MAROELLUS LIMESTONES OF LANCASTER 169 



GASTROPODA 



PLEUROTOMARiA De Fraiice 

 Pleurotomaria lucina Hall 



Pal. N. Y. vol. 5, pt 2, p. 67, pi. 18 



Large and well preserved, but somewliat compressed repre- 

 sentatives of this species were found in bed VII. The shell is 

 not retained, but the spiral and transverse striae are distinctly 

 shown on the surface of the cast. 



Pleurotomaria itys Hall 



Pal. N. Y. vol. 5, pt 2, p. 76, pi. 20 



The specimens of this species are rather poorly preserved casts 

 retaining three whorls of the spire, but the form and surface 

 markings are sufficiently distinct for identification. 



Pleurotomaria capillaria var. rustica (Conrad) 



Pal. N. Y. vol. 5, pt 2, p. 77 



All the representatives of the species^ at this locality a^re small. 



A very perfect cast was found in bed II, having the dimensions : 



hight 5.5 mm, greatest width 6.5 mm. Three whorls are retained, 



all of which show the finer surface ornamentation and the spiral 



band. 



Pleurotomaria ella Hall 



Pal. N. Y. vol. 5, pt 2, p. 72 



Fairly perfect molds of this shell have been found in fragments 



of the Stafford limestone thrown out in digging the sewer 



trenches on Buffum street, but the bed from which they came is 



not known. 



Pleurotomaria sp. 



In bed IV is a small species having the general shape and 

 spiral band characteristic of the genus. The surface markings 

 being obliterated, no specific determination could be made. 



