372 Eeport of the State Geologist. 



Beecheria Davidsoni. 



Plate 14, figs. 7-11. 

 Terehratiila sacculus (Martin), Davidson. Quart. Jour. Geol. Soc, London, vol. 



XIX, p. 169, pi. ix, figs. 1-3. 1863. 

 Beecheria Davidsoni^ Hall. Palaeontology of N. Y., vol. VIII, pt. 2, p. 800, pi. 



Ixxxix, figs. 38-36. 1894. . 



Shells small, terebratuliform, oval, broadest medially, attenu- 

 ate at the beak. Valves biconvex, surface smooth. On the 

 interior the pedicle valve is without dental plates, and the loop, 

 which is short, is supported by a divided hinge-plate. 



Carboniferous limestone. Windsor, Nova Scotia. • 



Dielasma obovatum. 



Plate 14, figs. 12-14. 

 Dielasma obovatum, Hall, Palaeontology of N. Y., vol. VIII, pt. 2, expl. pi. 

 Ixxxi, figs. 38-40. 1894. 



Shell elongate-ovoid, attenuate in the umbonal region. Sur- 

 face biconvex, smooth, sloping subequally from the median por- 

 tion of the beaks. Beak of the pedicle- valve broadly and some- 

 what obliquely truncated. 



Coal Measures. Kentucky, 



Cyrtina neogenes. 



Plate 8, figs. 4-8. 



Cyrtina neogenes, Hall. Palaeontology of N. Y., vol. VIII, pt. 2, expl. pi. 

 Ixxxiv, fig. 41. 



Shells having the form of Spiriferina, extended on the hinge, 

 with 5-7 plications on the lateral slopes. Internally with the 

 structure of Cyrtina. 



Chart of the Burlington limestone. Burlington, Iowa. 



