Fig. 1 
Figs. 2 to 4 
2and 3 
Figs. 8 to 10 
8 
{) 
10 
Figs. 11 to 16 
1land 12 
13 
14 
16 
Figs 17 and 18 
17 
18 
Figs. 19 to 21 
19 
20 and 21 
PLATE LXXX. 
WUSISPIRA“SCHUCHERTIL Usandl IS ncmnicetleeeieclele crcfeielerere reste ae ree eee ee 
View of the type and only known specimen of this species. Part of the shell 
is preserved. Its great thickness is the most important of the peculiarities 
of the species. Black River group, Beloit, Wisconsin. Geological and Natural 
History Survey of Minnesota, Museum Register No. 7322. 
HUSISPIRA: NOBILIS (Ua CIS y-)-fercst telchie oslo ieeeee ine onary ayers en ae ee 
Opposite views of a sharply defined but incomplete and small cast of the 
interior, showing, besides the usual characters of the species, seven obscure 
revolving lines on two of the whorls. Trenton group, Fusispira bed, Wykoff, 
Minnesota. 
A larger specimen from the same locality. This slightly exceeds in size the 
average for the species. The whole surface is covered with a thin layer of 
crystalline calcite and exhibits not a trace of revolving bands. 
FNUSISPIRAS (SUM OAMIA™ UMUC Heo verertrere is cseveiemaatatelstal ele istere eesti ayeleto lee ciara 
Dorsal view of a specimen that, excepting the patch of shell shown, is a 
sharply defined cast of the interior. The shell is rather thick, and, as shown 
in the figure, the external suture line is situated considerably higher than 
it is in the cast. The latter shows, especially on the upper whorls, rather 
distinct revolving sulci. Base of Utica or top of Trenton, Scott county, 
Kentucky. 
Apertura] view of same. 
Small portion of the surface of tke shell x10, showing puncte of two sizes 
arranged in series parallel with the suture line. 
INTSISPIRAY CON VERA. NU) andi coc cecnsaesieteres malo sterelensie i istilalars seine Clemo eieiaere 
Dorsal view of an incomplete but clean cast of the interior, from the Trenton 
limestone at Trenton Falls, New York. Has obscure revolving bands like 
the preceding species but differs in its more convex and more depressed 
whorls. 
The last two whorls of a larger cast, apparently of this species. 
bed of the Trenton group, Goodhue county, Minnesota. 
Outline of the lower and outer parts of the lip of same as seen from beneath. 
Clitambonites 
MUSISPIRACSUBBRE VIS: WU). HIN SSx.reccre as ic Siler siete ou jailer shove eretertareveneye ote aretetehe oieistemeterate rete 
Opposite views of a small cast of the interior, Fusispira bed, Goodhue county, 
Minnesota. 
Apertural view of a much larger cast. This specimen has the mouth entire 
but has suffered some from pressure and may not really belong to this species. 
Maclurea bed of the Trenton group, Stewartsville, Minnesota. Geological 
and Natural History Survey of Minnesota, Museum Register No. 8728. 
Dorsal view of lower two whorls of same. 
Dorsal view of a specimen from the Fuasispira bed at Decorah, Iowa. This 
agrees, so far as we can see, exactly with the original of fig. 11. Geological 
and Natural History Survey of Minnesota, Museum Register No. 7362. 
Outline, as seen from below, of lower and outer portions of the lip of the 
specimen represented by figs. 13 and 14. 
FUSISPIRA) INFDATAMeekcand) SWOLGHEMS x. clerraetaretatarotarsiatsioteloteic cletaresey tetetetieunieretiersietete . 
Apertural view of a cast of the interior of a young specimen. Lower part of 
Fusispira bed, Kenyon, Minnesota. 
Apertural view of a large and nearly perfect cast of the interior, showing the 
adult appearance of the species. Fusispira bed, Goodhue county, (Hader 
P. O.), Minnesota. In the variety which occurs in the Maclurea bed the 
under side of the whorls is more ventricose, causing the bend in the inner 
outline of the aperture to be more abrupt. 
USISPUR A UNTER MR AO Wee cena ns craterers torte ons la ier eleven ake eve teitsrarevatais ovale vaiaretcwetste fete (siete iat mainte 
Dorsal view of a specimen showing the slender spire and relatively rapid 
expansion of the last whorl. Maclurea bed, Stewartsville, Minnesota. Geolog- 
ical and Natural History Survey of Minnesota, Museum No. 7451. 
Opposite views of another specimen from this locality, showing, as far as it goes, 
the same features. 
1078 
1077 
1077 
1076 
1075 
1076 
