I X VERTEBRATE PALJEONTOLOG V. 347 



1 know of no described species from other regions nearly enough related 

 to this to render a critical comparison necessary. Mr. Gabb has figured, on 

 pi. 18, tig. 4. r ), vol. I, of the California Palaeontology (apparently without any 

 reference to it in the text), a somewhat similar form, belonging, I should 

 think, to the same group, but presenting very obvious specific differences. 



Locality and position. — Fox Hills, Moreau Trading Post, and Long 

 Lake, Dakota, in the Fox Hills group; also, on the Yellowstone River, 150 

 miles above its mouth, in a bed containing a mingling of the fossils usually 

 found in the Fox Hills group with those of the upper part of the Fort 

 Pierre group. 



Pyrifusns (Mepluiiella) subturrttus, M. & H. (sp.). 



Plate 32, figs. 3, a, b. 



Funis subturrittts, .Meek and Harden (1857), Proceed. Acad. Nat. Sci. Philad., IX, 139. 

 Pyrifusns subtun-itus, Meek (1864), Smithsonian Cheek-List N. Am. Cret. Fossils, 22. 



Fig. 40. Shell fusiform, rather thin; spire conical, turreted, 



# apparently two-thirds as long as the aperture and canal, 

 acute at the apex; volutions about seven and a half, 

 obliquely flattened or a little concave above, and convex 

 and subangular around the middle, where they are each 

 ornamented by about twelve very regular, distinct, vertically- 

 elongated nodes or folds, separated by spaces equaling their 

 own breadth ; surface marked by fine lines of growth, 

 crossed by distinct, elevated, thread-like, revolving lines, 



ryiifusus (Neptunella) about as wide as the intervening depressions ; suture mod- 

 8ubturritu8. 



erately distinct, and, when viewed from above, seen to 



A dorsal view, to » 



show the curves of deviate from a regular curve in following the ilexuous 



the lines of growth. ." . 



indicating a broad outline ot the vertical tolds ; aperture rhombic-obovate, 

 sinuosity of the lip obtusely angular above, most convex on the outside, and 



above the middle, riot J ° 



well represented in tapering into the straight canal below; inner lip not very 



the figures on the ... „ -,. , . , , ,, 



pi at6 _ distinct from the solid, straight columella. 



Length, 1.73 inches ; breadth, 0.90 inch. Apical angle nearly regular, 

 sometimes a little concave above, and convex below; divergence, 55°. 



This shell is related to the last, but differs in having a more elevated 

 spire, which is more acute and attenuate at the summit, while the body- 

 volution is proportionally less expanded in the middle. It. likewise 

 differs from that species in having from two to two and a half volutions more, 



