INVERTEBRATE PALEONTOLOGY. 363 



have a doubt thai it belongs tit the same group. Indeed, I have even some- 

 times supposed thai it mighl possibly be only a variety of the same; though 

 this seems scarcely possible, as may be seen by comparing figure 2, b, of the 

 type-specimen, with figure 1, d, of the last species. 

 Locality and position. — Same as last. 



Fasciolaria (Piestocliilus) c r e I a c c a . M. & H. 



Plate 31, figs. 11. a, b. 



Fasciolaria cretacea, Meek and Hayden (1856), Proceed. Acad. Nat. Soi. Pfailad., VIII, 66.— Meek (1864), 

 Smithsonian Check-List N. Am. Cretac is Fossils, 21. 



Shell small, elongate-fusiform ; spire produced-conical, or about equaling 

 the length of the aperture and canal ; volutions five or six, moderately convex, 

 last one not ventricose, rounding to Ihe suture above, and rather distinctly 

 narrowing below into the slender, somewhat flexuous, rather produced, and 

 twisted canal: suture distinct; aperture very narrow, angular above, and 

 tapering into the canal below ; columella somewhat twisted, and bearing four 

 or five small or linear, moderately oblique, plaits, nearly opposite the middle 

 of the aperture, that do not show externally in a direct view inlo the aperture 

 of unbroken specimens ;* surface polished, and marked by fine, obscure lines 

 of growth, crossed by slender, impressed, revolving lines, leaving wider, 

 slightly raised, little, revolving bands between. 



Length, 0.50 inch ; breadth, 0.16 inch ; angle of spire, with nearly straight 

 slopes, diverging at an angle of about .->2°. 



This is a delicate, slender, little shell, much resembling a Fu.s/ts in form 

 and general appearance, more particularly when the outer lip is so entire, or 

 the aperture so filled with foreign matter, as to prevent one from examining 

 the columella around within tin? aperture; the plaits of the latter not appear- 

 ing in a direct view into the aperture. At a first glance, it might be mistaken 

 lor a young <>f F Culbertsoni ; but, on closer examination, its columella will 

 be seen to be more tortuous, and the revolving surface-markings different; 

 that is,, instead of having the little revolving furrows nearly or quite as wide 

 as the raised lines between, it has these furrows merely like impressed hair- 

 lines, with flattened, little, band-like spaces between, of decidedly greater 

 breadth than the impressed lines themselves. On the upper part of the 



' lh. se plaits are nut represented oblique enough iu our figure 11, b. This specimen has the outer 

 lip broken away for marly one-half of the distance around the last turn, thus exposing the columella 

 farther around within the aperture than if entire. 



