292 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 43 



PAGE 



Palaacmaa typica Hall and Whitfield 264 



Fig. I. (Natural size.) View of the upper side of a large specimen. 



2. Profile view, showing the convex side and curvature of the shell 

 represented by fig. i. 



These figures are reproduced from illustrations by Hall and 

 Whitfield (Twenty-third Ann. Rept. New York State Cab. Nat. 

 Hist., 1873, pi. II, figs. 4 and 5). The specimens represented by 

 figs. I and 2 are from the Potsdam sandstone, Keeseville, New York. 



Hyolithcllus papillatus Walcott 267 



Fig. 3. (Natural size.) Portion of a rather large tube. U. S. National 

 Museum, Catalogue No. 58553. 



4. (X4-) Enlargement of a portion of the specimen illustrated 

 by fig. 3, to illustrate the surface characters. 



The specimens represented by figs. 3 and 4 are from locality (iii). 

 Upper Cambrian, at the top of the Potsdam sandstone on Marble 

 River, one mile (1.6 km.) south of Chateaugay, Franklin County, 

 New York. 



Hyolithes gibbosus Hall and Whitfield 265 



Fig. 5. (Natural size.) View of the ventral, rounded side, showing the 

 form of the shell. 

 6. (Natural size.) Profile view, showing the convex side and cur- 

 vature of the shell. 



These figures are reproduced from illustrations' by Hall and Whit- 

 field (Twenty-third Ann. Rept. New York State Cab. Nat. Hist., 

 ^^73, pl- II' figs. I and 2). The specimens represented by figs. 5 and 

 6 are from the Potsdam sandstone, Keeseville, New York. 



Lonchocephalus calciferus (Walcott) 270 



Figs. 7 and 7a. (Natural size.) Dorsal and side views of an imperfect 

 cranidium. U. S. National Museum, Catalogue No. 58554. 



8. (Natural size.) Dorsal view of a cranidium, showing the char- 



acters of the glabella. U. S. National Museum, Catalogue 

 No. 58555. 



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



No. 58556. 

 10 and loa. (X 2.) Dorsal view and side outline of pygidium asso- 

 ciated with this species. U. S. National Museum, Catalogue 

 No. 58557. 



