294 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 44 



PAGE 



Dicellocephalus hartti (Walcott) 273 



Figs, i and la. (Natural size.) Dorsal and side views of a large, 

 imperfect cranidium. U. S. National Museum, Catalogue 

 No. 58571. 



2. (Natural size.) Free cheek. U. S. National Museum, Catalogue 

 No. 58572. 



3 and 3a. (Natural size.) Dorsal and side views of a smaller 

 cranidium than that illustrated by fig. 2. U. S. National 

 Museum, Catalogue No. 58573. 



4. (Natural size.) Hypostoma with outline restored. U. S. 



National Museum, Catalogue No. 58574. 



5. (Natural size.) Portion of thoracic segment. U. S. National 



Museum, Catalogue No. 5S575. 



6 and 6a. (Natural size.) Dorsal and side views of a large 



pygidium, illustrating the increase in width of the border 

 as compared with the specimen represented by fig. 7. U. S. 

 National Museum, Catalogue No. 58576. 



7 and 7a. (Natural size.) Dorsal and side views of a smaller 



pygidium. U. S. National Museum, Catalogue No. 58577. 



Dicellocephalus tribulis Walcott 274 



Figs. 8 and 8a. (X2.) Dorsal and side views of the type specimen 

 of cranidium. U. S. National Museum, Catalogue No. 58578- 



The specimens represented by figs. i-8a are from locality (76), 

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

 west of Saratoga Springs, Saratoga County, New York. 



Conocephalina whitehallensis Walcott 269 



Figs. 9 and 9a. (X 2.) Dorsal and side views of the type specimen of 

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

 58579- 

 10. (X3-) Free cheek associated with the specimen represented 

 by fig. 8. U. S. National Museum, Catalogue No. 58580. 



II and iia. (X 2.) Dorsal and side views of an associated 

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

 Catalogue No. 58581. 



The specimens represented by figs. 9-1 la are from locality (iioa) 

 (just above 110), Upper Cambrian, sandstone on the east side of the 

 town of Whitehall, Washington County, New York. 



