70 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



incremental lines inconspicuous; spiral sculpture of (on the spire 3, 

 on the last whorl 9) strong spiral, equal and equidistant spiral 

 threads, with wider interspaces, and slightly swollen where they over- 

 ride the ribs; between these, in the interspaces, are two or more 

 extremely fine intercalary threads, or striae; aperture sublunate; 

 outer lip (in the specimen) thin, simple; body not callous; pillar 

 short, keeled at the edge of the short canal ; siphonal f asciole incon- 

 spicuous with no marked constriction behind it. Length 7.5, maxi- 

 mum diameter 4 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. 



Type-specimen from the Post collection, U. S. Nat. Mus. No. 

 165081. 



This specimen may not be quite mature. It appears from its sculp- 

 ture to be a member of the group to which Nassa acuta Conrad 

 belongs. 



ALECTRION ETHELINDA, new species. 



Plate 13, fig. 17. 



Shell small, subturrited, thin, of about 5| w^horls separated by a 

 deep but not channeled suture ;• whorls prominently rounded, the 

 shoulder marked and situated not far in front of the suture ; nucleus 

 of about one whorl, smooth and subglobular; subsequent w^horls 

 sculptured; axial sculpture of (on the last whorl 10) narrow rounded 

 ribs, extending from the suture to the siphonal fasciole, with sub- 

 equal much wider interspaces ; spiral sculpture of very numerous fine 

 equal threads, with equal or somewhat narrower interspaces, cover- 

 ing evenly the whole surface of the whorls, overriding but not 

 nodulating the ribs; aperture semilunate, the outer lip sharp edged, 

 faintly varicose, internally smooth in the type-specimen which may 

 not be quite mature, and would possibly have developed lirae later; 

 inner lip short, straight; canal short, deep, with a strong spirally 

 striate siphonal fasciole, keeled behind, with a deep' constriction 

 behind the keel; body, in the type-specimen, without callus, which 

 might have been supplied in the fully adult shell. Height of shell 

 11.2, of last whorl 7.5, maximum diameter 6.2 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. 



One specimen from the Post collection, U. S. Nat. Mus. No. 165080. 



ALECTRION GARDNERAE, new species. 



Shell short, stout, inflated, acute, with five rapidly increasing 

 whorls; nucleus smooth, minute; subsequent whorls with (on the last 

 whorl 8) stout ribs most prominent on the periphery and fainter 

 toward the suture and the base ; these are overrun by numerous strong 

 subcarinated threads with on the later whorls a much finer inter- 



