291 



Occurrence. BEEKMANTOWN LIMESTONE (Turritoma zone). Stouf- 

 ferstown, Pennsylvania, and east of Huyett, Maryland. 

 Collection. TJ. S. National Museum. 



PLEUROTOMARIA ? FLORIDENSIS Cleland 

 Plate XXXI, Fig. 6 



Pleurotomaria floridensis Cleland, 1900, Bull. Amer. Pal., vol. iii, p. 125 

 (253), pi. xv, fig. 12. 



Description. Shell quite small, 3 mm. wide at the base and 4 mm. 

 high, consisting of five slightly rounded volutions, conical, with an apical 

 angle of 44 and a minute umbilicus. 



Imperfect casts and cross-sections in the rock of a small conical shell 

 found occasionally in the Stonehenge limestone of Maryland seem to be 

 representatives of this interesting species which hitherto has been noted 

 only in the corresponding horizon in New York. The reference of this 

 species to Pleurotomaria is known to be incorrect, but in the present state 

 of our knowledge of Canadian gastropods it is useless to attempt more 

 accurate generic determination. The specimens found in Maryland are 

 not well enough preserved for a critical study of their generic characters. 



Occurrence. BEEKMANTOWN LIMESTONE (Sttoehenge member). 

 Vicinity of Hagerstown, Maryland. Tribes Hill limestone of New York. 



Collection. U. S. National Museum. 



Genus HORMOTOMA Salter 

 HORMOTOMA ARTEMESIA (Billings) 



Plate XXXVI, Figs. 8, 9 



Murchisonia artemesia Billings, 1865, Pal. Fossils, vol. i, Geol. Surv. 

 Canada, p. 345, fig. 332. 



Description. Shell elongate, varying from 50 to 75 mm. in length, 

 slender, consisting of 10 to 12 depressed convex whorls with a strong, 

 rounded spiral band. In casts the whorls are depressed ventricose, 

 flattened in the middle and abruptly rounded in the deep suture. Casts 

 of the exterior show a strong, rounded band along the median line of the 



