207 



Costa Rico Miocene — Olsson 



35 



ORDER CTKNOBRANCHIATA 



(A) SUPER-FAMILY TOXOGLOSSA 



Genus TEREBRA Adanson 

 Terebra subsulcifera Brown and Pilsbry 



Terebra subsulcifera Brown and Pilsbry, 1911, Proc. Acad. Nat. Sci. 



Phila., vol. 63, p. 339, pi. 22, fig. 7. 

 Te7'-eb7^a {3Iyitrella) stibsulcifera Cossm.2inn,i()i-i), Jour, de Conchylio- 



logie, vol. 61, p. 14, pi. I, fig. 25. 



The single, fragmentary specimen comes from the Gatun 

 beds of Mt. Hope in the Canal Zone. From bipartita, which it 

 resembles in its sculpture, this species and haitensis Dall, differ 

 in having only a single columellar fold. 



Gatun Stage: Mt. Hope, Caiial Zone. 

 Terebra cf, haitensis Dall Plate i, figure 3 



Terebra haitensis Dall, 1895, Proc. U. S. Nat. Mus., vol. 18, p. 35. 

 Terebra haitensis Dall, 1903, Trans. Wagner Free Inst. Sci., vol. 3, pt. 



6, p. 1632, pi. 59, fig. 30. 

 Terebra haitensis Maury, 1917, Bull. Amer. Pal., vol. 5, p. 194. pi, 4, 



fig- 3- 



The collection contains a single, imperfect shell from Sousci 

 Creek, which should probably be referred to this species. From 

 the subsulcifera, it differs in its more numerous and oblique ribs, 

 and wider, less pronounced spiral bands. Like subsulcifera, the 

 columella carries a single, sharp plication. Our specimen con- 

 vSivSting of only 5 whorls measures 37 by 13 mm. 



Gatun Stage: Sousci Creek, a branch of Hone Creek, C. R. 



Terebra bipartita Sowerby Plate i, figure i, 2. 



Terebra bipartita Sowerby, 1849, Quart. Jour. Geol. Soc. London, vol. 

 5, P- 47. 



