sow. and Fitton). Ibid. Fig. 11. 



12. Austeni, Jones. Ibid. p. 109, 110, PL III. Fig. 8. 



III. — From the Purbeck Beds of the Sub wealden Boring in Sussex. 



13. Cypridea Valdensis (Sow. and Fitton). Geol. Mag. Dec. II. Vol. V. p. 110, 



PL III. Fig. 13-15. 



14. granulosa (Dunker). Ibid. Fig. 16. 



Besides some undetermined specimens. Ibid. p. 110. 



IV. — From the Purbeck Beds of Dorsetshire. 



a. — Upper Purbeck. 



15. Cypris ? gibbosa, E. Forbes (near C. spinigera, Sow.) 



16. ? tuberculata, E. F. (near C. tuberculata, Sow.) 



17. ? leguminella, E. F. 



b. — Middle Purbeck. 



18. Cypris P striatopunctata, E. F. (? Fr. A. Eomer.) 



1 This is the species generally referred to by Dr. Fitton in his Memoir, but not 

 the form figured by him in his plate. 



