968 THE PALEONTOLOGY OF MINNESOTA. 



[Lophosplra humills. 



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. Scofleld; U. S. 

 National Museum. 



Museum Register, No. 7384. 



LOPHOSPIEA HUMILIS, . sp. (Ulrich.) 



PLATE LXXII, FIGS. 12-15. 



Eight 7 mm. to 14 mm.; apical angle 80 to 90. Related to L. Mcincta Hall, 

 but distinguished at once by its low spire and two carinse instead of one on the 

 upper slope of the whorls. One of these carinae 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. E. O. Ulrich. 



LOPHOSPIRA PROCERA, n. sp. (Ulrich.) 



PLATE LXXII, PIG. 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. 

 Colkction. E. O. Ulrich. 



LOPHOSPIRA SERRULATA, Sailer. 



PLATE LXXII. FIGS. 51-55; PLATE LXXIII, FIG. 57. 



Murchisonia tricarinata (COIIRAD) HALL, 1847, Pal. New York, vol. i, p. 178, pi. xxxvm, fig. 6c (not 

 flgs. 6a and 66); WHITFIELD (part.) 1882, Geol. of Wis., vol. iv, p. 219. 



Murchisonia serrulata SALTKII, 1859. Can. Org. Rem., decade 1, p. 20, pi. iv, flg. 1. 



Murchisonia helicteres (part.) WHITFIELD, 1882, Geol. of Wis., vol. iv, p. 220, (not SALTEK, 1859, Can. 

 Org. Rem., decade 1, p. 21, pi. iv, flgs. 24.) 



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 



