Figs. 31 to 33 
31 and 32 
33 
Figs. 34 to 38 
34 
35 to 38 
Fig. 39 
Figs 40 to 42and 47 
40 
41 
42 
Figs. 43 to 46 
43 to 46 
Figs. 48 to 52 
48 
49 and 50 
51 and 52 
Figs. 53 to 56 
HELICOTOMA. SUBQUADRATA “UlTiChs<n< 21 cn aoe teeter ete ee eee 
Lateral and basal views of a specimen. The central ridge in fig. 31 is probably 
abnormal. 
Lateral view of another specimen from Murfreesboro, Tennessee, with rather 
obscure revolving lines on the vertical side. ; 
HELICOTOMA DECLIVIS Safford 
Upper side of a small but well preserved example of this sharply defined species. 
Lower division of the Stones River group, Murfreesboro, Tennessee. 
Four views of an average specimen, from the same locality. Among the peculiar- 
ities that should be especially noted, is the even slope of the umbilical cavity, 
in the bottom of which the inner whorls are not distinguishable. 
HELICOTOMA “MARGINATAUUIEENS Sian cine aes Weel ee clo atte Helene AE eevee inicyeleterie ie ateet cite 
Upper side of a specimen adhering to a piece of the limestone matrix. Beneath 
the figure, a line showing profile. Top of Richmond group, near Richmond, 
Indiana. 
OPHILETINA SUBE AKAM PANGS See carte soe aisteteists ok sic tate ctr al aia nus alors Prato enaete ee 
Upper side and a section of the free whorl of a testiferous example of the typical 
form: from the Stones River group at Dixon, Illinois. 
Portion of the free whorl of same, x2, showing the surface markings from above. 
Upper side and section of free whorl of a silicified specimen of the var. depressa, 
from Murfreesboro, Tennessee. As may be seen at once by comparing the 
transverse sections, the free whorl in this specimen is narrower than in the 
Illinois specimen. 
Portion of the upper side of the outer whorl of a specimen from Mineral Point, 
Wisconsin, x8. Geological and Natural History Survey of Minnesota, Museum 
Register No. 7302. 
OPHIGEMINA. ANGULARIS UC aud Steaeele os ee een ee 5 
Four views of the type of this species, x2. Phylloporina bed of the Black River 
group, near Cannon Falls, Minnesota. 
ECCYLIOMPHALUS CONTIGUUS Ulrich........ Bre hee ager late  etasii pele pce eakals te lols eyetate erator ste 
Apertural view of a specimen having the inner whorls slightly raised above the 
plane of the outer one. Lower division of the Stones River group, Murfrees- 
boro, Tennessee. 
Somewhat restored views of the upper and lower sides of a larger specimen. 
Two views of a small example having the inner whorls slightly depressed. 
Four views of three specimens of a totally unplaced gastropodous shell. Rich- 
mond group, Boyle county, Kentucky. 
1036 
1036 
1030 
1031 
1037 
