Pleu. 



714 



sures above their habitat. Closely related to F, lahrosa, Hall, 

 of N. Y. Low. Helderberg.— Yellow Spring, O.—Mayara lime- 

 stone, Vb, 



Fleurotomaria pauper. See Troehonema pauper. Vb.' 



Pleurotomaria piasensis. (Hall, Tranp. Alb. Inst. Vol. 

 ^^;^ 4, 1856, Whitfield, Bull. 3, Am. Mus. 

 /$|^P^ Nat. Hist. N. Y., 1882, plate 9, figs. 6, 7) 

 J^QH^^: Collett's Indiana Rt., 1882, page 354, 



Kict'^^-^IV^t^p/ V^' ^^^^^ ^^' ^^^' ^' "^^ rnagnined three times, 



'^' ' side and top view of specimen with sharp 

 edge all round. Differs slightly from P. humilis, —Fmssi 

 Creek above Alto a. 111. Subcarboniferous. XL 



Pleurotomaria progne, Billings, Geology of Canada, 1863, 

 ^'^^ ££oL Can page 181, fig. 176. Trenton limestone 



formation, II c. 



Pleurotomaria ramsayi, Billings, Geology of Canada, 



f Ml ^^ j^^^^^ 1863, page 117, fig. 26 ^, 



^^ " b. Found in the Calcif- 



erous formation, II a. 



Pleurotomaria regulata, Hall, 14th Annual Keport, 1861, 

 Y///^ ^ ^ page 108, 15th An. Rt., 1862, plate 



5, figs. 4, 5. Hamilton formation, 



VIII G^ 



Pleurotomaria rotalia, Hall, 15th An. Rt. N. Y., 1862, 

 J, page 46, plate 5, fig. 11. Has nearly the form 

 of P, sulcomarginata, but no keel, and no sharp 

 raised striae. Largest specimens ^ inch in dia- 

 meter, and I high. Found at Piatt's Rock, N. 

 5 Y., in Hamilton calc. shale. VIII c. 



