PLATE LXIII. 



Figs. 1 to 14 

 1 and 2 



4 to 6 

 7 and 8 



9 



10 



11 



12 



13 and 14 



Figs. 15 to 20 

 15 



16 and 18 



17 

 19 

 20 



Figs. 21 to 27 

 21 



22, 24 and 25 



23 

 26 and 27 



Figs. 28 to 30 

 28 



29 and 30 



Figs. 31 to 35 

 31 and 32 



33 

 34 



35 

 Figs. 36 to 39 



Figs. 40 to 44 

 40 to 43 



44 



Figs. 45 to 47 

 45 and 46 



47 

 Figs. 48 and 49 



Figs. 50 and 51 

 50 



U 



PAGE. 



PROTOWARTHIA CANCELLATA Hall sp 872 



Two views of a large cast of the interior, retaining a little of the shell in the 

 umbilicus and having several strong wrinkles of growth near the aperture. 

 Ctenodonta bed of the Black River group, West St. Paul, Minnesota. 

 Apertural view of a shell having the mouth less expanded than usual. Ctenodonta 



bed, Goodhue county, Minnesota. 

 Three views of an entire shell, representing an average for the species in size and 



proportions. Ctenodonta bed, Chatfleld, Minnesota. 



Two views of a rather small cast of the interior from the Clitarubonites bed of 

 the Trenton group in Goodhue county. This is a fair sample of the species as 

 it occurs in this bed. 



Surface of a specimen from the Utica group at Covington, Kentucky. x*.5 and x9. 

 In certain lights the longitudinal lines look more like a series of minute gran- 

 ules. The right side of the figure corresponds very nearly with the center of 

 the cinus. These fine markings are but rarely preserved on Minnesota speci- 

 mens. 

 Outline, in a dorso-lateral view, of left lobe of outer lip of an average example of 



the species from Covington, Kentucky. 



Outline of sinus, lobes and dorsum of same, viewed from above. 

 Outline of same specimen in a view from below. 



Surface of left lobe of outer lip, x4.5, and a dorsal view of a more globose and 

 more delicately marked variety, occurring in the Dtica group at Covington, 

 Kentucky. 



PROTOWARTHIA RKCTANGULARIS U. and S 868 



Lateral view of a very large specimen a partial cast of the interior from the 



Stones River group, at Mineral Point, Wisconsin. 

 Lateral and basal views of a cast having the central part of the back unusually 



prominent and marked with wrinkles of growth. Beloit, Wisconsin. 

 Dorsal view of an average cast of the interior. Beloit, Wisconsin. 

 Outline of right lobe of outer lip of same. 

 Outline of sinus, lobes and dorsum of same viewed from above. 



PROTOWARTHIA PERVOLUTA U. and S 87 1 



Basal view of an incomplete shell showing the granulose expansion which spreads 

 from the aperture over the sides and back of the lower part of the shell. Black 

 River group (Ctenodonta bed), St. Paul, Minnesota. 



Apertural and lateral views of a small but well preserved shell of the natural 

 size, and the lateral view *2, showing the granulose layer spreading over the 

 basal or inner half of the last whorl and the grano-lineate extensions curving 

 around the umbilical callosity. Black River group, Chatfleld, Minnesota. 

 Transverse section of the outer whorl of a cast. 



Two views of an unusually large cast of the interior from the Black River group 

 of Mercer county, Kentucky. 



PROTOWARTHIA GRANISTRIATA Ulrich 870 



Dorsal view of an average example of this species. Utica group, Covington, Ken- 

 tucky. 



Apertural and lateral views of another specimen, from the same locality, showing 

 the form of the mouth and the extent of the grano-striate expansion. 



PROTOWARTHIA PLANODORSATA Ulrich 87 1 



Dorsal and lateral views of a specimen that has evidently suffered slightly from 



lateral compression. 



Outline of same in a basal view. Utica group, Covington, Kentucky. 

 Dorsal view of another example, from the same locality, showing normal propor- 

 tions. 



Outline, as seen in a basal view, of another specimen from Covington, agreeing in 

 all respects with other specimens of this species except that it is too wide. 



PROTOWARTHIA CONCINNA U. and S 874 



Four views of the type of this species. Richmond group, Spring Valley, Minn- 

 esota. 



PROTOWARTHIA SUBCOMPRESSA Ulrich 873 



Four views of the best specimen seen. It, preserves the two inner layers of shell 

 only and these even are absent in the upper part of the dorsum where the 

 Internal cast is exposed. Richmond group, Versailles, Indiana. 

 Part of the surface of a smaller specimen showing the great width of the sinus 

 and the relative narrowness of the lateral lobes. Butler county, Ohio. 



PROTOWARTHIA OBESA Ulrich 874 



Dorsal and lateral views of a good but rather small cast of the interior, showing 

 a strong terminal constriction and several of minor depth farther down. Lower 

 part of Trenton group, Danville, Kentucky. 



View from above of another specimen showing one of the constrictions and lines 

 of growth beyond it. Mercer county, Kentucky. 



BUCANIA SIML'LATRIX Ulrich 892 



(Bee also plate i.xvu.) 



Dorsal and upper views of a good cast of the interior, showing, among other fea- 

 tures of the species, the deep sinus and long slit. Richmond group, Richmond, 

 Indiana. 



BELLEROPHON CAPAX Ulrich 



(See a!- plate I.M v.) 



A specimen preserved In soft shale, from the upper part of the UMca group at Cin- 

 cinnati, Ohio. The hight of this specimen has been considerably reduced by 

 pressure, but it serves very well in showing the expansion of the aperture, the 

 sinus and the surface markings. 



Apertural view of a specimen from the Lorraine group at Covington, Kentucky, 

 that is largely covered by an incrusting bryozoan. The outline and thickness 

 of the latter is indicated by the irregular line about the lower part of the figure. 



921 



