GASTROPODA. 839 
Scenella magnifica.] 
We can scarcely doubt that the Minnesota specimens above described really 
belong to Billings’ Metoptoma superba. They agree exactly with his figures and 
description except that we see nothing of the “obscure carination” which he says 
“runs from the apex to the margin on one side.” Perhaps it is an abnormal feature. 
As to Conchopeltis minnesotensis, Walcott’s description, in the absence of figures, is 
too indefinite for identification.* Still we do not think it likely that his types, 
which we sought to see but failed, are distinct from the specimens here referred to 
S. superba. Nor do we believe that they are strictly congeneric with his C. alterna- 
ta, the type of his proposed genus Conchopeltis. (See ante page 823.) 
Formation and locality—Stones River group, Cannon Falls, Minnesota. Walcott’s locality for his 
C. minnesotensis is given as “four miles below Medford, Cannon River, Minn.” Billings’ type is from the 
Black River limestone at Pauquettes rapids on the Ottawa river. 
Collections.—Geological and Natural History Survey of Minnesota; W H. Scofield; KE O. Ulrich. 
Museum Register, Nos. 3394, 7350 and 7490. 
ScCENELLA MAGNIFICA, 7%. Sp. 
PLATE LXXXII, FIGS. 7—9. 
Of this species we have only a single specimen which was found in association 
with the preceding species at Cannon Falls. It seems to have had surface markings 
like S. superba, and we believe it is closely related to that species. But the hight 
of the shell is so much greater that we cannot do otherwise than regard it as 
specifically distinct. Comparing other features we find that the aperture also is 
more arched and the whole shell more compressed laterally so that the outline 
from above is decidedly elliptical instead of subcircular. Length 76 mm.; width 
58 mm.; hight about 75 mm. The specimen is imperfect at the apex. 
Formation and locality.—Stones River group, Vanuxemia bed, Cannon Falls, Minnesota. 
Collection.—Geological and Natural History Suryey of Minnesota. 
Museum Register, No. 3405. 
SCENELLA BELOITENSIS, ”. Sp. 
PLATE LXI, FIGS. 33 and 34. 
Shell exceeding medium size, obtusely conical, the hight less than one-half of the 
smallest diameter; apex subcentral; aperture nearly or quite horizontal, somewhat 
irregularly subcircular. Surface of cast showing fine radiating striz, about ten in 
5 mm., over the marginal portion. Muscular imprints occupying the greater part of 
the inner half, apparently divided into four sets, each consisting of three or four, 
scarcely distinguishable, coherent scars. Length 28 mm.; width 26 mm.; hight 
10.5 mm. 
; *Walcott’s description reads as follows: ‘ Shellobtusely conical, base slightly elliptical; apex excentric, variable in 
different individuals; hight one-half the greatest diameter. Shallow undulations of growth occur one-half the distance to 
the apex, finer lines near the margin. Substance of the shell not preserved.” 
