Figs. 1 to 4 
1 
2 
3and 4 
Fig. 5 
Figs. 6 to 9 
6and 7 
8and 9 
Figs. 10 to 13 
10 
11 
12 
3 
Figs. 14 to 18 
14 
15 
16 and 17 
18 
Fig. 19 
Figs. 20 to 26 
20 to 23 
24 to 26 
Figs. 27 to 29 
27 
28 
29 
Figs. 30 and 31 
Figs. 32 to 37 
32 and 33 
34 
35 to 37 
Figs. 38 and 39 
38 
39 
PLATE LXII. 
CARINAROPSIS (CYMBULA' Hallinscacisa cece sees ue eee teen els et aale ay eis paeialh a be 
Dorsal view of a specimen imperfect at the sides. 
Diagramatic longitudinal section. The dotted line represents the outline of the 
lateral margins in a profile view. 
Two views of a broken specimen showing the internal septum. 
Upper part of Trenton group, near Danville, Kentucky. 
CARINARORSISHE SELANIAT AG Uilni Chima eeeitcetrte teeta ieraetaveil = sees erat ete beiarel-s er eieralalcte tetera 
Dorsal view of the imperfect type of this species. It is a cast of the interior. 
Upper part of Trenton group, Covington, Kentucky. 
CARINAROPSISPA CURA Wr andi Siva. seth. seen eeat clas eee eel abere tibie cc eiajemitete ste veiete 
Dorsal and profile views of a cast of the interior of a young shell. Black River 
group, near Fountain, Minnesota. 
View of the interior of a very large example, and a diagrammatic longitudinal 
section of the same. Black River group, near Cannon Falls, Minnesota. 
CABINAROPSISTCUNUI aH Elallllenneeree ce see eee Refer sey ahevsisis) heisisi pans ease 
Dorsal view of an average shell. The margin restored from other specimens. 
Diagrammatic longitudinal section of same showing outer surface only of the 
operculum (at ‘‘O”). 
Another specimen showing a sharply defined dorsal band. 
Inner surface of original of figure 10, showing the septum and, above it, a triangu- 
lar plate which we regard as the operculum. 
Trenton group, Nashville, Tennessee. 
CARINARORSISEREALE RAW Sard eSOMr-laieliacieisioiitelsiete rieicicieienncrtersaciiension etme 
A cast of the interior of this species from the Ctenodonta bed at St. Paul 
Diagrammatic longitudinal section. 
Interior and profile views of an imperfect shell. 
A specimen broken so as to show the inner surface of the septum. ‘This, like the 
preceding, is from the Ctenodonta bed at Chatfield, Minnesota. 
CARINAROPSISMMENTEMAS (Wea dsSnnsecee seat aces eee ee oe eee ee keine 
Dorsal view of the type and only known specimen of this species. Black River 
group, Cannon Falls, Minnesota. 
(QUAM MOM AUIS (P)) WIRKAGOATOS Wp BC! S\cacooo sosaseboccvsvnoGcaubL osucbeooss cond banne 
Four views of a large cast of the interior, Beloit, Wisconsin. Collection of the 
University of Wisconsin. 
Three views of a smaller testiferous example, from the Ctenodonta bed of the 
Black River group, near Cannon Falls, Minnesota. 
CYR TOLITESORNATUSH CONTAC sales nee «eRe ae iss celina oe arto oe oieieeiee 
Lateral view of a large specimen preserving some of the shell. The surface orna- 
mentation is too delicate to be drawn of the natural size, and only a few of the 
transverse lines are represented in the figure to give an idea of their direction, 
Lorraine group, Cincinnati, Ohio. 
Small portion of the surface markings on the dorsal slopes of another specimen 
from the same locality, 10. 
Dorsum of a third example, from the same locality, x4. 
CYRTOMMEKS ORNADUS Var eMINOR PU angi Say cea «er bleanis caseemie cis +0 arcane 
Lateral and dorsal views of a specimen of this variety, x2. Clitambonites bed of 
the Trenton group, Cannon Falls, Minnesota. 
CYBROMIPES RETRORSUSUMEICHS 5 fyooH oe gard am pda tele ostream secre cee sree erase «os 
Two views of a large silicified example showing the usual characters of the species. 
The backward sweep of the transverse markings on the dorsum and the small 
sutural fold are the principal distinctive features when compared with OC. orna- 
tus. Trenton group, Tennessee. 
Surface of a specimen from Kentucky, x10. 
Three views, x2, of a smaller silicified shell. Trenton group, Mercer county, 
Kentucky. 
CYRTOLITES RETRORSUS Var. FILLMORENSIS U. and S...............0.2-. ssc cece 
One of the largest and best specimens of this variety seen. It is chiefly a cast of 
the interior. Black River group, near Fountain, Minnesota. 
The inner whorls of another specimen from the same locality magnified (10) to 
show their rounded sides and the ornamentation. 
927 
928 
929 
860 
86] 
861 
* Unfortunately the description of this new species was overlooked. Still, it isso well illustrated thatit seems highly 
improbable that any one can fail to recognize it. Of its peculiarities we mention the surface markings and the form of the 
dorsum which at the center is merel 
by Prof. J. M. Safford and kindly submitted by him to one of the authors for description. 
angular instead of sharply keeled. The species is founded on seyeral specimens found 
