17G SYSTEMATIC PALEONTOLOGY 



Volitta obtiisa Meek, 1804, Miocene Check List, Sniitli. Misc. Coll. (3 83^ p. 19. 

 Scaphella [Aurinia) obtiisa Dall, 1S90, Trans. Waguer Free Inst. Sci., vol. iii, pt. i, 



p. 80, pi. vii, fig. 7. 

 Scapliella (Aurinia) obtiisa Dall, 1892, Trans. Waarner Free Inst. Sci., voL iii, pt. ii, 



p. 327. 

 Scaphella (Aurinia) obtnsa Cossmann, 1899, Essais de Paleoconch. Comp., vol. iii, 



p. 129. 



Description. — " Shell fusiform, contracted above the body-whirl, and 

 forming thereby a sub-cylindrical spire ; spire obtuse apex papillated 

 and hooked; body-whirl plaited longitudinally at its top; columellar lip 

 furnished with only two plaits.'" Emmons, 1858. 



The body whorl is covered with fine, closely-set, revolving striae, and 

 the shoulder is tuberculate. Aside from the size of the nucleus there is 

 no great difference between our Maryland specimens and the young of 

 S. typus. 



Occurrence. — St. Maby's Formatiox. St. Mary's Kiver. Calvert 

 Formation'. Plum Point. 



Collections. — Philadelphia Academy of Natural Sciences, U. S. 

 National Museum. 



TuRBiXELLA (?) DEMissA Conrad. 



TurbineUa demissa Conrad, 1834, Jour. Acad. Nat. Sci. Phila., vol. vii, 1st ser., 



p. 136. 

 Not CariceUa demissa Conrad. 



Description. — "Shell fusiform, with very obscure spiral stria?; whorls 

 slightly contracted above, the convex part having obscure longitudinal 

 undulations; suture impressed; spire elevated; columella with three 

 profound thickened plaits; the superior one shortest and most thick- 

 ened; beak produced, recurved. Length, two and a half inches. 



'' Locality, Choptank river, Md." Conrad, 1831. 



This species has never since been found, nor referred to in the liter- 

 ature, nor has any gastropod of this size or at all of this general de- 

 scription been found on the Choptank. But this same bed contains at 

 Jones Wharf and Governor Run Scapliella typus which answers exactly 

 to the above description except that it has two folds on the columella 

 instead of three. 



In the collections of the Philadelphia Academy of Natural Sciences is 

 a specimen labelled ''' Vohdn sinvosa miocene/' which may be the tyjDO 

 of this lost species. Only part of the body whorl is present and the 



