404 The Ohio Journal of Science [Vol. XIX, No. 7, 



Plate XIX. 



Calymene niagarensis Hall. Profile of glabella and narrow anterior 



lip. Rochester shale; Lockport, New York. 



Calymene breviceps Raymond. Profile of glabella and narrow anterior 



lip; five lobes can be distinguished on each side of the glabella here 



figured. Waldron shale; Newsom, Tennessee. 



Calymene cf. vogdesi Foerste. Profile of glabella and broad flat anterior 



lip. In Holophragma zone in Lilley formation. Hillsboro, Ohio. 



Calymene celebra Raymond. Lip separated from anterior part of glabella 



by deep groove. Cedarville dolomite; Cedarville, Ohio. 



Calymene vogdesi Foerste. Broad lip separated from anterior part of 



glabella by a wide groove. Top of Brassfield formation, at Centerville, 



Ohio. Type specimen. 



Fig. 6. Proetus undulostriatiis (Hall). Sketch of type of Cyphaspis hndsonica 

 Rudemann (Bull. New York State Mus., 49, 1901, p. 64, pi. 4, fig. 8), 

 made by Dr. Ruedemann to indicate the present condition of the speci- 

 men. Snake Hill division of Trenton, on Green Island, near Albany, 

 New York. 



Fig. 7. Ceraurinus cf. trentonensis Barton. Part of cranidium. Kimmswick 

 limestone, Sanders Branch, Ralls count^^ Missouri. 



Fig. 8. Pterygometopiis achates (Billings). Glabellar portion of the specimen 

 figured by Clarke (Geol. Minnesota, .S, pt. 2, 1894, p. 727, fig. 44) as 

 Dalmanites achates Billings, from the Trenton at Trenton Falls, New 

 York. The glabellar furrows on the left side of this .specimen were 

 cleaned out and the enlarged drawing was prepared by Dr. Ruedemann. 



Fig. 9. Calymene whittakeri Foerste. A, cranidium; b, same enrolled specimen, 

 but placed so as to expose the pygidium, inverted. From the Colling- 

 wood formation, at Fields, half way between Collingwood and Meaford, 

 on south side of Georgian Bay. 



Fig. 10. Proetus cf. undid ostriatus (Hall). A, cranidium; B, lateral profile. 

 From the Strophomena vicina horizon, in the Trenton, northwest of 

 Bridgeport, Kentucky. 



Proetus parviusculus Hall. A, cephalon; B, lateral profile. From 

 Corryville member of Maysville formation, at Cincinnati, Ohio. 

 Proetus undulostriatiis (Hall). Sketch of original specimen identified 

 as Proetus undulostriatus by Dr. Ruedemann (Bull. New York State 

 Mus., 162, 1912, p. 117, fig. 3) from the Snake Hill member of the Trenton, 

 at Snake Hill, New York. 



Proetus princeps Savage. A, an attempted restoration of the cranidium 

 figured by Savage. B, pygidium referred to this species by Savage, in 

 his collection. From the Girardeau limestone, near Thebes, Illinois. 

 Proetus detcrminatus Foerste. A, B, cranidia; B, from the Savage col- 

 lection, but not a figured specimen. C, cephalon, showing traces of 

 glabellar furrows, but these traces are much accentuated in the figure. 

 D, pygidium. From the Edgewood limestone, at Thebes, Illinois. 



Fig. 15. Platycoryphe dubia (Savage). A, attempted restoration of cranidium 

 (type) figured by Savage. B, pygidium (type) figured by Savage. 

 {Calymene dubia Savage, Bull. Geol. Surv. Illinois, 23, 1913, p. 60, pi. 2, 

 figs. 8, 9). From the Girardeau limestone, in Alexander county, Illinois. 



Fig. 16. Platycoryphe platycephala Foerste. A, pygidium (type) seen from above; 

 B, obliquely lateral view of same. {= Calymene platycephala). From 

 the Saltillo member of the Trenton, at Clifton, Tennessee. 



Fig. 17. Pterygometopiis carleyi (Meek). Cephalon, from Fairmount member of 

 Maysville formation, at Cincinnati, Ohio. 



Fig. IS. Pterygometopus rogersensis Foerste. A, Cast of under side of cephalon 

 slightly restored; B, free cheek, with occular surface attached. A, 

 Dalmanites achates, five miles north of Rogers Gap, Kentucky, along the 

 railroad, (Jour. Cincinnati Soc. Nat. Hist. 21, 1914, pi. 1, fig. 18), from 

 Rogers Gap member of Cynthiana formation. B, from bridge 54, west of 

 Million tunnel. 



Fig. 19. Pterygometopus confluens Foerste. Cranidium. From Tyrone member 

 of Black River formation, at High Bridge, Kentucky. 



