Figs. 1 to 5 
to 3 
4and 5 
Fig. 
Figs. 7 to 10 
7Tand 8 
9 
10 
Figs. 11 to 13 
11 
12 and 13 
Figs. 14 to 16 
Figs. 17 and 18 
Figs. 19 to 21 
Figs. 22 to 30 
22 and 23 
24 and 25 
26 
27 to 29 
30 
Figs. 31 to 39 
31 
32 and 33 
34 to 36 
37 
38 
39 
Figs. 40 to 43 
40 and 41 
42 
43 
Figs. 44 and 45 
44 
45 
Figs. 46 to 49 
46 and 47 
48 
49 
PLATE LXIV. 
. PAGE. 
BELLEROPHON TROOSTI (‘D’Orbigny)|SAMOLd <j. .~ «tile +e eole islet ele aie eee lee 915 
Three views of a nearly entire example from the Trenton group near Nashville, 
Tennessee. 
Two views of a specimen from Danville, Kentucky. 
BELLEROPHON TROOSTI var. BURGINENSIS Ulrich ..............2..ucece cece sceeeee 916 
Lateral view showing larger umbilicus and lesser reflection of the lower part of 
the lip than occurs in typical B. troostt. Trenton group, Burgin, Kentucky. 
BELLEROPHON (GHAUSUSMUMTICH spins crc cye ie ten ote ieraleloelels Ole sins eieleh eerie iereheererere 916 
Apertural and lateral views of a silicified shell showing the closed umbilici, 
strongly reflected and deeply excavated lower lip, the lunule on the slit-band, 
sharp and subequal transverse markings, and other peculiarities of the species 
when compared with B. troosti. Trenton group, middle Tennessee. 
Dorsal view of a smaller specimen from the Trenton at Frankfort, Kentucky. 
Portion of the back of the Tennessee specimen, x2. 
BELLEROPHON RECURVUSMUITICM Eric elec whee oc iotesters etetneietetate tier ieie ettaleietrersenereiereeteere 920 
Dorsal view of a small specimen, probably of this species. 
Lateral and dorsal views of the type, showing the marked backward sweep of the 
lines of growth on the back, with a rounded dorsal ridge as in B. troosti, and 
the lip reflected over and completely closing the umbilicus as in B. clausus. 
Lorraine group, Cincinnatj, Ohio. 
BELLEROPHON, SUBANGULARIS JUNC Wtas-palel-eitetsleteteyseieloleisicteie hints elses ee eres 920 
Three views of aspecimen preserving much of the shel] and surface markings. In 
figure 14 the mouth is turned forward alittle more than usual to show the hight 
of the dorsal carina. Richmond, Indiana. 
BELLEROPHON SUBGLOBULUS UIrich...............seeeeceees Lisehine scp seier 917 
Dorsal and lateral views of a silicified shell. Black River group, Mercer county, 
Kentucky. 
BELUEROPHONZBILENE A DUS. Wl Id Chiao ofoteitytereleieiote otelare te raiabateta eteveret stam ialetalnten sieecete ate eats 917 
Three views of a silicified shell showing, of features characterizing the species, 
the open umbilicus and the concave slit-band with its distinctly elevated bor- 
dering lines. Upper part of Trenton group, Danville, Kentucky. 
BELLEROPHON PLATYSTOMA Meek and Worthen..............--ecceeesccce cere sees 918 
Dorsal and lateral views of a smali cast of the interior with the lateral expansions. 
of the aperture broken away. Fusispira bed of the Trenton group, Cannon 
Falls, Minnesota. 
Two views of a similariy imperfect cast. This specimen was received from Prof. 
em who collected it frcm the Trenton (Ga’ena) limestone at Dixon, 
Hlinois 
An imperfect cast of the exterior preserving some of the surface markings. Cli- 
tambonites bed, Trenton group, Goodhue county, Minnesota. Geological and 
Natural History Survey of Minnesota, Museum Register No. 6765. The dorsal 
keel is quite prominent in this specimen and the slopes on each side distinctly 
concave. 
Three views of another specimen, from the same horizon as the preceding, 
retaining part of one side of the outer lip. 
Transverse section of whorl of original of figure 25, the inner line corresponds 
to the point marked ‘‘S” on that figure, the outer represents the section just 
within the apertural slit. : 
BELLE ROPHON? (SUMMITS! Wis ATi Msetetetesetw ereierete cin eis level ie late atdateredeleners siete otetsiatal fol aeteesitetetetet= 919 
Transverse section of whorl. Compare with figure 30. 
Lateral and basal views of two small imperfect casts of the exterior, showing dis- 
tinct impressions of the external lines of growth. Fusispira bed, Trenton group, 
Cannon Falls and Wykoff, Minnesota. 
ae views of a nearly perfect and large cast of the interior; from the same 
ocality. 
Dorsal view of another large specimen from the locality last mentioned. On 
the outer parts of this specimen the regular lines of growth are quite distinct, 
white on the left side several broad longitudinal folds are somewhat obscurely 
visible. 
Part of the dorsum of another specimen showing the prominent dorsal ridge and 
the lines of growth curving backward to it. 
View of the aperture of asmall example retaining a portion of the inner lip. 
Clitambonites bed, Trenton group, Cannon Falls, Minnesota. 
JELLO OIDs CORN OV Ue)-0-< OPUS MnomaqoBencne sae ao0n so aacogo one Odeo so ononacnagassonoor 921 
(See also plate LXI1.) 
Two views of a large cast of the interior, imperfect at the aperture. Lorraine 
group, Covington, Kentucky. 
Lateral view of a smaller cast from the same locality. 
Transverse section of whorl of this and the following species. The sections are 
taken from casts of the interior, the inner line representing the ventral side of 
the whorl in B. mohri, the lower that of B. capax. As shown by the outlines, 
the surface descends into the umbilicus much more abruptly in the former than 
in the latter. 
BELUVEROPHON MOHIRDT (MgILGR: arorcicis cicjeuayeepere ate «)eto1eialelste[atetelyeleiele Pct repeals oieieieaveton eects 920 
Lateral view of a large cast, imperfect at the aperture. Richmond, Indiana. 
(Compare with figures 41 and 42, and refer to explanation of figure 43.) 
ss view of a testiferous example for comparison with figure 51 on plate 
KOKENTA ‘COSTALIS UWiSAMGiS nic cwicte ais cre's v=. spo 6ciar cjainjsinicisiolella slates eters fefale aietatetelalete im islarar= ars 882 
Lateral and dorsal views, the inner whorls restored, of the type of this genus and 
species. Clitambonites bed, Trento1 group, Cannon Falls, Minnesota. 
Transverse sections of the last whorl. The lower side of the figure is the dorsal. 
Portion of the broad dorsal band and of the right slope, x3. 
