GASTROPODA. 



.!.) 



(Safford) the last volution is relatively iinn-li higher ami the peripheral angle not 

 nearly BO prominent. In -.'ii.T.tl the species may be said to occupy an intermediate 

 position between L. rlevtita and I.. multi<inimn Miller and Dyer. 



formation and locality.- -Tli>' type specimen U fn.iu th.'Cilade lime-done nf th.- Stoti.-, Klver group 

 nnessee. We hate several li .- from the o.-n ><innta bed <>f the Hlaclc 



1'aul, Minnesota, which may belong to the Mine species. 



(Xfcrtion.-E. O. rirlch. 



KLKVATA, n. 8p. 

 I'l VTB l-XXIII. FIOS. II 11 



to 50 mm.; apical angle 52 to 54. Volutions about six, contiguous 

 Kut ilex-ending mpiilly, an unusually large proportion of each exposed in the spire; 



: "Ill-nil carina moderately prominent, thick, situated about midway between the 

 top and bottom of the whorl; beneath it a wide, slightly concave space, not very 

 distinctly defined below by the obtuse lower angulation beyond which the surface 

 turns rapidly inward to the small umbilicus; upper slope slightly concave to the 

 Miture, apparently never with a carina. Mouth very moderately drawn out below, 

 the inner lip more or less curved and turned outward instead of being vertical as in 

 most of the related species. Lines of growth rather obscure, curving strongly 

 backwards to the peripheral band. 



Very much like McCoy's Murchisonia gyrogonia, but if his figures are reliable 

 then the two species must be quite distinct since the very slight retral curve in the 

 lines of growth as shown in McCoy's illustration proves that his species belongs to 

 the Bicincta section of Lopltospira, while our elevata is an undoubted member of the 



mgulata section. Compared with American species we find that the mouth is 

 less produced below and, although the whorls are the same in number, the size of 

 the shell much greater than in L. perangulata. The Tennessee species, L. centralis, 

 is perhaps the nearest, yet we did not find much trouble in separating them. The 

 apical angle is wider in that shell, the under side of the whorls more ventricose, the 

 suture lines less oblique and the concave spaces over them narrower. 



Formation and loeatay. Five specimens from plra bed of the Trenton group at Decorah, 



Iowa, and Kenyon and 11 . t.-n 1' < > . In Goodhue county, Minnesota. Several specimens from the upper 

 part of the Tr.>nU>n in Mercer county, Kentucky, an- doubtfully referred here. 



CWtattoiu. Geological and Natural History Survey of Minnesota; E. O. Ulrich. 

 Muteum Reyutfr. No. 7370. 



H 



