30 

 31 



32 



PAGE. 



Figs. 24 and 25 CYRTOSPIRA TORTILIS Ulrlch 1074 



Opposite views of a silicifled shell of this species. Lower division of the Stones 

 River group, Murfreesboro, Tennessee. 



Figs. 26 and 27 FUSISPIRA PLANULATA U. and S 1078 



Opposite views of the type of this species. The specimen is an excellent cast of 

 the interior from the Fusispira bed of the Trenton at Eagle Point, Iowa. 



Figs. 28 to 31 FUSISPIRA ANGUSTA U. and S 1079 



28 Apertural view of the lower whorls of a large specimen. It is a cast of the 



interior, but as the shell was not very thick, it gives a good idea of the external 

 form ofthe volutions and mouth. Clitambonites bed, Cannon Falls, Minnesota. 



29 Dorsal view of a more complete cast, from the same locality, showing the compar- 



atively great night of the volutions 



A third cast having somewhat deeper sutures than usual. Cannon Falls, Minnesota. 

 Somewhat loosely coiled cast of the interior, from the same bed and locality. 



Fig. 32 FUSISPIRA ANGUSTA var. SUBPLANA U. and S 1079 



Ventral view of one of the two specimens upon which this variety is founded. 

 Clitambonites bed, near Cannon Falls, Minnesota. 



Figs.33,34,36,37 SUBULITES, sp. undet 1073 



33 Testiferous fragment with banded suture line. Black River group (Ctenodonta 



bed), Chatfleld, Minnesota. 



34 Apical portion of a shell, preserved partly as a cast of the interior. Stones River 



group, High Bridge, Kentucky. 



36 An imperfect, macerated shell from High Bridge, Kentucky. 



37 Interior cast of the spire showing that the apical whorls are not filled with solid 



material as in the more typical species of Subulites. Stones River group, Beloit, 

 Wisconsin. 

 Fig. 35 SUBULITES REGULARIS Ulriet 1072 



(See also plate LXXXII, flgs. 47 and 48.) 



36 Interior cast of the last volution, showing the long and remarkably slender canal. 

 High Bridge, Kentucky. 



Figs. 38 and 39 FUSISPIRA SUBFUSIFOKMIS Hall 1077 



Opposite views of an incomplete cast of the interior, showing the convex whorls 

 and rather wide mouth which are characteristic of this species. Fusispira bed, 

 Goodhue county, Minnesota. 



Figs. 40 and 41 MEEKOSPIRA SUBCONICA U. and S 



Two views of the type of this species. Richmond group, near Spring Valley, Min- 

 nesota. 



