128 



Bulletin 39 



300 



til red body- whorl and a long attenuated spire; v/horls '6 plus 

 (apex broken so that at least one complete whorl is lost from the 

 type specimen); the first 4 whorls are smooth, after which a 

 few incised spiral lines appear just below the upper suture; these 

 spirals gradually increase in strength and in number and on the 

 following whorls have become strong, raised spiral cords; the pen- 

 ultimate whorl has 5 spirals, the last about 24 (including those 

 of the anterior canal); the upper half of the last whorl and some- 

 times the penultimate, are longitudinally plicated with 18 rib-like 

 costae; aperture narrow, with a thickened outer lip, notched 

 above and obsoletely denticulated below; the inner lip is smooth; 

 canal short, twisted. 



Length 16, diameter 8.5, aperture 9, spire 7 mm. 

 An unusually short and broad species, distantly related to 

 the C. pulcheri'ima Sowerby, recent from the Gulf of Dulce. Two 

 specimens were collected from the Gatun sandstones of Water 



Shell solid, ovate, w^ith a long attenuated spire; last whorl, 

 large, flattened or contracted about the middle; whorls about 9^; 

 the first 6 whorls are smooth and form the long attenuated spire; 

 faint longitudinal plicae appear on the 7th, which increase in size 

 and form the rib-like costae on the later whorls; axial ribs persist- 

 ent and number on the last whorl about 15; the spirals begin 

 shortly after the first appearance of the longitudinal plicae as 

 faint incised lines near the upper suture; these spiral lines are 

 further increased by the introduction of more lines below and be- 

 come on the following whorls raised spiral cords; the penulti- 

 mate whorl has 5 or 6 spirals, the last with about 20; the spirals 

 vary in strength on individual shells and on some specimens may 

 be lacking from the middle of the whorl, forming a smooth me- 

 dian band; aperture linear, small and coutracted and with a cal- 

 loused inner and outer lip ; outer lip strongly thickened, notched 

 above and feebly dunticulated below; canal short, straight. 



Plate 10, figures 8, 17 



