416 



Prof. T. R. Jones and Dr. H. B. IToll on 



Tabic of the Distribution of Primitia. 



1. Primitia strangulata, Salter, sp. 



Beyrichia strangulata, Ann. Nat. Hist. ser. 2. vol. xvi. p. 171 , pi. 6. fig. 18. 



This is one of the largest forms belonging to Primitia, and it 

 has a larger marginal rim than any other. Found in calcareous 

 schists (Lower Silurian) at Coniston Waterhead, Lancashire. 



This species was mentioned, under the provisional name of 

 " Cytherina laevigata/'' by Mr. Salter in 18 15 (Quart. Journ. 

 Geol. Soc. vol. i. p. 145), as occurring abundantly in the Conis- 



