174 SYSTEMATIC PALEONTOLOGY 



Subgenus AURINIA Adams. 



ScAPHELLA (Aurinia) mutabilis (Conrad). 

 Plate XLIV, Figs. 8, 9. 



Voluta Lamherti Morton, 1830, Jour. Acad. Nat. Sci. Pbila., vol. vi, 1st ser., p. 119. 

 Fasciolaria Lamherti Conrad, 1830, Jour. Acad. Nat. Sci. Phila., voL vi, 1st ser., 



p. 210. 

 (Not Foluta lamherti Sowerby.) 

 Fasciolaria mutabilis Conrad, 1834, Jour. Acad. Nat. Sci. Phila., vol. vii, 1st ser., 



p. 135. 

 Fasciolaria mutabilis Conrad, 1841, Amer. Jour. Sci., vol. xli, pp. 343, 346, pi. ii, 



fig. 7. 

 Fasciolaria mutabilis Conrad, 1843, Trans. Amer. Assoc. Geol. and Nat., p. 109, 



pi. V, fig. T. 

 Voluta mutabilis Lyell, 1845, Quart. Jour. Geol. Soc. London, vol. i, p. 421. 

 Voluta mutabilis Lyell, 1846, Pioc. Geol. Soc. London, vol. iv, p. 555. 

 Voluta mutabilis Tuomey and Holmes, 1856, Pleiocene Fossils of South Carolina, 



p. 128, pi. xxvii, figs. 5, 6. 

 Voluta mutabilis Emmons, 1858, Rept. N. Car. Geol. Survey, p. 262. 

 Voluta [Volutifusus) mutabilis Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 563. 

 Voluta ( Volutifusus) mutabilis Meek, 1864, Miocene Check List, Smith. Misc. Coll. 



(183), p. 19. 

 Scaphella (Aurinia) mutabilis Dall, 1890, Trans. Wagner Free [nst. Sci., vol. iii, 



pt. i, p. 80. 

 Scaphella (Aurinia) mutabilis Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, 



pt. ii, p. 227. 

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



iii, p. 129. 



Description. — " Shell fusiform; spire conical with the whorls slightly 

 contracted above, and the convex portion with longitudinal undulations, 

 becoming obsolete in old shells; apex somewhat papillated; labrum 

 arcuated ; columella with two very oblique not much elevated folds, some- 

 times obsolete; beak slightly recurved; aperture more than two thirds 

 the length of the shell. Length about four inches." Conrad, 1834. 



Surface marked by very faint, wavy, revolving striae; beak usually 

 straight with the plaits almost or quite invisible at the mouth but 

 rapidly becoming stronger within; but the beak is sometimes much bent 

 and then the plaits show strongly at the mouth. 



Length (restored), 180 mm.; diameter, 60 mm. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver, Cove Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum, Philadelphia Academy of Natural Sciences. 



