PLATE LIII 



PAGE 



Fig. 1. CLIMACOGRAPTUS BICORNIS (Hall) 204 



Typical specimen showing sicular extremity. 



Ordovician (Crazyan), Normanskill shale, Kenwood, New 

 York. 



Figs. 2-4. DIPLOGRAPTUS VESPERTINUS Ruedemann 205 



2. Early form of the species. X 5. 



3. Late type. X 5. 



4. Enlargement of a larger specimen. X 5. 



Ordovician (Chazyan), Normanskill shale, Van Schaick 

 Island, New York. 



Fig. 5. MEROCRINUS sp 211 



Several segments. X 4. 



Ordovician (Cincinnatian), Eden portion of Martinsburg 

 shale, one and one-half miles northeast of Fort London, Pennsyl- 

 vania. 



Figs. 6, 7. HETEROCRINUS HETERODACTYLUS Hall 210 



6. An example preserving the body and a part of the column. 



7. Portion of the same enlarged. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 



Fig. 8. HUDSONASTER CLARKi Bassler, n. sp 211 



Photograph of a gutta-percha squeeze of the two type specimens pre- 

 served as a mold in sandy shale. X 4. 



Ordovician (Cincinnatian), Eden portion of the Martinsburg 

 shale, one and one-half miles northeast of Fort Loudon, Pennsyl- 

 vania. 



Fig. 9. BERENICEA VESICULOSA Ulrich 214 



Surface of the type specimen. X 18. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 



Fig. 10. HALLOPORA OXEALLI SIGILLARIOIDES (Nicholson) 222 



A fragment of sandstone with several molds of this abundant species. 

 Ordovician (Cincinnatian), Eden portion of the Martinsburg 

 shale, one and one-half miles northeast of Fort Loudon, Pennsyl- 

 vania. 



Figs. 11-13. BYTHOPORA ARCTIPORA (Nicholson) 221 



11, 12. Fragment of the cylindrical zoarium, natural size and a portion 

 enlarged. 



13. Several zooecia much enlarged. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 



Figs. 14, 15. ARTHROPORA CLEAVELAXDI (James) 225 



14. Three segments. X 4. 



15. Portion of a segment. X 18. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 

 Figs. 1-4 are after Ruedemann; 6, 7, after Meek; and 11-15 

 after Nicholson. 



403 



