PALEONTOLOGY ZORRITOS FORMATION 127 



having the posterior ear of the right valve smooth, whereas 

 it is ribbed in woodringi. P. perplexus Cooke, 132 from the 

 Oligocene of Anguilla, is similar in general appearance, 

 but has spines between the ribs which are apparently absent 

 in woodringi, and has a larger number of ribs. Pecten cer- 

 cadica Maury, 133 from Cercado de Mao, Santo Domingo, is 

 somewhat similar, but has faintly instead of prominently 

 threaded ears, and has proportionally broader ribs. 



Upper Zorritos. Quebradas Pantheon, del Toro, de las 

 Alturas and del Grillo. 



Superfamily ANOMIACEAE 



Family ANOMIIDAE 

 Genus ANOMIA (Linnaeus) Miiller 



Anomia berryi n. sp. 

 PLATE VII Figs. 6, 7. 



Shell large, heavy, very convex, fairly regular. Left valve 

 much inflated. Umbones usually broad, somewhat incurved. 

 Sculpture of radial ribs, somewhat irregular, between the 

 major ones of which are from three to five minor ribs which 

 are seen under a lens to be crossed by fine, wavy growth- 

 lines, with the formation of something like nodes. The ir- 

 regular, wavy concentric growth-lines are fine from the 

 hinge half-way down the shell ; on the ventral half they are 

 coarse and imbricate. Interior of valves not known. Length, 

 60 ; height, 46.5 ; diameter left valve, 26 mm. 



This species is an unusually large and heavy species. It 

 differs from most of the species common to the American 

 Tertiary, but recalls some varieties of the European A. 

 ephippium, of which the variety rugulosostriata Brocchi, 134 



132 Idem., figs. 8, 9, 10. 



133 Bull. Amer. Pal., vol. 5, No. 29, p. 188, pi. 34, fig- u, IQI 

 134 Sacco, Piemonte, pte. 23, p. 34, pi. 10, figs. 18-24, 1897. 



