Figs. 24 and 25 
Figs. 26 and 27 
Figs. 28 to 31 
28 
Fig. 32 
Figs.33,34,36,37 
33 
34 
Fig. 35 
Figs. 38 and 39 
Figs. 40 and 41 
GYRTOSPIRA TOR DTUAS WUTC cere stiern satelet- micterslolotetelelete etek (ele tele ete ol eleinia eee eer eetrerie 
Opposite views of a silicified shell of this species. Lower division of the Stones 
River group, Murfreesboro, Tennessee. 
FUSISPIRA PLANULATA U.. ‘amd Ss eciciicc neice cleerrerteiciets clots eee eistelanie meetin a iets tote 
Opposite views of the type of this species. The specimen is an excellent cast of 
the interior from the Fusispira bed of the Trenton at Eagle Point, Iowa. 
IUSISPERA -ANGUSTA U). ANG SS Aeeorirareteteretsie ey ctetatetetetetes nts mle e nic ia ereyereletere el ein sieht ier oie eee 
Apertural view of the lower whorls of a large specimen. It is a cast of the 
interior, but as the shell was not very thick, it gives a good idea of the external 
form ofthe volutions and mouth. Clitambonites bed, Cannon Falls, Minnesota. 
Dorsal view of a more complete cast, from the same locality, showing the compar- 
atively great hight of the volutions. 
A third cast having somewhat deeper sutures than usual. Cannon Falls, Minnesota. 
Somewhat loosely coiled cast of the interior, from the same bed and locality. 
PUSISPIRA. ANGUSDA, var SUBPLAN An UW calGSisae caeme smilecicicetsnitisis sete neers 
Ventral view of one of the two specimens upon which this variety is founded. 
Clitambonites bed, near Cannon Falls, Minnesota. 
SPORT LUAPIGHUIH Tei oy BUN CICIh, yodin SenPaMReadur cond. Sone QEpocRuOEnsoAoDoCOdebucs bs sonazae 
Testiferous fragment with banded suture line. Black River group (Ctenodonta 
bed), Chatfield, Minnesota. 
Apical portion of a shell, preserved partly as a cast of the interior. Stones River 
group, High Bridge, Kentucky. 
An imperfect, macerated shell from High Bridge, Kentucky. 
Interior cast of the spire showing that the apical whorls are not filled with solid 
material as in the more typical species of Subulites. Stones River group, Beloit, 
Wisconsin. 
SUBULELES eG Oi AG TS OTE ty cree latete el caveat miata c= oie oteyeratalatalatsteteleraleiyaietelsfeleyalcia/<feteeieierste 
(See also plate LXXNII, figs. 47 and 48.) 
Interior cast of the last volution, showing the long and remarkably slender canal. 
High Bridge, Kentucky. 
EUSISPIRA SUBMUSIMORMIS) Eel! Sie 2 = cere ctore «niece wleyetwin wit oteleislelotel viele) sfuimie talaYele¥=t= ree 
Opposite views of an incomplete cast of the interior, showing the convex whorls 
and rather wide mouth which are characteristic of this species. Fusispira bed, 
Goodhue county, Minnesota. 
MERKOSPIRA SUBCONIOA UW. ANG SE. 6. occ coe ce nee ee emma winininie wt sisininis vielelalelsel=ie = eit 
Two views of the type of this species. Richmond group, near Spring Valley, Min- 
nesota. 
1079 
1079 
1073 
1072 
1077 
1080 
