64 



BULLKTIN 39 



sil shell has a more slender spire and slightly longer anterior 

 canal. 



Gatun Stage: Rio Codes, C. R. 



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

 cleus eroded; fascicle deep and concave, about >^ 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 w^horl about lo; the ribs are crossed b}' 

 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, slightl}^ bent. 



Length 21, diameter 6, last whorl 12 mm. 



A small, ver3^ 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. 



Gatun Stiige: Coco Plum. 



Drillia 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 Vv^eak spirals; the ribs commence 

 at the lower edge of the fasciole, pass slightl}^ 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 



Driliia coccos, n. sp. 



Plate 5, figure 7 



