authors interpret these bodies as the remains of gelatinous algoe, 

 and distinguish them under the name of Reinschia, a genus which 

 they regard as nearly allied to the Ifydrodictyacece or Volvocinece. 

 Mr. Seward ' has recently discussed the question of the attribution 

 of these fossils. 



Not represented in the British Museum collection. 



Genus PILA, Bertram! & Benault, 1892. 

 [Bull. Soc. Hist. nat. d'Autun, vol. v, p. 189.] 



Thallus microscopic, irregularly spherical or ollipsoidal. Cells 

 varying from 6 to 700, radially disposed in the outer portion of 

 the thallus and pyramidal in shape. The more internal cells are 

 less regularly arranged and polyhedral in form. The size of the 

 thallus varies from -189 to ■225 mm. in length, and -136 to 

 • 1 6 mm. broad. 



Several species of Pila have been described by MM. Bertrand & 

 Benault from the Bogheads of Scotland and from Autun in France. 

 These coals have proved to consist largely of minute yellow bodies, 

 which these authors regard as the thalli of gelatinous algse, and 

 which they have referred to this genus. A further species has 

 also been described by M. Bertrand from the kerosene shales of 

 New South Wales. 



Pila australis, Bertrand. 

 1896. Pila australis, Bertrand, Bull. Soc. Hist. uat. d'Autun, vol. ix, p. 287. 



Thallus regular, ellipsoidal, not lobed, and without invaginations. 

 The surface consists of a regular cellular network with hexagonal 

 meshes. The thalli are hollow. The number of cells varies from 

 18 to 30, and the cells are disposed in a single row. The size of 

 the thallus is 100/t along the greater, and 65^ along the lesser 

 diameter. 



Pila australis has been found only in the kerosene shale of 

 Doughboy Hollow, New South Wales. 



Not represented in the British Museum collection. 



1 Seward (98'), p. 182. 



