47 



were mixed with those from the Fuller's Earth, being nearly 

 the same colour. It will be observed that the species peculiar 

 to the Oolitic Marl of Cheltenham district, as Rhyn. Lycetti, 

 Dav., Rhyn. subobsoleta, Dav., Waldheimia Leckeribyi, Walker, 

 Terebratula fimlria, Sow., Terebratula submaxillata, Dav., etc., are 

 wanting both in the Dorset district and in France ; and that 

 several species, as En. ringem. Herault, Eh. parvula, E. Desl., 

 Rh. plicatella, Sow., Rh. senticosa, v. Buch., Waldhemia subbuccu- 

 lenta, Chap, et Dew, W. Waltoni, Dav., W. emarginata, Sow., 

 Terelratula decipiem, E. Desl., T. Ferryi, E. Desl., T. Morierei, 

 Desl. and Dav., T. Stephani, Dav., T. sphceroidalis, Sow., occur in 

 France and Dorset and Somerset, and not at Cheltenham. Prob- 

 ably some Palaeozoic barrier separated these two areas during 

 the deposits of these zones, and the exact equivalents may not 

 be able to be found on comparing the different horizons of the 

 Inferior Oolite of these districts. The Oolite marl being absent 

 in France and Dorset ; the bed containing Rh. ringem has not 

 been found at Cheltenham. It is also worthy of remark that 

 the Brachiopoda of the other Oolitic strata, and the Lias of 

 Somerset and Dorset contain several species which do not occur 

 in other parts of England, but are common in France. 



