134 



BUI.I.KTIN 39 



3o6 



Persona siniillima Guppy, 1876, Quart. Journ. Geol. Soc. Ivondon, 

 vol. 35, p. 522. 



Distorsio {Distortrix, Persona) gatunensis Toula, 1908, Jahrb. der K-K 

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



Distorsio gatunensis Brown and Pilsbry, 1911, Proc, Acad. Nat. Sci. 

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



Distortrix siniillima Maury, 191 7, 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. 

 Gatim Stage; Gatun, C. Z. 



Banana River. 



Port Limon. 



Genus BURSA Bolten 



Bursa crassa Dillwyn Plate 15, figure 15 



Ranella crassa Dillwyn, Reeve, Conch. Icon., fig. 18. 



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



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

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

 Ranella 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: Bajiana 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. 10, fig. I 



