U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 93 PLATE 31 



1 



4-15 



Chthamalus anisopoma Pilsbry: 1, From San Francisquito Bay on Acmaea dalhana 



Pilsbry (X 3.5); 2, Port San Carlos on Tegula rugosa Adams (X 2); 3, Gabriel Bay 



on Ostrea mexicana Sowerby (X 3.5). 

 Chelonibia patula dentata, new subspecies: 4, 5, Internal view of scutum and tergum 



(X 7); 6, carina showing teeth (X 3); 7, 8, external view of scutum and tergum 



(X 7); 9, base of lateral compartment (X 2); 10, internal view of rostrum (X 2); 



11, type specimen from the side (X 1.5); 12, apical view (X 1.5); 13, carinal view 



of type specimen (X 1.5). 

 14. Chelonibia testudinaria (Linnaeus) from La Paz (from collection of M. C. Z.): 



Carina showing teeth (X 1). 

 15, 16. Balanus amphitrite inexpectatus Pilsbry from Estero de la Luna: 15, Scutum (X 6); 



16, lateral view (X 1.5). (Photographs by Don Anderson.) 



