NO. 9 NEW YORK POTSDAM-HOYT FAUNA 293 



DESCRIPTION OF PLATE 43 (Continued) page 



Agraulos saratogensis Walcott 269 



Figs, ii and iia. (Natural size.) Dorsal and side views of an imperfect 

 cranidium. U. S. National Museum, Catalogue No. 58558. 

 12. (Natural size.) A large free cheek associated with this species. 

 U. S. National Museum, Catalogue No. 58559. 



13 and 13a. (X 2.) Dorsal and side views of associated pygidium. 



U. S. National Museum, Catalogue No. 58560. 



14 and 14a. (X2.) Dorsal and side views of a nearly entire 



cranidium. U. S. National Museum, Catalogue No. 58561. 



15 and 15a. (X 3-) Ventral and side views of an hypostoma asso- 



ciated with this species. U. S. National IVIuseum, Cata- 

 logue No. 58562. 



Ptychaspis speciosus Walcott : 272 



Figs. 16 and i6a. (Natural size.) Dorsal and side views of an imper- 

 fect cranidium. U. S. National Aluseum, Catalogue No. 

 58563. 



17. (X 2.) Associated free cheek referred to this species. U. S. 

 National Museum, Catalogue No. 58564. 



18 and i8a. (X 2.) Dorsal and side views of associated pygidium 

 referred to this species. U. S. National Museum, Catalogue 

 No. 58565. 



19. (X4.) Enlargement of the central portions of the cranidium 



of the specimen represented by fig. 16, showing the coarse 



tubercles on the glabella and fine tubercles on the anterior 



margin. U. S. National Museum, Catalogue No. 58563. 



The specimens represented by figs. 7-19 are from locality (76), 



Upper Cambrian. Hoyt limestone, Hoyts quarry, 4 miles (6.4 km.) 



west of Saratoga Springs, Saratoga County, New York. 



Ptyclioparia Jiiimita (Bradley) ■. 267 



Figs. 20 and 20a. (X 3.) Dorsal and side views of a convex cranidium. 



U. S. National Museum, Catalogue No. 58566. 

 21. (X3.) Associated free cheek. U. S. National Museum, 



Catalogue No. 5S567. 

 22 and 22a. (X3.) Dorsal and side views of a cranidium pre- 

 serving the anterior rim and border. U. S. National 



Museum, Catalogue No. 58568. 

 2^ and 23a. (X3.) Dorsal and side views of a pygidium from 



which the test has been exfoliated. U. S. National Museum, 



Catalogue No. 58569. 

 24. (X 3-) Dorsal view of a pygidium preserving the test. U. S. 



National Museum, Catalogue No. 58570. 

 The specimens represented by figs. 20-24 ^''^ from locality (77), 

 Upper Cambrian, Potsdam horizon, sandstone near the water below 

 the falls at the high bridge, and also at several horizons in the 

 section, the highest point being 70-75 feet (21.3-22.9 m.) above 

 the water in Ausable Chasm, Essex County, New York. 



