434 SMITHSONIAN MISCELLANEOUS COLLECTIONS N'OL. 64 



DESCRIPTION OF PLATE 56 



I'ACF. 



Corynexochus senectus (Billings) (see pi. 55, figs. 7, ya-c) 319 



Figs, i, i'. (X3.) Dorsal view and side outline of cranidium with 

 most of test exfoliated. U. S. National Museum, Catalogue 

 No. 62726. 



la, lb. (X5-) Small cranidia somewliat distorted. U. S. National 

 Museum, Catalogue Nos. 62727, 62728. 



ic, ir'. (X4.) Cranidia shortened by slight distortion, with side 

 outline of the longest one. U. S. National Museum, Cata- 

 logue No. 62729. 



id. (X6.) Associated hypostoma. U. S. National Museum, Cata- 

 logue No. 62730. 



i^, le'. (X4-) Dorsal and side view of a pygidium. U. S. National 

 Museum, Catalogue No. 62731. 



i/- (X4-) Fragment of a pygidium showing an antero-lateral 

 spine and a trace of a second spine back of it. U. S. Na- 

 tional Museum, Catalogue No. 627^2. 



ig- (X4-) Small pygidium. U. S. National Museum, Catalogue 

 No. 62733. 



The specimens represented by figs, i, ici-g, are from limestone at 

 locality 41 1, Lower Cambrian: Bonne Bay, Newfoundland. 



Corynexochus buharis Walcott 314 



Figs. 2, 2'. (X3-) Dorsal and side view of a laterally compressed 



cranidium. U. S. National Museum, Catalogue No. 62734. 



2a. (X3-) Side view of a convex cranidium. L^^. S. National 



Museum, Catalogue No. 62735. 

 2b. (X8.) Ridged surface of a glabella. U. S. National Museum, 

 Catalogue No. 62736. 



The specimens represented by figs. 2, 2a-& are from limestone at 

 locality 20, Lower Cambrian: Bic Harbor, Quebec, Canada. 



3. 3'- (X2.) Dorsal and side view of a large cranidium. U. S. 



National Museum, Catalogue No. 6272,7- 

 30. (X 3-) Free cheek with outline of spine restored from another 



specimen. U. S. National Museum, Catalogue No. 62738. 

 T,b, 36', 2,b". (X 3") Dorsal, side and front views of a very perfect 



and convex cranidium. U. S. National Museum, Catalogue 



No. 62739. 

 3t-, zc'- (X 3-) Dorsal and side view of a cranidium shortened by 



distortion. U. S. National Museum, Catalogue No. 62740. 

 id, 3d'. (X2.) Dorsal and side view of a large pygidium. U. S. 



National Museum, Catalogue No. 62741. 



