Figs. 1 to :7 
1 
2and 3 
4 
5and 6 
7 
Fig. 8 
Fig. 9 
Vig. 10 
Figs. 11 to 14 
il 
12 
13 and 14 
Figs. 15 to 17 
15 
16 and 17 
Figs. 18 to 20 
18 and 19 
20 
Fig. 21 
Fig. . 22 
Figs. 23 to 29 
23 to 26 
27 
28 
29 
PLATE LXXIII. 
LOPHOSPIRA PERANGULATA Halll Sp... . 2:22 ce sree cece ee cee ete es eee cet ees 
Apertural view of a rather large specimen. 
Opposite views of two small shells. : 
An unusually large specimen, the last whorl of which is free. 
Two specimens of the average size, the first with the apical angle a trifle wider 
than usual. 
Under side of a specimen showing the umbilicus. Stones River group (Safford’s 
‘‘ Central limestone”), Murfreesboro, Tennessee. 
LOPHOSPIRA ACUMINATA U.andS. (or var. of PERANGULATA).......-...--++--+-- 
An excellent specimen of this variety, from the Richmond group, near Rich- 
mond, Indiana. 
OREO INA Chae AHS) (OMG pwodcasasasoaeaboo odaso open 90 ca0uoD Jedd boDGOdEEdadc 
Dorsal view of the largest and best of seven specimens of this species. Safford’s 
‘‘Central limestone” of the Stones River group, Murfreesboro, Tennessee. 
JDO SEERA IICWIRSVA WiC s coo so nocconeconuescoocondootaedeecusnbus SuacoasecnDD 
Anterior view of the best of two sachs, the outer side of the aperture 
restored. Trenton group, Burgin, Kentucky. The comparative flatness of the 
upper slopes and the hight of the spire, considering the size of the mouth, are 
the principal peculiarities when compared with species like L. perangulata. 
LOPE RANT TN AGN IW AVaGl Syocsgngsoaco0e sce cacbobounnbooogdeaoOdod4 So DDO coSuC 
An imperfect silicified shell from the upper part of the ‘Trenton group near Bur- 
gin, Kentucky. ,.This specimen may not belong to this species. 
Cast of the interior of this species. Fusispira bed, Trenton group, Decorah, 
Iowa. Geological and Natural History Survey of Minnesota, Museum Register 
No. 7370. 
Opposite views of another cast, this being from the same horizon as the preced- 
ing, at Kenyon, Minnesota. 
WOPHOSEDRABPE RAC UICAN UMA GUS raciernsle) stan stot nerelcre eet Ne elenieinic cust ts ee tielersscitis ofefeterelore 
An unusually depressed specimen. Most of the specimens found with this are 
like the next, only not so large. Black River shales (Rhinidictya bed), St. Paul, 
Minnesota. 
Opposite views of the specimen which we regard as the type of the species. It is 
from the upper division of the Stones River group, at Lebanon, Tennessee. 
MOLHMOSEERANSUMNERENSIS (Sa mOLGn Sra senes avers sists see re eis cece yale aiciaveis ora -/ecrcbalere eters 
Opposite views of the original type of this excellent species. Upper part of Tren- 
ton group, Sumner county, Tennessee. 
Another good specimen from the same locality. 
BOPHOSPIR AER ODUCT AM Ulli Clip tmavecyrs terete yates eiabetatere tie teiciers ties ticieleicitisie: smeictetere cael eke 
Apertural view of the type of this important species. Trenton group, Nashville, 
Tennessee. 
ILOMEOM IN CON OMDIO AUN Ns como edbe soca cneabdsdnoodenabHo do ccobuEouCuCenooGUCO 
Front view showing the general form, umbilicus and inner lip of the type of this 
species. Trenton group, Nashville, Tennessee. 
IDOI SNA: Lino DON SUG hol Siseades saadacasobmcar cuudiacncoooon 46 Hepes doo mae ooee 
Four representative specimens, showing slight variation in the apical angle and 
in other unimportant respects. Upper Trenton, near Burgin, Kentucky. 
An example from middle Tennessee, agreeing in every respect with the Ken- 
tucky types of the species. 
Under side of a cast of the interior. 
Part of the last whorl of another Kentucky specimen retaining the lamellose sur- 
face markings in an unusually good state of preservation; 2. 
973 
979 
975 
977 
976 
978 
976 
973 
