May, 1919] Silurian Fossils From Ohio 403 



Plate XVII. 



Fig. 1. Atrypa reticularis hillshoroensis Foerste. A, pedicel valve; B, brachial 

 valve; C, anterior view, with pedicel valve dn top; D, brachial valve 

 from another specimen. From Holophragma zone in Lilley member, 

 in Zink quarry, in eastern part of Hillsboro, Ohio. 



Pig. 2. Platyceras angulatum (Hall). A, B, two views of the same specimen; at 

 the tip of the complete specimen the volutions are in contact, but in the 

 cast of the interior here figured this apical part is not preserved. The 

 apical part separated from the cast and remained on another fragment 

 of the containing rock. From the Cedarville dolomite, at Cedarville, 

 Ohio. 



Fig. 3. Rhynchotreta americana Hall. Brachial side. From the upper part of 

 the West Union formation, south of Carrs station, in Lewis county, 

 Kentucky. 



Fig. 4. Camarotocchia indianensis (Hall). A, lateral view; B, pedicel valve; 

 C, brachial valve. From the Holophragma zone in the Lilley member, 

 at Zink quarry, in eastern Hillsboro, Ohio. 



Fig. 5. Camarotoechia cf. neglecta (Hall). A, lateral view; B, pedicel valve; 

 C, brachial valve. From Holophragma zone, in Zink cjuarry, in the 

 eastern part of HilLsboro, Ohio. 



Fig. 6. Dinobohis conradi (Hall). Pedicel valve, cast of interior. From Cedar- 

 ville dolomite, at Mills quarry, southwest of Springfield, Ohio. 



Fig. 7. TrocJwncma fatuuni (Hall). A, natural size; B, enlarged. From the 

 Holophragma zone, at Zink quarry,, in eastern Hillsboro, Ohio. 



Fig. 8. Poletimitn prosseri Foerste. A, lateral view; B, apical view; C, umbilical 

 side. From Holophragma zone, in Zink cjuarrv. in eastern Hillsboro, 

 Ohio. 



Fig. 9. Poleumita paveyi Foerste. A, lateral view of partially deformed speci- 

 men; B, apical view, oblicjue; C, umbilical view, partially distorted. 

 From Holophragma zone, in Zink quarry, in eastern part of Hillsboro, 

 Ohio. 



Fig. 10. Diaphorostomn Jiillsboroensis Foerste. A, lateral view, showing aperture; 

 B, lateral view, from opposite side, of a second specimen; C, basal view, 

 showing aperture; D, apical view. From Holophragma zone, in Zink 

 quarry, in eastern part of Hillsboro, Ohio. 



Pl.^te XVIII. 



Slropheodonla (Brachyprion) newsomensis Foerste. A, interior of pedicel 

 valve; B, C, interiors of brachial valves. From Holophragma zone in 

 Lilley member, in Zink quarry, in eastern Hillsboro, Ohio. 

 Encrimirus cf. ornatus Hall and Whitfield. A, pygidium; B, oblicjuely 

 lateral view of same; C, part of cephalon. From Holophragma zone at 

 Zink quarry, in eastern Hillsboro, Ohio. 



Phacops (Portlockia) mancus Foerste. Cephalon. From Cedarville 

 dolomite in eastern Mills cjuarry, .southwest of Springfield, Ohio. 

 Dalmanites hrevigladiolus Foerste. A, B, C, fragments of pygidia; D, E, 

 fragments of cranidia. From Holophragma zone, at Zink riuarry, in 

 eastern part of Hillsboro, Ohio. 



Dalmanites cf. verrucosus Hall. Cast of lower side of cephalon. From 

 Cedarville dolomite, at Cedarville, Ohio. 



Calymene cf. vogdesi Foerste. Cranidium; see also Fig. 3 on Plate XIX. 

 From Holophragma zone, at Zink cjuarry, in eastern part of Hillsboro, 

 Ohio. 

 Fig. 7. Proetiis collinodosus Foerste. A, cranidium; B, pygidium. From Holo- 

 phragma zone, at Zink quarry, in eastern part of Hillsboro, Ohio. 



