Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
1 to 3 
land 3 
io.) 
9 and 10 
11 and 12 
13 to 15 
16 to 19 
16 to 18 
19 
20 to 23 
20 and 21 
22 and 23 
24 and 25 
26 to 29 
26 to 28 
29 
PLATE LXVI. 
BUCANTACHMMONST Wis am Gi Sir starjentnveis cteresaieis sesh lati see ate ere ee aio Site es erneteleteriarore 
Dorsal and lateral views of aspecimen from the ‘‘Central limestone” of the Stones 
River group at Murfreesboro, Tennessee, showing surface markings, the narrow, 
impressed slit-band, and peculiar indentations along the suture line. 
Apertural view of a specimen from the Black River group near Fountain, Minne- 
sota, Showing ribs on inner surface of ventral side of last whorl. In both of 
these specimens the slit portion of the last whorl (i. e., about half a turn) is 
broken away. 
BUC ANTASEUAT LiTe Wier DEON Sernrecatesrechne ot os sears eres aha cierti calcite tienen aie ie iasuuiabotrerteeteise 
Two views of a specimen retaining surface markings. About one-third of last 
whorl broken away. Stones River group, Cannon Falls, Minnesota. 
View of the umbilicus of a coarsely silicified shell, showing its nearly even slope. 
Black River group, Mercer county, Kentucky. s 
Transverse section of inner volutions of specimen represented by figures 4 and 5. 
Transverse section of a whorl of an internal cast from Mercer county, Kentucky. 
This specimen is somewhat doubtfully referred to this species, the back being 
unusually convex and the sides too blunt. 
ROGAN MankiTOR OMENS. Wa Bal Sesocncoce acon codapdeubdsad 6a0d onoSsEuasoondoondue 
Two views of the type of this species. Stones River group, Cannon Falls, Minne- 
sota. The specimen is a cast of the interior and slightly distorted, but pre- 
serves some of the surface markings and shows the peculiar impression of the 
umbilical slope. It is to be noted also that the perfect shell was considerably 
larger, a third volution at least being absent. 
RUCANTARHELTE TIO Aas Wi AMCs Stes ctr steelers sa isr ei ccts oeaaie pale orsetete vera otaisnseaiee abortions 
Two views of the cast regarded as the type of this species. Fusispira bed, Tren- 
ton group, near Cannon Falls, Minnesota. As usual with specimens of this 
genus, the slit portién of the last whorl is wanting. 
TSU C/ACN TPA GH U GEAUTDENGAN WMI] Glate Setscyes..cis says ance sists vere terlaiajela: a ocevtretercaeteararsi cet clevorniars ereraieteleie este 
Three views of a silicified shell, imperfect at the aperture. Upper part of Tren- 
ton group, near Burgin, Kentucky 
IBIAS HON ASAT BOA OG SEE oedaadsunce, ninobuBeone nee nbtd on bad Cando Co Otoron 
Three views of a small silicified specimen. The surface markings have been 
destroyed excepting for a short distance beneath the edge of the lower lip (see 
figure 18). Trenton group, near Burgin, Kentucky. 
Imperfect cast of the interior, probably ofthis species. Stones River group, Min- 
neapolis, Minnesota. 
SES CAUN UAC; S Urs AUN GTsTeAVTVAY Ul lity G vars syeyeraverers ehesexeicioerctereiste te eicieieis cists stove: « avatovele otetateestaveret sieloie 
An imperfect and somewhat macerated silicified example, showing the angular 
dorsum and part of the expanded apertural margin. Trenton group, near Bur- 
gin, Kentucky. 
A similar specimen from the same locality, showing the slit-band and surface 
markings. 
BUCANTAGLIND SIZE Valy SattOrdes per wetter sebetelaterstoreic iors -1arssvareicielslaielos iereiei sie s/o se ci eiaisereistere 
Two views of the original type of this species. Trenton group, DeKalb county, 
Tennessee. The specimen is partly coated by a parasitic bryozoan, as shown in 
Safford’s figures, but we thought it best to draw it without these disfiguring 
patches. 
BUCANDAS MICH OINIEMUAW DO ITICHy yefercrersveiateeicietetalere elnisveretaleveisteiaia nieista siclavsleletersia, eisieisiais  slcteite 
Three views o the silicified type, showing the unusually rapid expansion of the 
volutions ‘Trenton group, Danville, Kentucky. 
Part of dorsum of same x2, showing the delicate surface markings, the posterior 
end of the slit, and the slit-band. 
886 
887 
888 
890 
888 
891 
889 
892 
