sulcation

The channel or sulcation round the suture of each whorl is very slight, and the adjoining margin obtuse and convex; whereas in E. spirata the channel is broad and deep, having the margin sharply carinated: so far the essential characters of the two shells are at variance; but their difference in colour is so obvious that no one can mistake them.

A species at once distinguished by the entire suture and narrow-pointed spire; the inner lip is very thick, with a longitudinal sulcation near the umbilicus.

Head oblong, narrowed behind, posteriorly deeply emarginate; the mandibles rufo-piceous, brightest at their apex, which is armed with two long teeth which are bent abruptly inwards, their tips black; the anterior portion of the head striated obliquely from the centre; the head, behind the anterior sulcation, very smooth and shining and having a deep longitudinal central depression.

Ferruginous; the flagellum and legs palest; head much narrowed behind, the posterior margin deeply emarginate; mandibles smooth and shining, their inner margin strongly serrated, their apex abruptly bent or elbowed, and armed with two stout teeth; the face anteriorly evenly striated obliquely; the head behind the anterior sulcation very delicately striated obliquely.