Figs. 
Figs. 
22, 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
8) 
10 
11 
12 
13 and 14 
15 to 20 
15 
16 and 18 
17 
19 
20 
21 to 27 
21 
24 and 25 
23 
26 and 27 
28 to 30 
28 
29 and 30 
31 to 3d 
31 and 32 
33 
34 
35 
36 to 39 
40 to 44 
40 to 48 
44 
45 to 47 
45 and 46 
47 
48 and 49 
50 and 51 
50 
PLATE LXIII. 
PROTOWARTHIA CANCELGATA HallUSpcpieccctieeereemecieninceeict eeieenan cee eee 
Two views of a Jarge cast of the interior, retaining a little of the shell in the 
umbilicus and having several strong wrinkles of growth near the aperture. 
Ctenodonta bed of the Black River group, West St. Paul, Minnesota. 
Apertural view of a shell having the mouth less expanded than usual. Ctenodonta 
bed, Goodhue county, Minnesota. 
Three views of an entire shell, representing an average for the species in size and 
proportions. Ctenodonta bed, Chatfield, Minnesota. 
Two views of a rather small cast of the interior from the Clitambonites bed of 
the Trenton group in Goodhue county. This is a fair sample of the species as 
it occurs in this bed. 
Surface of a specimen from the Utica group at Covington, Kentucky. x4.5 and x9. 
In certain lights the longitudinal lines look more like a series of minute gran- 
ules. The right side of the figure corresponds very nearly with the center of 
the sinus. These fine markings are but rarely preserved on Minnesota speci- 
mens. 
Outline, in a dorso-lateral view, of left lobe of outer lip of an average example of 
the species from Covington, Kentucky. 
Outline of sinus, lobes and dorsum of same, viewed from above. 
Outline of same specimen in a view from below. 
Surface of left lobe of outer lip, *4.5, and a dorsal view of a more globose and 
more delicately marked variety, occurring in the Utica group at Covington, 
Kentucky. 
PROTOWARTHIA RECTAN G UG ARIS a Wei QGus ee lele elerelereraicialsV-tasvereisieveieie eee ieiein se eee ieineters 
Lateral view of a very large specimen—a partial cast of the interior—from the 
Stones River group, at Mineral Point, Wisconsin. 
Lateral and basal views of a cast having the central part of the back unusually 
prominent and marked with wrinkles of growth. Beloit, Wisconsin. 
Dorsal view of an average cast of the interior. Beloit, Wisconsin. 
Outline of right lobe of outer lip of same. 
Outline of sinus, lobes and dorsum of same viewed from above. 
PROTOWAR TATA LPERYV OLUsDAT UW). LD Cesare iaeieiteelcpivtotetalelolieeieiets  mictereivic imei ecient 
Basal view of an incomplete shell showing the granulose expansion which spreads 
from the aperture over the sides and back of the lower part of the shell. Black 
River group (Ctenodonta bed), St. Paul, Minnesota. 
Apertural and lateral views of a small but well preserved shell of the natural 
size, and the lateral view <2, showing the granulose layer spreading over the 
basal or inner half of the last whorl and the grano-lineate extensions curving 
around the umbilical callosity. Black River group, Chatfield, Miunesota. 
Transverse section of the outer whorl of a cast. 
Two views of an unusually large cast of the interior from the Black River group 
of Mercer county, Kentucky. 
IPROTOWARTHVAY GRANTSPREATAS (UNTICH oictere cto \ntoia cle! ois elslajels)siata/e\eielole;sfelalala\s|aiatelals|aisintntaiste 
Dorsal View of an average example of this species. Utica group, Covington, Ken- 
tucky. 
Apertural and lateral views of another specimen, from the same locality, showing 
the form of the mouth and the extent of the grano-striate expansion. 
PROTOWAR TAPAS Pi AN ODORS AIA MUTI ING rete reteieta tere all oteleleleliatalotet sted afainio delete tele t=teietie l= 
Dorsal and lateral views of a specimen that has evidently suffered slightly from 
lateral compression. 
Outline of same in a basal view. Utica group, Covington, Kentucky. 
Dorsal view of another example, from the same locality, showing normal propor- 
tions. 
Outline, as seen in a basal view, of another specimen from Covington, agreeing in 
all respects with other specimens of this species except that it is too wide. 
PROTOWARTHIA CONCINNA U. and S............ccceseccncecesees pete eceeeecesees 
Four views of the type of this species. Richmond group, Spring Valley, Minn- 
esota. 
PROTOWARTHUA) SUB CONDE RRSS Ae EN wate ete teotetn sala lois) elaloteielstateletetanetelatetette rola <fateratadetsteiatots 
Four views of the best specimen seen. It preserves the two inner layers of shell 
only and these even are absent in the upper part of the dorsum where the 
internal cast is exposed. Richmond group, Versailles, Indiana. 
Part of the surface of a smaller specimen showing the great width of the sinus 
and the relative narrowness of the lateral lobes. Butler county, Ohio. 
Leatouwonig-winwene. Ww Oisiviy.© Olbilddesayaagueddoradebassan obb0bcsds coconebacdosor seocbe 
Dorsal and lateral views of a good but rather small cast of the interior, showing 
a strong terminal constriction and several of minor depth farther down. Lower 
part of Trenton group, Danville, Kentucky. 
View from above of another specimen showing one of the constrictions and lines 
of growth beyond it. Mercer county, Kentucky. 
BUC ANA WS TMT Ts AUT TNG OL Mverm rat rete caters eiete sie ele obei= al olaielotetniiniote! piete isteto}=nptstelelst=tscstetrtefeteieverarels 
(See also plate LXVII.) 
Dorsal and upper views of a good cast of the interior, showing, among other fea- 
tures of the species, the deep sinus and long slit. Richmond group, Richmond, 
Indiana. 
BELLEROPHONVOAPASRS MULTI OH ee jecvels sce aroibyseerataysic\e ole iteimie/s/ereialstale’e yatapnvarersle oraietetarete eter 
(See also plate LXIv.) . 
A specimen preserved in soft shale, from the upper part of the Utica group at Cin- 
cinnati, Ohio. The hight of this specimen has been considerably reduced by 
pressure, but it serves very well in showing the expansion of the aperture, the 
sinus and the surface markings. 
Apertural view of a specimen from the Lorraine group at Covington, Kentucky, 
that is largely covered by an incrusting bryozoan. The outline and thickness 
of the latter is indicated by the irregular line about the lower part of the figure. 
868 
871 
870 
871 
874 
873 
874 
892 
921 
