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71 T. 

 TERTIARY FAUNA OF FLORIDA 



Shell suborbicular, convex, with twenty-one high, sharp ribs separated by 

 V-shaped narrower interspaces, the ribs with a sharp but shallow mesial sulcus 

 and the outer edges of the sulcus sharp and flaring ; submargins smooth, ears 

 radially threaded, inner margin deeply fluted; surface with fine, low, sharp 

 concentric lamella; when perfect; notch small, narrow, sharp, with no ctcno- 

 lium ; cardinal crura well developed, sharply cross-striated ; ears small. Alt. 

 23, lat. 24, cliam. 8 mm. 



This species may possibly belong to sEquipccten, but its aspect is that of 

 Pec ten. I have not seen the left valve. There is an unnamed valve of this 

 species in the Heniker collection. 



Pecten (Euvola) bowdenensis n. s. 

 PLATE 29, FIGURE I. 



Oligocene of the Bowden beds, Jamaica ; Henderson and Simpson. 



Shell resembling P. zicsac L. in the right valve, with about twenty-three 

 obsolete smooth ribs separated by impressed lines; right valve very convex ; 

 ears subequal, smooth, notch narrow, deep; left valve with seventeen low, 

 rounded ribs separated by wider, squarely impressed interspaces ; submargins 

 wide, smooth ; disk moderately concave ; ears subequal, smooth, concavely 

 arched ; interior margin of the base with paired lirae, the pairs separated by 

 deeper channels; cardinal crura obvious. Alt. 43, lat. 44.5 mm. 



The sculpture of the left valve definitely separates this species from the 

 young of P. ziczac, /'. incdiits, and allied forms known from this region. 



Pecten (Euvola) limonensis Dull. 



/,i>i/nr /-7'/V'?/i' r.abb, Joiirn. Acad. Nat. Sci. Phila., 2cl Scr., viii., p. 379, 1881 ; not 

 I'<r/,-/i /,,-T'/!,'Vf///\ C.tilclfuss, Tctrcf., ii., p. 68, pi. 97, tig. 6, 1835. 



Pliocene clays of Limon, Costa Rica; Gabb. 



Pecten (JEquipecten) oxygonum Sowcrby. 

 /'(/< i>x\'i;niuiiii Shy.. (Hiart. Journ. Gcol. Sor., vi., p. 52, \f<^}. 



Rcften aitgwticostatus GaJab, ('.col. St. Dom., p. 256, 1873. 

 l\-ctfii <-.iw.v/V;w///.< C.uppy, ('.col. Journ., xxii., p. 294, 1866. 



Oligocene of St. Domingo, Gabb ; and Jamaica at Bowden, Henderson 

 and Simpson. 



Shell small, suborbicular, with nineteen to twenty-one sharply keeled 

 ribs separated by V-shaped interspaces, with little-elevated, sharp, thin, con- 



