PLEISTOCENE FORMATIONS OF SANKATY HEAD 725 

 In the table: x = occurs, a = abundant, c = common, r = rare. 



Number of Bed 



P or if era. 



Cliona sulphnrea Desor 



Echinodermata. 



Strongylocentrotus drobachiensis Mull 

 Annelida. 



Serpula dianthus Verrill 



Bryozoa. 



Hippothoa variabilis Leidy 



Pelecypoda. 



Area ponderosa Say 



A. transversa Say 



Venus mercenaria Linn 



V. mercenaria var. antiqua Verrill.. . . 



Ostrea virginiana Lister 



Anomia aculeata Gmelin 



A. simplex D'Orb 



Mya arenaria Linn 



M. truncata Linn 



Mactra solidissima Chemn 



*Serripes laperousii Deshayes 



*Pecten magellanicus Conrad 



Ensis directus Conrad 



Corbula contracta Say 



Mytilus edulus Linn 



*M. exustus Linn 



*Modiola plicatula Lamk 



M . modiolus Linn 



M. hamatus Verrill 



Crenella glandula Totten 



Macoma fusca Say 



*M. fusca var. fragilis Say 



*M . incongrua von Martens 



Cummingia tellinoides Conrad 



Petricola pholadiformis Linn 



*Pholas truncata Say 



*Zirfaea crispata Linn 



Panopea arctica (Lamk.) Gould 



(=Saxicava norvegica Linn.) 



Saxicava arctica Linn 



Pandora gouldiana Dall 



*P. crassidens Conrad 



Astarte quadrans Gould 



Astarte undata Gould 



A. castanea Say 



*A . crebricostata Forbes 



Ceronia deaurata Turton 



(=Mesodesma) 



C. arctata Adams 



few 



? 



spines 



x 

 few 

 few 

 one 

 one 



few 



one 



? 



one 



one 



frag. 



two 

 valves 



few 



