968 THE PALEONTOLOGY OF MINNESOTA. 
[Lophospira humilis. 
Formation and locality.—Not uncommon in the Richmond group of the Cincinnati period at several 
localities in Fillmore county, Minnesota. The majority of the specimens were collected in a railroad cut 
about two miles east of Spring Valley. 
Collections—Geological and Natural History Survey of Minnesota; E. O. Ulrich; W. H. Scofield; U. 8. 
National Museum. E 
Museum Register, No. 7384. 
LopHosPirA HUMILIS, ”. sp. (Ulrich.) 
PLATE LXXTUI, FIGS, 12—15. 
Hight 7 mm. to 14 mm.; apical angle 80° to 90°. Related to ZL. bicincta Hall, 
but distinguished at once by its low spire and two carine instead of one on the 
upper slope of the whorls. .One of these carine is close to the suture, the other 
about midway between the suture and the peripheral band. 
Formation and locality—Upper part of Trenton group, Mercer and Boyle counties, Kentucky, and 
Hartsvilie, Tennessee. 
Collection.—K. O. Ulrich. 
LopHospirA PROCERA, n. sp. (Ulrich.) 
PLATE LXXII, FIG, 9. 
Hight about 30 mm., width about 16 mm., apical angle 43° to 45°. 
The surface markings show that this species belongs to the Bicincta subsection, 
the direction of the lines of growth on the concave space beneath the peripheral 
angle, though oblique, being approximately straight. The comparatively great 
hight of the shell distinguishes it from the other members of its subsection. 
Formation and locality.—‘‘ Central limestone” of the Stones River group, Murfreesboro, Tennessee. 
Collection.—E. O. Ulrich. 
LoPHOSPIRA SERRULATA, Salter. 
PLATE LXXII, FIGS. 51-55; PLATE LXXIII, FIG. 57. 
Murchisonia tricarinata (ConRaAD) HALL, 1847, Pal. New York, vol. i, p. 178, pl. xx xvi, fig. 6e (not 
figs. 6a and 6b); WHITFIELD (part.) 1882, Geol. of Wis., vol. iv, p. 219. 
Murchisonia serrulata SALTER, 1859. Can. Org. Rem., decade 1, p. 20, pl. Iv, fig. 1. E 
Murchisonia helicteres (part.) WHITFIELD, 1882, Geol. of Wis., vol. iv, p. 220, (not SALTER, 1859, Can. 
Org. Rem., decade 1, p. 21, pl. 1v, figs. 2—4.) 
Hight 20 to 45 mm.; apical angle of upper volutions 56° to 62°. Volutions five 
to seven, closely coiled in the upper part of the spire but in fully grown individuals 
the last whorl descends very rapidly and becomes widely separated from the 
preceding one; volutions sharply and very prominently carinated on the periphery, 
the flange-like and obliquely undulated carina with a delicate line on each side of 
its base; carina frequently terminated by a series of spine-like prominences 
producing the serrated edge that has suggested the specific name. Sometimes the 
