PAGE. 

 Figs. 39 to 41 LIOSPIRA DECIPIENS Ulrich 998 



39 Upper side, showing slender volutions and distinct peripheral band; Murfreesboro, 



Tennessee. 



40 Lower side of same, with the apertural portions restored. The umbilicus is filled 



with shell-matter as in L. micula, L. progne and other species of the genus. 

 (See plates LXVIII and LXIX.) 



41 Profile of same, natural size; also outline of upper surface and periphery of last 



whorl, intended especially to show the band in transverse section. 



Figs. 42 to 14 LIOSPIRA MODESTA Ulrich 995 



Three views, x2, of a specimen from the Ctenodonta bed at Chatfleld, Minnesota. 

 Since page 995, on which this shell is referred to as possibly belonging to L. 

 abrupta, was printed, we have decided that it is sufficiently distinct to bear a 

 name of its own. We propose, therefore, to call it L. modesta. 



Fig. 45 MACLURINA MANITOBENSIS Whiteaves sp 1041 



Inner whorls on the flat side of a specimen from Olmsted county, Minnesota, x2. 



Fig. 46 MACLURINA CUNEATA Whitfleld sp 1042 



Vertical section of a very young example, magnified nearly two diameters, show- 

 ing that the inner whorls are widely umbilicated. The specimen is imbedded 

 in the rock filling the outer whorl of the specimen of M. manitobensis showing 

 the inner whorls as represented in fig. 45. 



Figs. 47 and 48 SUBULITES HEQULARIS U. and S 1072 



(See also plate LXXXI, flu. 35.) 



47 Ventral view of a young specimen; High Bridge, Kentucky. 



48 Side view of a large specimen, from the same locality. 



Figs. 49 to 54 STROPHOSTYLUS TEXTILIS U. and S 1064 



49 Cast of the interior from St. Paul, Minnesota, showing the usual form and several 



of the strong obliquely transverse furrows which occur so frequently, especially 

 on interior casts, in this species. 



50 A more depressed cast from Fillmore county, retaining traces of external markings. 



51 Ventral view of a testiferous example from the vicinity of Cannon Falls, 



Minnesota. 



52 Dorsal view of an incomplete shell from the same locality. The surface markings 



are beautifully preserved on this specimen. 



53 View of a specimen from Chatfleld, Minnesota, from which a part of the last 



whorl was removed so as to show the spirally twisted folds of the columella. 



54 Surface of last whorl of original of fig. 52, x5. 



Figs. 55 to 61 CYCLONEMA GBACILE Ulrich, and varieties 1062 



55 to 57 Three specimens of the typical form of this species, showing considerable differ- 

 ence in their respective apical angles, Newport, Kentucky. 



58 Ventral view of a specimen, from the same locality, referred to this species with 



some doubt. It may be an extreme form of C. sullceve (plate LXXVIII, figs. 48 

 and 49), but the upper whorls are. more convex than in any of the numerous 

 specimens of that species before us. 



59 Dorsal view of a rather small but perfect specimen of a form that, on account of 



the constant presence of delicate revolving lines, may be distinguished as var. 

 striatellum. It occurs with the other varieties at Cincinnati. 

 60 and 61 Two views of the apical whorls of same, x5. 



Figs. 62 to 64 

 62 and 63 



64 



Figs. 65 to 67 

 65 



66 and 67 



CYCLONEMA (?HOLOPEA) LIMATUM Ulrich 1063 



Opposite views of an excellently preserved example of this JJoZopea-like shell. 



The surface on portions of the specimen is polished, and here exhibits traces 



of revolving lines as shown in the figures. 

 Ventral view of a more ventricose individual. Both specimens were found in the 



vicinity of Cincinnati, Ohio. 



CYCLONEMA TRANSVERSUM Ulrich 1062 



Dorsal view of the strongly marked specimen regarded as the type of this species; 



Covtngton, Kentucky. The two upper whorls are restored in the figure. 

 Dorsal and basal views of a larger specimen which, while agreeing in probably all 

 essential respects with the preceding, has a smoother surface with faint indica- 

 tions of revolving lines on the periphery. 



