PLATE LXIX. 



PAGE. 

 Figs, land 2 LIOSPIRA ANGUSTATA U. and S 997 



(See also plate LXVIII.) 



1 Vertical section of a large specimen, chiefly a cast of the interior, showing 



thickness of shell in the umbilicus. The sutures in this specimen are unusually 

 deep. Trenton group, Wykoff , Minnesota. 



2 Under side of the specimen figured on plate LXVIII (figures 35 and 36), showing 



the narrow umbili.al perforation and thick shell surrounding it. Though 

 the rest of this side of the specimen is a cast of the interior, the outer part 

 of the last volution still gives a good idea of the surface markings. 



Figs. 3 to 8 LIOSPIRA VITRUVIA Billings sp 9<i.-, 



3 to 5 Three views of a cast of the interior, from the Stones River group at Beloit. 

 Wisconsin. The concavity of the upper side of the outer volution is usually 

 somewhat less, while the hig'ht of the casts is commonly a trifle greater 

 among Minnesota specimens of this species. 



6 Vertical section of the cuter whorl of another specimen from Wisconsin, agreeing 

 with the preceding and showing the outline generally pertaining to Wisconsin 

 representatives of the species. Geological and Natural History Survey of 

 Minnesota, Museum Register No. 7287. 



and 8 Vertical sections of two specimens from the Vanuxemia bed of the Stones 

 River group of Minnesota, the first from Minneapolis, the second from Cannon 

 Falls. Both retain the shell in the umbilicus and show, one more distinctly 

 than the other, the angular border of the large umbilical perforation which is 

 characteristic of the species. 



Fitfs. 9 to 14 EOTOMARIA CANALIFERA Ulrich 1002 



9 to 12 Four views of an average example of this species. Lowest division of the Stones 

 River group, Murfreesboro, Tennessee. 



13 Surface markings of the upper side and contour of same portion, x2, of a largo 



specimen from the same locality. The upper slope of the contour line is a little 

 too steep in the figure. 



14 Outline view of a third specimen; the aperture is broken away but the spire is 



almost complete and shows the gradual increase of the apical angle. 



FigS. 15 to 17 EOTOMAUIA L.ABIOSA UlHch 1003 



Three views of a nearly entire silicifled shell, showing the great strength of the 

 inner lip which distinguishes the species from E. canalifera. Stones River 

 group, Murfree'iboro, Tennessee. 



Figs. 18 to 20 EOTOMAKIA VICINUS U. and S 1003 



18 Dorsal view of a cast of the interior from the Stones River group at Minneapolis. 

 Minnesota. Geological and Natural History Survey of Minnesota, Museum 

 Register No. 5106. 



19 and 20 Apertural and basal views of a smaller and relatively higher cast from the same 

 horizon at Mineral Point, Wisconsin. The species is c osely related to E. dryopc 

 Billings sp., but has a more evenly conical spire. 

 Figs. 21 to 25 EOTOMAKI A DRY/OPE Billings sp 1003 



21 Dorsal view of a large shell of this species from the Black River group of central 



Tennessee. Prof. J. M. Safford's collection. 



22 Section of a whorl taken from a smaller specimen collected at the same locality 



as the preceding. 



23 to 25 Three views of a good cast of the interior, the spire slightly lower than usual for 

 the species. Stones River group, Cannon Falls, Minnesota. 



. 26 to 29 EOTOMAKIA STJPRACINGULATA Billings sp 1004 



26 Gutta percha impression from an incomplete natural mold of the exterior. Stones 



River group, Beloit, Wisconsin. 



27 to 29 Three views of a large specimen from Dixon, Illinois, retaining the shell, in a 

 macerated condition, however. Figure 29 shows the remarkable forward sweep 

 of the outer part of the under lip. 



. 30 to 32 LIOSPIRA SUBCONCAVA Ulrich 999 



30 and 31 Two views of an average example. Stones River group, Murfreesboro, Tennessee. 

 32 The upper side of a large specimen, from the same locality, showing the fine sur- 

 face markings. The lattei are more delicate than they appear in the figure. 



. 33 to 36 LIOSPIRA(?) RUGATA Ulrich 999 



Four views of an average example of this species. The shell has suffered from 

 maceration yet preserves distinct remains of the transverse wrinkles. Rich- 

 mond group, McKinneys, Kentucky. 



Figs. 37 to 41 LIOSPIHA (?) MUNDULA Ulrich '..:> 



37 and 39 Two views of a specimen, medium in size and proportions. As usual the surface 

 markings are very obscure. Upper part of Trenton group, Danville, Kentucky. 

 Upper side of a similar specimen. 



40 and 41 Two views of a large shell, imperfect at the mouth but preserving unusually dis- 

 tinct lines of growth. Formation and locality same as preceding. 



F IT-. 42 to 46 LIOSPIRA (? > ANGUL ATA Ulrich 1000 



42 and 43 Lower and upper sides of a silicitted shell, showing the angular border of the 

 umbilicus. Black River group, Mercer county, Kentucky. 

 Umbilical side of a cast of the interior from the same locality. 



45 A large cast of the interior, the inner whorls restored from another specimen. 



Locality same as preceding. 



46 Apertural view of original of figures 42 and 43. 



Figs. 47 to 50 OLATHROSPIRA suiicoNicA Hall sp 1006 



(See also plate i.xx.) 



47 and 48 Two views of a cast of the interior from the Stones River group at Beloit, Wis- 

 consin, showing an unusual feature in the large pits in the peripheral band. 



49 Another cast from Beloit with unusually strong ribs on the upper slope of the last 



volution. 



50 Cast of the interior of a large and typical shell from the Vanuxemia bed at 



Minneapolis. Geological and Natural History Survey of Minnesota, Museum 

 Register No. 6037. 



Fi*. 51 CLATIIUOSIMKA CON VEXA U. and S 1007 



Dorsal view of a specimen from the Stones River group in Calhoun county, 

 Illinois. The upper slope of the whorls is more convex than in C. suliconicn. 



