Figs. 1 to 5 
land 2 
3 to 5 
Fig. 6 
Figs. 7 to 10 
wo) 
10 
Figs. 11 and 12 
11 
12 
Figs. 13 to 18 
13 and 14 
15 to 18 
Fig. 19 
Figs. 20 and 21 
20 
21 
Figs. 22 to 25 
22 
23 to 25 
Fig. 26 
Figs. 27 and 28 
27 
28 
PLATE LXXIX. 
PAGE. 
HOLOPEA INSIGNIS U).jand '(S/ctktocsm ome one eiseeeretie i eran eee tee enone Gite 1065 
Opposite views of the interior cast of a young shell. The bight is relatively 
greater than in fully grown individuals. Stones River group, Minneapolis, 
Minnesota. 
Three views of a large cast. This specimen is so sharp and clean that it may be 
a cast of the exterior rather than of the interior. Stones River group, Cannon 
Falls, Minnesota. 
HOLOPHA (CONCINNU LAGU, FANG IS) an. nee am eee eine ceicckiniee hee nenoe ene eiaee 1066 
A cast of the interior, the last whorl with obscure lines of growth. Stones 
River group, Beloit, Wisconsin. 
HOLOPEA: ‘APPRESBA (U. anG’S).iecs iat ost nls coryamtita se tee istee ae emecoee nem iisierine 1065 
Three views of a small but entire cast of the interior, giving a good idea of 
the peculiarities of the species. Clitambonites bed, Goodhue county, 
Minnesota. 
Under side of a larger cast. Geological and Natural History Survey of Minnesota, 
Museum Register No. 6765. 
HOLOPEASEXCELSA "Us (ANd YS Asti ieeeee cet teustasies etait ne lee rerio se ene eee 1067 
Apertural view of an incomplete cast of the interior. Fusispira bed, Wykoff, 
Minnesota. 
Dorsal view of a nearly complete cast from the same locality. 
HOLOPEASPYRENE: ‘Billings, o3:./ses irene ace sscleve cso slsicoale clare emiac eee aces 1067 
Two views of a cast of the interior, the inner whorls restored. Trenton group, 
near Cannon Falls, Minnesota. 
Four views of a cast of the interior of a young specimen. Fusispira bed, near 
Cannon Falls, Minnesota. 
HOUOPEAY Var, SPAR ViUUANUITIGI = [e 1-1 oats slsicleieierse sielcetep e's heceuauoaonedossooTO. 506 
Dorsal view of the largest of three specimens. Upper Trenton, near Burgin, 
Kentucky. 
HLOLOPEA “ROTUNDACU. Mand: Slee ciarlesisiecctcie sms tor oie) sioe aims teineleregecioiietde resis aaiere tees 1066 
Perfect silicified shell, showing the aperture, minute umbilicus, and general 
form of the shell. Trenton group, Hartsville, Tennessee. 
A much larger specimen, presumably of this species, from the Stones River 
group at Dixon, Illinois. 
ELOLOPHA) VAMP AW. an AS cates isis isa Mie toreteate ee ietalo le eie lore elousietaie stsic eusiareyalovevetntate sie 1065 
An average example of this species. The specimen is a cast of the interior 
and shows broad varices of growth and rather obscure traces of revolving 
lines. Stones River group, Cannon Falls, Minnesota. 
Body whorl of a large specimen, strongly marked with wrinkles and lines of 
growth. The specimen appears to be a cast of the exterior and is from 
Cannon Falls, Minnesota. Geological and Natural History Survey of 
Minnesota, Museum Register No. 5836. 
HOLoPrEa ‘siwnr71s Wand ‘Sic see se ase oe oe ce eee OER OEE Ree 1066 
Dorsal view of an average example of the form which we have separated 
provisionally from H. ampla and H. obliqua under this name. Shales of the 
Black River group, Fillmore county, Minnesota. Geological and Natural 
History Survey of Minnesota, Museum Register No, 7881. 
HOLOPEA SUPRAPLANA (Us ANGEStecei-cince seielelsiete elersiasicieteee islet clei eeiieieicateiersertaniere 1068 
Dorsal view of a cast of the interior. Lower part of Fusispira bed, Kenyon, 
Minnesota. 
Apertural view of the largest specimen seen. ‘Though a cast of the interior, 
it gives a good idea of the strongly inrolled thin inner lip. Kenyon, 
Minnesota. 
