211 



Costa Rica Miockne — Olsson 39 



or with two board, sub-obsolete folds. In spirifera^ the two folds 

 are strong and recall those seen in the recent T. dislocata. The 

 sutural band is strongly sculptured by the end of the ribs which 

 are entirely dislocated by the deep sulcus. T)^pical specimens 

 have three or four, even spirals, which are stronger than the 

 longitudinal ribs. Variation occurs in the number, and regu- 

 larity or these spirals. 



Length 43, breadth 9 mm. 



Gatun Stage: Banana River, Hill No. i. 

 Water Cay. 



Terebra spirifera Dall, variety midiensis, n. var. Plate i figure 7 



This variety, represented onl}^ by a single specimen from 

 Middle Creek, C. R., differs from typical spirifera, in having on- 

 ly three spirals, which are broad and strap-like in form. 



Gatun Stage: Middle Creek. C. R. 

 Terebra Berlinerae Maury Plate i, figures 17, 18 



Terebra Berlinercs Maury, 1917, Bull. Amer. Pal., vol. 5, p. 19S, pi. 

 4, figs. 7, 8. 



This beautiful species was described by Dr. Maury, from the 

 Cercado (Miocene) formation of Santo Domingo. The whorls 

 are slightly convex, and its sculpture is closer, finer and more 

 delicate than is seen in any of the associated Costa Rican Tere- 

 bras. Our specimens, all imperfect, were collected from the 

 hard Gatun sandstones of Boucary Creek. The most complete 

 specimen measures 21 by 6.5 mm. 



Gatun Stage: Boucary Creek. 



