THE B0RR0WDALE SERIES AND THE CONISTON FLAGS. 463 



Fossils of the Dufton Shales. 



Actinozoa. 



1. Petraia, sp. Swindale. 



2. Chcetctes, sp. An incrusting, subniassive species, commonly growing on 



Orthocerata. Thin sections show that the tubes are furnished with 

 a few remote tabulae. Surface characters unknown. Common at 

 Pusgill along with Discina corona, Salt., sp., Bellerophon bilobatus, 

 Sow., &c. 



Annelida. 



1. Conchicolites gregarius, Nich. This singular form is found abundantly 

 along with the incrusting species of Chcstetes just spoken of, attached 

 to the outer surface of Orthocerata, in the Discina-corona bed. 



Braciiiopoda. 



1. Lcptcena transversalis, Wahl. Smelt Mill, Hilton. 



2. Strophomena expansa, Sow. Harthwaite Gill, Dufton. 



3. Leptcena sericea, Sow. A small variety of this shell with fewer principal 



radii than the normal form, and of about half its size, occurs very 

 abundantly in Pusgill, and less commonly in all the other localities. 



4. Orthis testudinaria, Dalm. Swindale and Pusgill. 



5. Discina {Trematis) corona, Salt. This fine Brachiopod occurs abun- 



dantly, though in a more or less fragmentary condition, in a single 

 stratum in Pusgill, along with Orthocerata, Conchicolites gregarius, 

 Bellerophon bilobatus, &c. 



6. Lingula temdgranulata, M'Coy. Pusgill. 



7. ovata, M'Coy. Pusgill. Both these Lingula seem to be confined 



to the stratum with Discina corona. 



8. Orthis biforata, Schloth. Dufton-Town dykes. 



9. Strophomena rhomboiclalis, Wilckens. Pusgill. 

 10. Orthis vespertilio, Sow. Dufton-Town dykes. 



HETEROrODA. 



1. Bellerophon bilobatus, Sow. Pusgill. 



Cephalopoda. 



1. Orthoceras, sp. A smooth form resembling 0. baculifcrme, M'Coy. 



Common at Pusgill, in the Discina-corona stratum. 



2. Oncoceras, sp. Not uncommon at Pusgill, in the same bed as the 



preceding. 



Crustacea. 



1. Calymcne Blumenbachii, Brongn. Very abundant in Pusgill and Dufton- 



Town dykes, less so in Swindale. 



2. Trinucleus concentricus, Eaton. Very abundant in Pusgill and Dufton- 



Town dykes, less abundant in Swindale. 



3. Cybele verrucosa, Dalm. Dufton-Town dyke. 



4. Ampyx nudus, Murch. (?) Rare in Pusgill. 



5. Lichas laxatus, M'Coy. Pusgill. 



6. Illcenus Bowmanni, Salt. Swindale and Hilton. 



7. Encrinurus, sp. Pusgill. 



8. Beyrichia Wilckcnsiana, Jones. Abundant in Pusgill in the Discina- 



corona bed, and also in the ashy beds in Swindale. 



9. Primitia semicircularis, Jones & Holl. In ashy beds. Swindale. 



The predominance in the Dnfton Shales of such Brachiopods as 

 Strophomena expansa, Leptcena sericea, Orthis testudinaria, 0. vesper- 

 tilio, 0. biforata, and Lingula oralis, together with the abundance 

 of such trilobites as Calymene Blumenhachii, Trinucleus concentricus, 



