Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
30 and 31 
30 
31 
32 to 35 
32 
33 to 35 
36 to 40 
36 to 38 
39 
40 
41 to 45 
41 
42 
43 
44 and 45 
-46 to 48 
46 and 47 
48 
49 to 51 
49 
50 
51 
52 to 54 
52 
53 and 54 
55 and 56 
57 
LOPHOSPIRA MEDIALIS var. BURGINENSIS UIrich «22... ..ccccccccccscsccsecceces seus 
An average example of this variety, x2, showing that it differs from the typical 
form, with which it is associated, in having a distinct lower carina. 
Represents a specimen that agrees very well with this variety excepting that it is 
much larger than the average and has a wider apical angle. Burgin, Kentucky. 
LOPHOSPIEA PERFORATA: W).; ANGUS semcreememcielate select eliets Cre eects ieee ae ene eee 
Cast of the interior, almost entire. The hight of the lower whorl is somewhat 
less than normal, because of pressure. Trenton group (Galena limestone), Jo 
Daviess county, Illinois. 
Three views of the last whorl of another cast from the same locality, with 
dimensions normal. A thin spiral line should have been drawn in the middle 
of the base of the body whorl in fig. 35. 
LOPHOSPIRA. ABNORMIS)Wilrithtecasnchecieletee erence cites eee eee Reet ee 
Two casts of the interior in lateral and basal views, the former showing the 
decided increase of the apical angle with the growth of the last whorl. Top of 
Trenton at Covington, Kentucky. 
Surface markings of last whorl of a testiferous example, magnified. 
Contour of right side of a whorl of same, magnified. 
LOPHOSPIRAs OWAENT AU se AD Gi Sse crass ainy-eeiniayei teks ammeter aan e eis ee oie eee eae eee 
Outline view of a specimen from the Glenadonta bed of the Black River group at 
Chatfield, Minnesota. 
The lower whorl of a specimen from the same horizon near Cannon Falls, Minne- 
sota, showing the ridge-like swelling about the minute umbilicus. 
A second specimen from this locality having an unusually strong swelling or 
ridge along the upper edge of the whorls. 
Opposite views of an average example. Near Cannon Falls, Minnesota. 
TLOPHOSPIRAVPULCHELE A, Umand Socc sr tccciel cease asele cn ee ee eee eee ae 
Two specimens, x2, showing the features which readily distinguish this pretty 
shell from L. medialis var. burginensis, with which it is commonly associated. 
Upper Trenton, Burgin, Kentucky. 
One of a number of specimens from the Richmond group at Spring Valley, Min- 
nesota, which we cannot distinguish from this species; x2. The angles are 
rounded through maceration. 
HO RHOSPIRAGSARRORDISUITICh Na.aaceaets -f es cate net aoae tcc nee e Ree Ree eReeEateee 
A specimen with half of the last whorl missing, yet showing all the essential 
characters of this fine species. Both the upper and lower angles are 
constantly developed, and therein lies the most obvious of the differences 
between L. saffordi and L. oweni. Trenton group, Davidson county, Tennessee. 
A more perfect and somewhat wider specimen from the same locality. 
A third example from the locality mentioned. 
LOPHOSPIVAPAREPD AM ULI Che: 27-1 soccer eee escent: sete eeer cee 
Apertural view of a large specimen that, excepting that its spire is unusually 
depressed, may be considered as fairly typical of the species. Richmond 
group, Boyle county, Kentucky. 
Opposite views of a rather large example of the lower variety. Lorraine group, 
Newport, Kentucky. 
LOPHOSPIRA PERDAMEL TOSSA: WMIMCH eek ee et ee camara cieecn cer acca eeiae eee 
A specimen of this species, natural size and x2, showing the strongly lamellose 
surface markings and the remarkably produced and twisted basal extremity. 
Richmond group, Butler county, Ohio. 
ILOPHOSPIRASERRULATAySalberespinc eee eesere ae ee See Eee RePEc eee riaee AEC eEEe CE 
(See also plate LX XII, figs. 51-55.) 
Fragment of a natural mould of the exterior, showing the lines of growth 
on somewhat less than half of the under side of the last whorl and an 
impression of the broad peripheral frill with its oblique plications, Stones 
River group, Dixon, Illinois. 
984 
974 
980 
982 
982 
981 
985 
