PLATE XI. 
Figs. 1, 2. Trigonia rumcostata sp. n. (p. <;:'>). 
Side and profile views of the type specimen. 
Fig. 3. Trigonia co.nferticostata sp. n. (p. 63). 
Fig. 1. Astabte breviacola sp. n. (p. 64). 
Figs. 5, <*>. Astarte posticalva sp. n. (p. 67). 
Fig. "i. Lefl valve of type enlarged - diameters. 
Fig. ('). Dorsal view of another specimen. 
Fig. 7. Astarte craticula sp. n. (p. 68). 
Figs. 8. '•>. Astarte? esodontoides sp. n. (p. <',7). 
Fk;s. 10, 11. Astarte mai.onensis Cragin (p. <'>r>). 
Sec PI. XII for additional figures. 
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