PAGE. 

 Figs. 30 and 31 LOPHOSPIRA MEDIALIS var. BURQINENSIS Dlrich : 974 



30 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. 



31 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. Burgiu, Kentucky. 



Figs. 32 to 35 LOPHOSPIRA PERFORATA U. and S 984 



32 Cast of the interior, almost entire. The bight of the lower whorl is somewhat 



less than normal, because of pressure. Trenton group (Galena limestone), Jo 

 Daviess county, Illinois. 



33 to 35 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. 



Figs. 36 to 40 LOPHOSPIRA ABNORMIS Ulrich 974 



36 to 38 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. 



39 Surface markings of last whorl of a testiferous example, magnified. 



40 Contour of right side of a whorl of same, magnified. 



Figs. 41 to 45 LOPHOSPIRA OWENI U. and S 980 



41 Outline view of a specimen from the Ctenodonta bed of the Black River group at 



Chatfleld, Minnesota. 



42 The lower whorl of a specimen from the same horizon near Cannon Falls, Minne- 



sota, showing the ridge-like swelling about the minute umbilicus. 



43 A second specimen from this locality having an unusually strong swelling or 



ridge along the upper edge of the whorls. 

 44 and 45 Opposite views of an average example. Near Cannon Falls, Minnesota. 



Figs. 46 to 48 LOPHOSPIRA PULCHELLA U. and S 982 



46 and 47 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. 



48 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. 



Figs. 49 to 51 LOPHOSPIRA SAFFORDI Ulrich 982 



49 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. 



50 A more perfect and somewhat wider specimen from the same locality. 



51 A third example from the locality mentioned. 



Figs. 52 to 54 LOPHOSPIHA AMPL A Ulrich 981 



52 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. 



53 and 54 Opposite views of a rather large example of the lower variety. Lorraine group, 

 Newport, Kentucky. 



Figs. 55 and 56 LOPHOSPIRA PERLAMELLOSA Ulrich 985 



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. 



Fig. 57 LOPHOSPIRA SERRULATA Salter sp 968 



(See also plate LXXII, flits. 51-.W.) 



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. 



