330 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 27, 



Cereojpora-. Pl. XXVIII. figs. 9-il. This species is nearly allied 



to C. diadema of Goldfuss. 

 Manon: Pl. XXVIII. figs. 12-14. A small claviform species. 



FoRAMiNiPERA. — With the exception of spicula of ^^cyor.^« or Gor- 

 gonice, all the microscopic organisms belong to a few genera of Fora- 

 minifera. These have been carefully examined and compared by 

 Mr. Rupert Jones. 



Rosalina IcBvigata, Ehrenberg. Found in the chalk of Sicily. 



Beccarii, Linn. sp. A common recent form. 



. Somewhat resembling Cristellaria propinqua, Reuss^ from 



the tertiary formations. 



Textularia : Pl. XXIX. fig. 1. "Nearly related to an undescribed 

 gault species, and to a species from the magnesian limestone, T. cu- 

 neiformis, Jones." — Mr. R. Jones. 



Textularia eloyigata^ nov. spec. : Pl. XXIX. fig. 2. This is a re- 

 markable species, and is so like a common but undescribed form 

 in the Charing chalk-detritus, first discovered by Mr. Harris, that 

 Mr. R. Jones thinks it is identical *. 



glohosa^ Ehrenb. Common in the chalk. 



aciculata, Ehrenb.: Pl. XXIX. fig. 3. Common in the chalk. 



In addition to the above, Mr. R. Jones has detected the following : 



Globigerina. 



Nodosaria limhata^ D'Orbigny. Cretaceous. 



Cristellaria rotulata, Lamarck, sp. Cretaceous. 



Dentalina, 



Polymorphina. 



Bulimina. Two or three species. 



Rosalina Lorneiana, D'Orbigny. Cretaceous. 



Entomostraca. — Bairdia subdeltoidea, Miinster, sp. Recent, ter- 

 tiary, and cretaceous. 

 Cythereis interrupta, Bosquet, sp. Cretaceous. 

 gibba, Roemer, sp. Tertiary. 



— galtina, Jones. Cretaceous. 



Pleistocene or newer Tertiary Blue Clay of Onehakara. 



The argillaceous strata extending from near Kakaunui to Matakaea, 

 abound in shells of species that still inhabit the neighbouring sea, 

 and must therefore be considered as a comparatively modern tertiary 

 or pleistocene formation. 



The microscopic organisms are but few ; they consist of circular 

 discs with regularly perforated hexagonal apertures {Coscinodiscus) , 

 resembling a form common in the slate of Jutland ; and others with 

 a hyaline centre surrounded by a richly sculptured margin {Actino- 



* I am doubtful whether this fossil does not terminate apically in a discoidal 

 involution ; thus resembling, in external form, the Spirolinites and Lituolites, but 

 differing from the latter in the alternate arrangement of the cells. Specimens in 

 flint, having this form and structure, have been transmitted to me by Mr. Samuel 

 Smith, of Wisbeach. 



