134 BuLi^BTiN 39 306 



Persona simillima Guppy, 1876, Quart. Journ. Geol. Soc. London, 



vol. 35, p. 522. 

 Distorsio {Distortrix, Persona) gatunensis Toula, 190S, Jahrb. der K-K 



Geol. Reichsanstalt, Wien, vol, 58, p. 700, pi. 25, fig. 10. 

 Distorsio gatunensis Brown and Pilsbr}', 191 1, Proc. Acad. Nat. Sci. 



Phil., vol. 63, p. 356, pi. 29, fig. 8. 

 Distortrix similliina Maury, 1917, Bull. Amer. Pal., vol. 5, p. 271, pi. 



17, figs. 4, 5. 



Not common in Costa Rica. It also occurs in the Miocene 

 of Jamaica and Santo Domingo. 

 Gatun Stage; Gatuii, C. Z. 



Banana River. 



Port Linion. 



Genus BURSA Bolten 



Bursa crassa Dillwyn Plate 15, figure 15 



Ranella crassa Dillwyn, Reeve, Conch. Icon., fig. i8. 



Ranella crassa Guppy, 1866, Quart. Journ. Geol. Soc. London, vol. 22, 



p. 288, pi. 18, fig. 9. 

 Bursa crassa Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15, p. 212. 

 Ranelta crassa Guppy, 1874, Geol. Mag., p. 438. 

 Ranella crassa Guppy, 1876, Quart. Jouru. Geol. Soc. London, vol. 32, 



p. 522. 

 Bursa crassa Maury, 1917, Bull. Amer. Pal., vol. 5, p. 272, pi. 17 



figs. 6, 7. 



This is a recent species in the West Indies. It occurs also 

 as a Miocene fossil in Jamaica and Santo Domingo. 



Gatun Stage: Banana River. 

 Saury Creek. 



Genus CASSIS I^amarck 

 Cassis sulcifera Sowerby 



Cassis sulcifera Sowerby, 1849, Quart. Journ. Geo 1. Soc. London, vol 

 6. p. 47, pi. ID, fig. I 



