PLATE XXIII. 



PrOETI 8 DELPHINUH 8. 



Page ill. 



See Plate 25. 



Fie. 1. The cephalon, natural size, drawn from a cast of the internal surface. 



Fig. '-'. The same enlarged to three diameters, showing the short glabella and broad, concave bordei 

 The light side of the glabella has been somewhat restored in this drawing. 

 Upper Helderberg gi'oup. P I le, Provinee-of Ontarfa. 



Proetus folliceps. 



Page 101. 

 Fig. 3. An individual retaining the parts in juxtaposition, but preserving the crust in a fragmentary state. 

 The specimen shows the general proportions of the species, the convex glabella and the 

 glabellar furrows. 

 Fig. ■)■ Profile of the same, showing the convexity of the body. 



Comiferous limestone. Near LeRoy, Geneset county. 

 Fig. 5. A snmewhat fragmentary individual retaining the test. 



Comiferous limestone. Near LeRoy, Genesee county. 

 Fig. 6. A cephalon wanting tie- right cheek, shewing the furrows of the glabella. The drawing is made 

 from an internal cast in chert. 

 7. Outline pi-ofile of the same. 



(Vmiferous limestone. In the drift. Ann Arbor, Michigan. 

 Fig. 8. The pygidium represented in fig. :<. showing the peculiar markings on the internal cast of the 

 axis, noticed in the description of the species. An enlargement to two dja ters. 



Proetus tdmidt >. 



Page US. 

 Fig. 9. The intra-sutural portion of a cephalon, showing the tumid, rapidly tapering glabella and the 

 broad flat border. 



Upper Helderberg limestones. Port Colborne, Province of Ontario. 



Proetus canaliculatus. 



Page 107. 



See Plate 20. 

 Fig. 10. The dorsal surface of the movable cheeks, showing their form and the termination of the facial 



sutures at the anterior margin of the doublure. 

 Fig. II. The internal surface of the same, showing the doublure and its excavation at the bases of the 



cheek spines. 



Comiferous limestone. Falls of the Ohio. 



PROETIS ■ ?) PXANIMARGINATUS. 

 Page 112. 

 Fig. 12. A view of the type specimen. (Pal. Ohio, vol. i, pi. xxiii, fig. 3.) 

 Comiferous limestone. Sylvania, Lucas county, Ohio. 



Proetus Haldemani. 



Page 113. 

 See Plate 21. 



Fig. 18. An imperfect cephalon. retaining the cpust and showing the characteristic'glabellar furrows, but 

 having a strongly reflexed frontal border. Enlarged to two diameters. 

 Devonian limestones. Resent Hill. Eureka District. Nevada. 

 14. A pygidium of a large individual. 



Hamilton group. Long Lake, Michigan. 

 Fig. 15. The type specimen represented on plate 21, tigs. 7 and S, natural size. 



