20 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Descri-ption. — "Shell subulate, turrited, with longitudinal undu- 

 lations, which on each whorl of the spire are crossed by three 

 equidistant prominent spiral lines; whorls indented above; inden- 

 tations finely striated; suture margined by a carinated line; body 

 whorl with about thirteen spiral lines; aperture more than one- 

 third the length of the shell. Length, three-fourths of an inch." 

 Conrad, 1834. 



General Characters. — Shell rather large, robust. Aperture ap- 

 proximately one-third the total altitude. Whorls probably 8 to 

 10 in number, concave posteriorly, straight sided or gently convex 

 in front of the fasciole. Body smoothly contracted at the base. 

 Appression of the whorls rather marked. Suture line incon- 

 spicuous. 



Protoconch. — Apex broken away in all available material. Nu- 

 cleus apparently small. 



Scul-pture.- — External 'sculpture vigorous, both axial and spiral. 

 Axial costae rather strongly elevated, rounded, somewhat undu- 

 latory and slightly protractive, 12 to 14 in number on the later 

 whorls, persisting with undiminished strength to the anterior 

 suture but quite abruptly evanescent posteriorly at the margin 

 of the fasciole; on the body whorl, weakening a little in front of 

 the periphery and becoming obsolete before reaching the pillar 

 and, in the older forms, irregular or altogether obsolete toward the 

 aperture; intercostal areas concave, narrower than the costals. 

 Spiral sculpture of broadly arched, rather prominent, primary 

 fillets, uniform in strength on both the costal and the intercostal 

 areas, 9 to 11 in number on the ultima, 3 or 4 upon the penultima, 

 usually, though not always, equal or sub-equal in size and spacing; 

 intercalaries absent in the type but present, as a rule, to the num- 

 ber of 1, 2, or 3 between the primaries of the later whorls; posterior 

 fasciole obscurely undulated anteriorly by the axial sculpture, 

 spirally threaded with 4 to 6 fine, close-set lirae with 1 or 2 stronger 

 cords at the posterior margin, directly in front of the suture line. 

 Anterior canal sculptured with 4 to 6 crowded lirae. 



Aj)erture. — Aperture narrow, obliquely lobate, obtusely angu- 

 lated at the posterior commissure. Labrum somewhat flaring; 

 posterior siphonal notch very narrow, but rather deep. Labium 

 gently excavated at the base of the body whorl. Pillar straight, 

 moderately long, simple. Parietal wall and pillar heavily rein- 

 forced. Anterior canal rather long and broad, obtusely truncate 

 at the extremity. 



