43^ SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 57 



PAGE 



Corynexochus {Bonnia) parvulus (Billings) (see pi. 64, fig. 6) 328 



Fig. I. (X 10.) Enlargement of cranidium shown by ib, to illustrate 

 surface. 

 lb, lb'. (X 3-) Dorsal and side views of a finely preserved cranid- 

 ium. U. S. National Museum, Catalogue No. 62744. 

 ic, \c'. (X3-) Dorsal and side views of a pygidium. U. S. Na- 

 tional Museum, Catalogue No. 62745. 



The specimens represented by figs, i, ib-c are from the limestone 

 of locality 41k, Lower Cambrian : Forteau Bay, Labrador. 



Corynexochus (Bonnia) busa Walcott (see pi. 60, figs. 3, 3a-c) 326 



Fig. la. (X 10.) Enlargement of surface of specimen figured on 

 pi. 60, fig. 3a. U. S. National Museum, Catalogue No. 62774. 



Corynexochus capito Walcott 315 



Figs. 2, 2'. (X 2.) Dorsal view and side outline of a convex cranidium. 

 U. S. National Museum, Catalogue No. 62746. 

 2a, 2a'. (X I-5-) Pygidium (and side outline) associated with the 

 specimen represented by fig. 2. U. S. National Museum, 

 Catalogue No. 62747. 

 The specimens represented by figs. 2, 2a occur in a leached cal- 

 careous sandstone at locality 48b, Lower Cambrian : York forma- 

 tion ; roadside north of Highland Park, York, Pennsylvania. 



2b. (X 2.) Cranidium flattened by compression in shaly sandstone. 



U. S. National Museum, Catalogue No. 154210. 

 2c, 2d. (X2.) Cranidia distorted by lateral compression. U. S. 



National Museum, Catalogue Nos. 15421&, IS42U-. 

 2e, 2e' . (X2.) Dorsal and side views of a slightly compressed 



pygidium. U. S. National Museum, Catalogue No. 15421^. 



The specimens represented by figs. 2b, 2c-e are illustrated by Wal- 

 cott on plate 31, figs. 2, 2a, 2b, Bull. U. S. Geol. Surv., No. 30, 1886, 

 and later as indicated in synonymy of species. 



The specimens occur in an impure shaly sandstone at locality 25, 

 Lower Cambrian: just above Parker's quarry, Georgia, Franklin 

 County, Vermont. 



Corynexochus brennus Walcott 314 



Fig. 3. (X4-) Dorsal view of the type specimen of the cranidium. 

 U. S. National Museum, Catalogue No. 62748. 

 3fl. (X 2.) A larger pygidium of the same type as that represented 



by fig. 2>b- U. S. National Museum, Catalogue No. 62749. 

 2,b, 2ib'. (X 4-) Dorsal view and side outline of a small pygidium 

 associated with the specimens represented by figs. 3, 2)0- 

 U. S. National Museum, Catalogue No. 62750. 



The specimens represented by figs. 3, 3a-& are from a limestone 

 boulder of the Bic conglomerate at locality 2 o, Lower Cambrian: 

 Bic Harbor, Quebec, Canada. 



