Maryland Geological Survey 423 



Rostellites nasutus Gabb, 1S76, Proc. Acad. Nat. Sci., Phila., p. 294. 

 Rostellites nasutus Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 



86, pi. xi, figs. 1, 2. 

 Rostellites nasutus Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 25. 

 Rostellites nasutus Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 786, pi. xcvii, figs. 1, 2. 



Description. — " Shell elongated, narrow ; whorls about four ; spire very 

 elevated; mouth about two-thirds the length of the shell; three folds on 

 the columella ; surface markings unknown. From traces on the cast, 

 apparently marked by crossed revolving striae." — Gabb, 1860. 



Type Locality. — Monmouth County, New Jersey. 



" Shell of moderately large size, sometimes attaining a length of nearly 

 or quite five inches. Form slender, with proportionally short, turreted 

 spire, varying from two-thirds the length of the body volution in the casts 

 to not more than one-third in the shell itself ; number of volutions uncer- 

 tain, the type specimen having had about four ; body volution slender, most 

 ventricose near the upper part, marked by numerous spiral ridges with 

 broader interspaces which have possibly been marked by smaller ridges 

 between the large ones ; the upper lines nearly parallel to the suture, but 

 below they become more and more oblique, so that the lower ones become 

 nearly parallel with the columella; aperture comparatively broad and 

 the lip thin ; columella marked by three or four very oblique folds, situated 

 near the middle of its length ; the upper three at equal distances from each 

 other and the lower one a little more distant from the next above.'' — Whit- 

 field, 1892. 



The evidence of the former presence of the species in Maryland and 

 Delaware is fragmentary, but it is so well differentiated from the other 

 volutes by the very slender outline, numerous columellar plications, and 

 the cone-in-cone aspect of the cast of the spire, that determinations may 

 be made with assurance even from fragments. 



Occurrence. — Monmouth Formation. Two miles north of Delaware 

 City, on John Higgins farm, Delaware. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences. 



Outside Distribution. — Matawan Formation. Merchantville clay marl, 

 New Jersey. Monmouth Formation. Navesink marl, New Jersey. 



