GASTROPODA. 975 
Lophospira decursa.] 
close to the umbilicus which is not seen in L. medialis. But the peculiarity chiefly 
relied upon is the unusual fact that the apical angle of the first four or five whorls 
is only about 42°, while with the last turn the angle is increased to quite 53°; and 
taking only the last two volutions the angle is over 60°. 
The marked increase in the apical angle distinguishes this species from all 
others now referred to Lophospira. Aside from this feature L. perangulata agrees 
nearly as well as L. medialis. Differing in the same manner as that species, the 
perangulata varies further in having constantly a carina beneath the peripheral one 
of which no sign is to be seen on L. abnormis. 
Formation and locality—Upper part of the Trenton group, Covington, Kentucky. 
Collection.—E. O. Ulrich. 
LopHosPirRA DEcuRSA, ”. sp. (Ulrich.) 
PLATE LXXIII, FIG. 10. 
Hight 22 to 28 mm.; apical angle 40° to 44°. Volutions about six; peripheral 
carina situated unusually low, causing the slope of the upper side to be uncommly 
steep; upper slope flat or with a slight swelling near the suture; concave space 
between peripheral and lower carine relatively narrow; no umbilicus. 
Near L. perangulata, but is a larger and relatively narrower shell, with the 
peripheral carina lower and the concave space beneath it narrower. The absence 
of an umbilicus is also distinctive. 
Formation and locality—Trenton group, Burgin, Kentucky. 
Collection.—H. O. Ulrich. 
LopHospira PRODUCTA, ”. sp. (Ulrich.) 
PLATE LXNXIII, FIG, 21. 
Hight about 42 mm.; greatest diameter 18 mm.; apical angle about 32°. Volu- 
tions about ten, strongly angular, rather high, the upper slope rather wide, concave 
to the suture except on the last whorl on which there is a slight thickening of the 
upper edge (not a carina) causing a slight deepening of the suture as we follow it 
down the spire; peripheral band prominent, rather thick, situated below the center 
of the exposed part of the upper whorls; lower carina well developed, exposed on all 
the volutions, its lower side forming the upper border of the suture line. Umbilicus 
open, comparatively large, the base of the shell rounding less abruptly into it than 
usual. Aperture rather high, straight upon the inner side, angular below; inner lip 
comparatively thin. Surface markings obscurely preserved in the specimen, 
apparently as in L. perangulata. 
