304 THE OXFORD OOLITE PERIOD. CHAP. 



Thracia depressa. Sow. O. C. 



Studeri. Ag. C.O. Bullingdon. 

 Trigonia clavellata. Sow. 0. C. St. Clement's. C. 0. Heddington. 



costata. Park. O. C. St. Clement's. C. 0. Heddington. 



triquetra. Lye. C. 0. Heddington. 



The whole list of dimyarian mollusks is of the ordinary character 

 of the Bath oolites a return one might think of the descendants 

 of the old sea denizens to the home of their sires. Nor are the 

 children much altered in form through the lapse of time and 

 change of circumstances. 



GASTEROPODA. 



Actseon retusus. Phil. C. O. 



Actaeonina polygyra. n. s. Phil. C. 0. Cumnor. 



Alaria bispinosa. Sow. O. C. St. Clement's. 



seminuda. Heb. and Desb. C. 0. Bullingdon. 

 Bulla elongata. Phil. C.O. 

 Ceritella costata. Whit. C.O. . 



Cerithium muricatum. Sow. C. 0. Bullingdon, Cumnor. 

 Chemnitzia Heddingtonensis. Sow. C. 0. Heddington. 



melanioides. Phil. C.O. 

 Cylindrites Luidii. Whit. C. 0. 

 Littorina laevissima. Whit. C.O. 



muricata. Sow. C.O. Heddington, Cumnor. 

 Murex Haccanensis. Phil. C. 0. Bullingdon. 

 Natica arguta. Phil. C. 0. Heddington, Cumnor. 



clio. D'Orb. C. 0. 

 Nejinaea Goodhallii. Sow. C.O. 

 Nerita brevispiralis. n. s. C. 0. Heddington. 



minuta. Sow. C. O. 

 Phasianella striata. Sow. C. O. Heddington. 

 Pleurotomaria bicarinata. Sow. C. 0. Cumnor. 

 depressa. Phil. O.C. Bullingdon. 

 reticulata. Sow. C.O. 



The resemblance of this list to the larger and richer catalogue 

 of the Great and Inferior oolite is very great. It is perhaps safe 

 to view it as a ' pauperized ' fauna, indicating the approaching 

 extinction of physical conditions which marked the oolitic ages 

 and influenced the life of the period. 



CEPHALOPODA. 



Ammonites athleta. Phil. O. C. Summertown. 



biplex. Sow. var. 0. C. Wolvercot, Summertown. 

 canaliculatus. Munst. O.C. Summertown. 

 catena. Sow. C. G. Marcham. 



cordatus. Sow. 0. C. St. Clement's. C. G. Studley. C. 0. Hed- 

 dington. 



