I-IATI: IAXII. 



PAUK. 

 964 



Fig*. I to ' I.'iniii-ri i: v iiiiiMiv llallsp 



d Hhell of this species, fnnu tin- lowest member (SaSord's Central 



up, at Murfre-sboro, Teonosste. 



.f the last h..r; ,.f same, x2, showing the dirertlon and regularity of the 

 f growth. 



ist whorl of Mg I, x2. 



ist ..f the interior, <m which some of the external lines of growth are 

 sty preserve). St'.nes River group, Belolt, Wisconsin. 



'i of a ti elongated specimen. Stones River group, Dlxon, Illinois. 



Figs, 6 to 8 LI riiii-i-iu \ IT.I.II.H A I' .ami > 987 



ws of three specimens of this species. The general aspect Is preclse'y as In / 



ni tti.- lines of growth are constantly more oblique beneath the 

 peripheral angle and of a different character. Stones River and Trenton groups, 

 Mercer county, Kentucky. 



Fig. 9 LorROftpiRA PROCEKA I'lrlch 968 



w of the type of this species, the basal portion restored In outline. Stones 

 .IT group, Murfreesboro, Tennessee. 



Figs. 10 and II LOIMUWPIRA o,u AURISULCATA U. and S 987 



Opposite views of an excellent example of this species. , Richmond group. Spring 

 Valley, Minnesota. 



Figs. 12 to 16 LoriUMiMRA iirxiMN Ulrlch 966 



12 and 13 Opposite views of a rather small specimen. Trenton group, near Burgln, 



ntu.-ky. 

 M Same specimen. . -J. to show the lines of growth. 



15 Right tide of last whorl of flg. 12, x6. 



Figs. 16 to 19 LOPHOSPIRA CON< t s M i v I ' and S. 986 



16 A testiferous specimen from the Ctenodonta bed at St. Paul, Minnesota, showing 



the usual size and appearance. 



17 and 18 Opposite views of a smaller specimen from the same bed near Cannon Falls, Min- 

 nesota. 



19 Portion of last whorl of same x, showing the direction and regularity of the 

 lines of growth, the extremely fine revolving lines and the form and character 

 of the peripheral band 



Figs. 20 to 24 LnriiosriHA FILLMORBNSIH U. and S 967 



20 and 21 Opposite views of two casts of the Interior. Fuslsplra bed, Trenton group, 



koff. Minnesota. 



22 and 23 A testiferous specimen from the same horizon near Fountain, Minnesota, natural 

 size and a portion of the last whorl xi The latter shows the surface markings 

 whir it of rather coarse and distant lines of growth and a much finer 



Intermediate set. 



24 The last whorl of a cast from the WykofT locality, on which tin stronger set of 

 surface markings are rather distinctly reproduced. 



Figs. 26 to 28 LOPHOBPIKA HKMCTERKS var. WISCONSINKNSIS U. and S 971 



25 and 26 Two views of a cast of the Interior of medium size. The apcrlural portion is 

 perfect but the closely colled upper whorls are broken away. Stones River 

 group, Belolt, Wisconsin. 



27 A smaller cast from the same horizon at Minneapolis. Geological and Natural 



History Survey of Minnesota, Museum Register No. 6666. 



28 Small portion of the last whorl of another cast of tho interior, showing strong, 



even lines of growth. From the same horizon at Dlxon, Illinois. 



Film. 29 to 32 LoraOfiPiRA C'.M.MMSA U. and - 979 



19 A nearly complete cast of the int.-n..r. Stones River group, Minneapolis. 



30 Undi-r side of another cast front the same locality, showing the strong convexity 



v uniliT si, i,. ..- t)i>- whorls and a faint Indication of the ridge which 

 surround* Ih-- unitiillral cavitv mi tin- exterior of tin- sh-ll. 



31 Anoth' ^ .-itial of flg. 29 to show anterior outline of the outer Up. 



32 The body whor .-r ..ist from Minneapolis showing, besides obscure 



lines of growth, a faint ridge beneath the peripheral carlna. The latter Is 

 rarely seen on casts. 



