I04 Bulletin 39 376 



crossed b}' strong spirals with finer threads in between; on the 

 last whorl there are 7 ribs, which commence on the base, just 

 above its union with the long canal, and continue across the 

 whorl to the suture; the early spire- whorls have 6 or 7 strong 

 spirals with i, 2 or 3, fine threads betv^^een; on the penultimate 

 whorl, the earlier spirals have become a primary set of 6 or 7, 

 with their intervals occupied by a secondar}^ set, nearlj^ as large 

 as the primary, and still smaller tertiar3^ threads; the last whorl 

 has about 18 strong spirals in addition to those on the canal; on 

 the canal the division into primar}^ and secondary spirals is bet- 

 ter shown, there being about 16 primary and the same number of 

 secondar}^ spirals; on the extreme tip of the canal the spirals are 

 very small and numerous; aperture small, rounded, with the out- 

 er lip internal!}^ lirated and three or more oblique plaits on the 

 columella. 



Height 100, diameter 24 mm. 



This fine species is closel}'^ related to the recent Fusus eucos- 

 mius Dall, from the Florida coast and the West Indies. The spire 

 of eucosmius is more slender, has 8 ribs instead of 7, and the out- 

 er lip is always smooth, while it is strongly lirated in miocos- 

 mius. 



Gatun Stage: Bocas del Toro, Pajiama. 

 FUSISS honensiS, n. sp. Plate 8, figure 6 



Shell resembling in general features the F. rniocosmius, and 

 with the same number of ribs; the spire is somewhat longer than 

 the anterior canal; the whorls are somewhat more convex than 

 those of 7niocosviuis due to the more strongl}^ knobbed ribs; the 

 ribs are crossed on the penultimate whorl by about 6, strong, even 

 spirals, there being no secondaries and only occasionally a small 

 thread may appear in their intervals; the last whorl, exclusive 

 of the canal shows lo or ii spirals to which are added 17 or 18 

 on the canal; the canal is relativel)^ short and not perfectly 

 straight; the aperture is probably rounded (largely broken on the 

 type specimen) and with its outer lip internally lirated. 

 Height 63, diameter 20 mm. 



