GASTROPODA. 967 
Lophospira fillmorensis.] 
LopHOSPIRA, FILLMORENSIS, 7. sp. 
PLATE LXXII, FIGS. 20—24. 
Hight 19 to 25 mm.; apical angle 53° to 56°; volutions about six. This form is 
represented by six casts of the interior and one macerated testiferous example. In 
its general aspect it, the cast especially, reminds one greatly of L. concinnula and it 
is not at all improbable that it is a later variety of that species. Still the testiferous 
example shows that on the exterior of the shell the spaces separating the upper and 
lower carinz from the central one are more decidedly concave or groove-like. The 
surface markings also are different, consisting as near as can be made out, of trans- 
verse lines only. These furthermore are not sharp and equal but consist of more 
delicate lines with each third or fourth stronger than the others and sometimes 
distinguishable on the casts. The direction of the lines of growth is about the same 
in the two species. JL. bicincta Hall has more ventricose whorls, less prominent 
keels and more equal and sharper surface striz. For comparison with L. perforata. 
see that species. 
Formation and locality—Trenton group, Fusispira bed, Wykof{f and Fountain, Fillmore county, 
Minnesota. 
Collections.—K. O. Ulrich; Dr. C. H. Robbins. 
LoPHOSsPIRA QUADRISULCATA, %. Sp. 
PLATE LXXII, FIGS. 10—11. 
Hight 12 to 22 mm.; apical, angle 67° to 70°; volutions about six, the last large 
and ventricose below, quadrisulcate, its upper slope with a strong subcentral carina, 
dividing two distinctly concave spaces; peripheral angle thick, trilineate; beneath it 
a wide concave band, next a sharp carina, then a narrower groove and finally the 
convex base; umbilicus very small, generally bordered by an obscure ridge. Lines 
of growth sharp, thread-like, regular, just visible to the unaided eye, curving 
gently backward on the upper slope, more abruptly bent backward and then 
forward on the peripheral angle, and nearly vertical between the periphery and the 
umbilicus. 
This beautiful shell, though closely related, is readily distinguished from L. bicincta 
Hall, and all other species now referred to Lophospira, by having a fourth carina 
and groove beneath the usual lower carina. The revolving grooves are also deeper, 
the carine being more prominent than in that species. The upper one besides is 
usually further removed from the suture. The lines of growth are precisely the 
same in the two shells excepting that on the trilineate peripheral band in L. quadri- 
sulcata they are abruptly curved, while they are straight in L. bicincta. 
