Figs. 33 to 
35 
Figs. 36 to 39 
36 and 37 
38 
39 
Figs. 40 to 43 
40 
41 and 42 
Figs. 44 to 
43 
47 
44 and 45 
Figs. 48 to 
46 
47 
50 
48 
49 
50 
Figs. 51 to 55 
Figs. 56 to 
59 
OPHOSPIRA (?)\ NOTABDGIS SWITCH ee porete)nesoeyete tere e:clers lereie > ofel oie otaele seat ete iets eee 
Three views of an almost perfect silicified shell of this remarkable species. 
Black River limestone of central Tennessee. 
LOPHOSPIRA TROPIDOPHORA Meek sp., instead of MULTIGRUMA Miller sp.*....... 
Opposite views of a large specimen showing the usual characters of the species. 
Lorraine group, Newport, Kentucky. : 
Portion of the last whorl of a smaller example on which the surface markings 
are better preserved, x2. Richmond group, Butler county, Ohio. 
A variety from the Richmond group at Madison, Indiana, in which the whorls 
descend more slowly, causing a wider apical angle. 
LOPHOSPIR A BOWDEN SaiOrd Spice ce «te cleestace ractele clea s cece eiaeie eieeicieteletcleteieletcleras 
A large specimen, imperfect at both ends, presenting the usual characters of 
the species. Richmond group, Boyle county, Kentucky. 
Two specimens, from the same locality, showing the extremes, respecting the 
relative hight of the spire, so far observed. 
Last whorl, with aperture slightly restored, of the original of fig. 41. 
LOPHOSPIRA SPIRONEMAJU.YaNG! [S:iaz ssc sas nn eres evn ciate at easte cleat eeteclerer ste iersleletes 
Opposite views of a specimen from the Ctenodonta bed of the Black River 
group, at Chatfield, Minnesota. 
Another specimen from the same bed near Cannon Falls, Minnesota. 
Portion of surface and outline of right side of last whorl of fig. 46, x10, showing 
the delicate cancellation of the surface and the angular form of the peripheral 
band. 
LOPHOSPIE A PEN UISTRDATAS (UilTiC Wii ssc<acchemoetlae secre nies Soe eee ei aeciee a aieereerae 
Nearly perfect example from the Utica group at Newport, Kentucky. 
The peripheral band of another specimen from the same locality, x10. The 
fine revolving lines which occur both above and beneath the band are not 
shown in the drawing. 
Small portion of the surface between the band and the lower angle, x10, 
showing the strong lamellar lines of growth, fine intermediate lines, and an 
unusual degree of irregularity in the direction of the spiral lines. The 
remarkable preservation of the more delicate markings on these specimens 
is due to the fact that they were protected by a thin parasitic bryozoan 
(Leptotrypa clavis Ulrich) which, on being removed, left them as distinct as 
during the life of the mollusk. 
LOPHOSPIRA SERRULATA (Salter :sp.y.c. «10s + eee eee CPE eee concer eee eciee 
(See also plate LXXIII, fig. 57.) 
An average cast of the interior. Stones River group, Beloit, Wisconsin. 
The empty mould of the exterior of a specimen of about the same size and 
character as that of which fig. 51 represents an internal cast. Leloit, 
Wisconsin. 
Gutta percha impression of a natural mould of the exterior of a shell having 
the whorls in contact through a longer period than usual. Shows the wavy 
peripheral plate very distinctly. Janesville, Wisconsin. 
A small cast of the interior from Minneapolis. The four or five other specimens 
of this species seen from the limestone at Minneapolis are all like this in 
size and cbaracter. 
The cast of the Jast whorl of an unusually large shell, figured so as to show 
the anteror outline of the outer lip. (Compare with fig. 26.) Janesville, 
Wisconsin. 
HOPHOSPIREA (7 SERLVA) HIRATA UITICH e mclscinictncueee a cmcieibiectsa cman etic cece ice 
A specimen with numerous spiral ridges on the basal part of the volutions. 
Utica group, Newport, Kentucky. 
Portion of the lower part, including the band, of the last whorl of same, x3. 
Part of the last whorl of a specimen of the form (var. obsoleta) having but a 
single spiral line beneath the peripheral band, x3. Also from Newport, 
Kentucky. 
Upper surface of whorl viewed from above, x3, showing interpolation of stria. 
978 
986 
983 
983 
968 
988 
*Since page 978 was printed we have come to the conclusion that this species is not distinct from Meek’s Pleuroto- 
maria tropidophora (Pal. Ohio, vol. 1, p. 154, pl. XIII, figs. 6a and 6D). 
corrected by changing the name to Lophospira tropidophora Meek sp. 
Our references to the shell should therefore be 
