Fossil Cypridinidte and some Allied Ostracoda. 341 



9. From the extensive calcareous formation known as the 

 ^Mountain-limestone, including the Lower Carboniferous series 

 in Scotland, numerous genera and species allied to Cypridina 

 were described and illustrated in 1874 and 1884 in the 

 Palffiontographical Society's Monographs, by T. E-upert 

 Jones, J. W. Kirkby, and G. S. Brady. Thus : — 



Number of 

 Genera. Species. 



Cypridina 13 



Bradycinetus .... 1 



Philomedes (?).... 1 



Cypridinella 7 



Cypriddlina 8 



Cypi-idella 6 



Cyprella 2 



Sulcuna 2 



Rhombina 2 



Polycope 3 



02f« 1 



£ntomoconchu8 . ... S 



Leadiug Characteristics in the 

 Fossil Forms. 



Notch and beak, slight in some, more pro- 

 nounced in others. 



Beak produced and truncate. 



Notch deep and broad. 



Ovate, produced at each end : more or 

 less apiculate behind ; antero-ventral 

 region projecting and prow-like. 



Like Cypridinella, but bearing a tubercle or 

 hump above the median line. 



Like Cypridellina, but having a dorsal 

 sulcus behind the tubercle. 



Nearly like Cypridella, but annulate. 



Subovate, with a deep and oblique sulcus 

 modifying the dorsal region ; front 

 truncate ; notch obsolete. 



Oblique-oblong; notch obsolete on the 

 front slope. 



Round or oval, Avith faint indication of 

 the notch. 



Subglobose; front edge truncate and im- 

 pressed by a nearly central slight in- 

 turning of the margins of the valves. 

 Subglobose ; front edge truncate and modi- 

 tied by the margins being pressed in- 

 wards, and each forming a sinuous 

 curve, which leaves a long-oval opening 

 below a short beak, and a narrower and 

 shorter slit in the ventral reoion. 



10. From the Coal-measures only a few ('ypridinids have 

 been obtained. Cypridina radiata, Monogr. Carb. Entom., 

 Pal. Soc. 1874, p. 14, pi. v. figs. 6a-6_/; and Philomedes 

 elongata, Monogr. Carb. Entom. 1884, p. 81, pi. vi. tigs. 1 a- 

 1 c. The former from Scotland, and the latter from England, 

 have both a peculiar radiate structure of the test. 



11. In a memoir by Professor G. G. Gemmellaro, "On 

 the Crustacea of the Fusulina-lime&tonQ of the Valley of the 

 Sosio River, in the Province of Palermo, Sicily," Mem. Soc. 

 Italiana delle Scienze fiss. e nat. vol. viii. ser. 3, no. 1, 

 40 pages, with 5 pUites (4to, Kaples, 1890), he refers to this 

 limestone as being a " Permo-Carboniferous " formation j 



