Bulletin 39 5536 



sil shell has a more slender spire and slightl}'^ longer anterior 

 canal. 



Gatu7i Stage: Rio Codes, C. R. 



Driliia COCCOS, n. sp. Plate 5, figure 7 



Shell small, slender and fusiform; whorls 10 or more, nu- 

 cleus eroded; fasciole deep and concave, about Y2 of the width of 

 a spire-whorl, bordered above b}^ a strong sutural cord, other- 

 wise smooth; sculpture of strong axial ribs, which are lacking 

 from the fasciole and from the base of the last whorl; these ribs 

 number on the last whorl about 10; the ribs are crossed 'hy 

 strong, raised cord-like spirals, there being at first 2 on the earl- 

 iest spire- whorls and on the later 3; the last whorl shows 8 

 spirals and the wide interspaces are occupied by 3 or more small- 

 er ones; additional and more crowded spirals occur on the long 

 slender canal; anterior canal long and slender, slightly bent. 



Length 21, diameter 6, last whorl 12 mm. 



A small, very slender and fusoid species with strong, persis- 

 tent spiral and axial sculpture. A single specimen was collect- 

 ed at Coco Plum, a small cocoanut plantation about 40 miles east 

 of Bocas del Toro. 



Gatiai Stiige: Coco Pkim. 



Drrllia chiriquiensis, n. sp. Plate 5, figure 2 



Shell solid of medium size; whorls 7 (apex lost), of slightly 

 convex profile; anal fasciole small but quite deep and nearly 

 smooth; suture strongly appressed and bordered just below by a 

 strong, elevated spiral cord; sculpture of numerous, somewhat 

 oblique riblets and numerous weak spirals; the ribs commence 

 at the lower edge of the fasciole, pass slightly obliquely across 

 the whorls to the suture or on the last whorl across the base to 

 the canal; the ribs on the last whorl number 15 or 16; spirals of 

 numerous weak threads which are generally alernating in charac- 

 ter; the spirals are very small on the fasciole, quite large and 



