326 WEST SOUTH AMERICAN SHELLS STEARNS. 



151. Cerithium interruptum C. B. Ad. 



Six examples, very solid, knobby, and black. 



Manta. 



Must not be confounded with Menke's interrupUim. 



152. Modulus disculus Phil. 



Three specimens. 



Panama. 



Previously credited to Acapulco and Mazathiu. 



153. Planaxis planicostata Sby. 



Eleven beach shells. 

 Panama. 



Manta; Payta. 



One specimen. 

 Payta. 



154. Serpulorbis squamigera Cpr. 



155. Bivonia compacta Cpr. 



156. Turritella Broderipiana Rve. 



^T. viarmorata Kiener. 



Several specimens. 



Payta; nine from li to 6 inches in length. Manta, one specimen. 

 One semifossil, of large size, must have been 6 inches in length when 

 perfect. 



157. Turritella cingulata Sby. 

 = T. iricarinaia Kiug. 



One specimen. 

 Manta. 



In some places on the coast of Chile this is a common fossil. 

 Sculpture variable. Often more than tri-carinate, and in some in- 

 stances the keels are broken into little beads. 



158. Turritella goniostoma Val. 

 var.=T. Banksii C. B. Ad. 



Several examples. 

 Manta (3); Panama (IS). 



. 159. Tectarius atyphus n. sp. 



One fresh specimen (Mus. No. 483!)G). 

 Manta. 



The first example of this group detected on the west coast of the 

 American continent. 



