311 Costa Rico Miocene — Oi^sson 139 



Genus DOLmWl Lamarck 



Subgenus P^ALEA Valenciennes 



MaSea eUiptica Pilsbry and Johnson Plate 12, figure 2 



RIalea elliptica Pilsbry and Jolmson, 1917, Proc. Acad, Nat. Sci. Phila., 

 vol. 69, p. 169. 



The true Malea camu7'a Guppy, so common in the Miocene 

 of Jamaica and Santo Domingo still remains to be collected in 

 Costa Rica. It is usually a smaller species (height 60 mm) with a 

 heavier shell and high, narrow, special bands numbering about 

 16 or 17 rather widely separated. 



The M. elliptica is larger (height 60-80 mm or more), more 

 globose and thin. The spiral bands numbering about 22 are 

 closel}' spaced and ribbon-like. The coiling is regular, while in 

 camiu^a the coiling is irregular and descending in the latter 

 stages of growth. 



The Malea elliptica was described but not figured by John- 

 son and Pilsbr}^ from the Miocene of Santo Domingo. 



Height 63, diameter 54 mm. 

 Uscari Stage: Red Cliff Creek. 

 Gatun Stage: Bocas del Toro. Estrella River. 

 Hill la, Banana River. 



Genus CYPRAEA Linne 



Cypraea parlsimina, n. sp. Plate 12, figure 10 



Shell small, more or less depressed and with expanded, an- 

 gulated sides; dorsal surface convex, but with a deep pit or 

 depression at its posterior end, beyond which project the 2 

 short, pouting ends of the lips of the aperture; ventral sur- 

 face flat, with a narrow aperture which is straight except near 

 at its posterior end where it is slightly curved; lips strongly 

 but regularly crenulated (about 21 on each lip) posterior sinus 



