S.lli.illH- p. UI. 



half, the ciilumella relatively narrow; aperture comparatively wi.l. , wnl.-i in th. mi. 1. 1,.-, (lie greatest 

 wi.lt h sightly exceeding a third of the I.-iu-th: outer Up (harp, nearly straight In the upper twit-thirds, 

 and strongly roundel, with also .1 :. rotral sweep, In the lower thlnl; outer surface of shell per- 



imooth In thf inat.-riii! at hand. On a fragment "f the body whorl, which seems to preserve only 

 .if tin- - itfht or too revolving brown hand* are shown. 



Tlii- tin-- -I--.-I.-- is readily d!t uik'ui-h--.! rr.nu most other species of the genus by Its regularly taper- 



iNk 1 -!;'. and fn tli.-r- l.y tin' unusually abrupt contraction of tin- lower half of the body whorl. In 



the last feature, as woll as In the resulting shape of the Inner wall of the aperture, the specie* resembles 

 /tuuptra, particularly such specie* of that genus as F. planitlata and F. nobtlit. 



and locality. Stone- KIV.T group, Cannon Falls. Minnesota: Murfreesboro, Tennossec; 

 an. I Iliirh Bridge. Kentucky. Also near Ottawa, Canada, where It Is said to occur In the Black River 

 lime-' 



K. O. Ulrlch 



SUBULITM, sp. undet. 



I'l. ATE l.\ \ \ I MiiS. a. 14. M and 17. 



Compare FtuupiniT ipieula SAKOBBON, 1892, Bull. Minn. A cad. Nat. Scl., vol. ill, p. 338, pi. vi, figs. 

 10 and 11. 



We have several specimens of a small StAttHltt agreeing with 8. rtyulari* In having a regularly taper- 

 Ing spire and rapidly contracting body whorl. The specimens consist of Interior casts and testlferous 

 fragments, and at flrst we thought they belonged to that widely distributed species. A careful compar- 

 ison, however, shows that the whorls are almost perfectly flat In the spire Instead of slightly convex, 

 while the shell has a band at the suture that Is not apparent In any example* of 8. rtgularis. This banded 

 stature allies the form with .S bfloittnxui and S. peryradU*, from which It Is distinguished by the shape of 

 Its body whorl. The specimens In question are peculiar In one feature when compared with all true species 

 of the genus, namely, the tilling of the apical whorls Is extremely limited, the casts of the Interior being 

 almost as acute at the apex as Is the shell Itself. 



Sardeson's Futitpira t ipicuia, which came from the same bed, may be founded on an Imperfect cast 

 of this species, but aa he describes the aperture as "subquadrate" and speaks of oblique lines of growth, 

 we hesitate to say that It Is. Still, he may be mistaken. 



Formation and locality. Shalt* of the Black River group, Minneapolis, St. Paul, Cbatfleld and Foun- 

 tain. Minnesota. Also at Belolt, Wisconsin, and In the upper part of the Stones River group at llih 

 Itrldge, Kentucky. 



GoUed&ms. Geological and Natural History Survey of Minnesota: E. (>. Ulrlch. 

 thane* RegitUr, No. 4050. 







Genus CYRTOSIMKA. n. gen. (Ulrich.) 



Like Subuliles excepting (1) that the shells are shorter, especially in the spire, 

 the length of the aperture generally exceeding half of the total bight of the shell; 



hat the shell is carved with one side of the outline straight, the other strongly 

 arcuate, or the axis may be spirally turned so that the shell curves first in one 

 direction and then in another; and (8) the truncation of the lower extremity of the 

 aperture is not so apparent. Types, C. tort His 1*1 rich an<l >'/</< ///< rentricosux Hall. 



\\ have separated this type of shells from SulmlHi-s. t<> which it was hitherto 

 referred, not only because it is strikingly different from the typical forms of that 



