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Bulletin 35 



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Page 175 



terior side short, its teeth few and small ; margins dentate. 

 Pliocene, Matura. 



Area centrota n. sp. 



Transversely subrhomboidal, with a strong wide carination 

 running from the umbo to the posterior angle ; ornamented 

 with many (36-38) squamosely nodose radiating ribs each 

 with a fine subsidiary thread-like rib in the narrow inter- 

 stice ; anterior margin short, rounded ; posterior margin 

 strongly sinuate, angulate above with the hinge-line and 

 forming a more rounded angle with the strongly crenate 

 lower margin. Hinge-teeth small in the middle of the 

 straight hinge, but becoming larger and diverging consi- 

 derably towards the angles ; ligamental area more or less 

 grooved, especially anteriorly. 



Pliocene, Matura. The nodosities on the ribs are ar- 

 ranged, at least on the disk, in regular longitudinal rows, 

 and the intermediate thread-like ribs are wanting on the cen- 

 tral portion, becoming developed anteriorly and posteriorly. 



Cupularia calyx-glandis n. sp. 



A crateriform species allied to C. pyriforme and C. Owenii 

 but distinguished by its more completely cup-shaped form. 

 The details of the cells are not very easily made out from 

 my specimens, but they seem to resemble C. pyriforme in 

 general arrangement. 



IyOwer Miocene, Manzanilla. 



Pecten anguillensis n. sp. 



Shell fan-shaped, ornamented with radiate muricate striae, 

 and about 10 or 1 1 prominent rounded ribs, which are crossed 

 by concentric striae, the concave interstices broader than the 

 ribs. Upper valve nearly flat, lower one gently concave. 



