Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
1 to 3 
1 
2and 3 
4and 5 
6 to 8 
6 
fi 
8 
9 and 10 
9 
10 
ll to 15 
11 to 14 
15 
16 to 18 
PLATE LXXVI. 
MAGLURINA CUNEATASWIGHGMI oe a. mceoe eee eens tana nce en Cee eee 
(See also plate LX XXII.) 
Upper side of an average cast of the interior of this common species. showing the 
small umbilicus. 7 mm. less than natural size. Geological and Natural His- 
tory Survey of Minnesota, Museum Register No. 8440. 
The lower side and a lateral view Of another specimen. 5 mm. less than natural 
size. Maclurea bed of the Trenton group, Stewartsville, Minnesota. Geologi- 
cal and Natural History Survey of Minnesota, Museum Register No. 8441. 
MACHURINA MANITOBIONSIS (WiDibeAVES 1a: co cciem ce ecince: ae eterceticn ite eens cians 
(See also plate LXXXN.) 
Two views of a cast of the interior. Trenton group, Lime City, Minnesota. 
Geological and Natural History Survey of Minnesota. Museum Register No. 
4105. 
‘TROCHONEMA: OBSOLE TUM WU In Chinen ss eaerhcen eee eee EEE errr ene aeneeee 
A finely preserved example of the natural size. Upper Trenton, near Burgin, 
Kentucky. : 
Lateral view of same 2.5, showing surface markings and obsolescence of 
revolving ridges on the last whorl. The ridges are quite distinct on turns 
preceding the last. 
Basal view of same x1.8. 
TROCHONE MATA RCDAT UM WITCH erm ectcatic setree aeleeeeeenice nApotg oopdaagadooOs eS 
Outline view of the type of this species. Trenton group, near Burgin, Kentucky. 
Apertural view ofsame x2. A few of the fine lines of growth are faintly indicated. 
The peripheral band is unusually narrow for species of this genus, and might 
easily be mistaken for the band of a pleurotomarian shell. 
TROCHONEMA>ROBBINSI_U ., (ANG JSsci.-iccis’cis ee fates eeleieaistom tere ioyete ree nisietoaiee eincioroe 
Four views of a large cast, in part both interior and exterior, imperfect at both 
extremities. The even slope of the surface from the suture to the peripheral 
band is one of the most striking features. Fusispira bed, Wykoff, Minnesota. 
Geological and Natural History Survey of Minnesota, Museum Register No. 7516. 
A small cast of the interior from the same locality. 
TROCHONEMA® NIOTA: EVAN SPs cteicle ove cislets cies eicie = ois wie fo iaveuicls we lerern cies eieteienetetataveters eleteve stots 
Three views of the nearly entire cast of the interior upon which this species is 
founded. Stones River group, Beloit, Wisconsin. 
1041 
1054 
1054 
1053 
1052 
