PLATE 71. 



1. 1. Onchus DEWEii. (Pag. 320.) 



1 o. A fragment of shalo, retaining tlie base of the spine, with about two inches of the lower portion, and 

 the impression beyond this nearly to tlie apes. 



1 6. A fragment, retaining the impression of tin; Ijase atid lower portion of the spine of Die preceding spe- 

 cimen, with the liiglicr portion of the spine itself. 



1 c. The basal portion of a much larger specimen, showing very distinctly the ornamented surface and con- 

 stricted base. 



1 d. An enlargement from the surface of 1 c. 



