As Megatebennus africanus:
This is the shell recorded by Smith from Port Alfred as Fissurellidaea concatenata G. & F., hitherto known only from S. Australia and N. S. Wales, and certainly the two forms have a remarkable resemblance. Apart from the inherent improbability, however, of so disconnected a range, I think that attention to the following points will suffice to discriminate the two species : The Australian shell is elongately oval and distinctly narrowed anteriorly; its perforation is large, oblong in shape, and about one-fifth of the length of the shell; its sculpture is very coarse, deeply excavated, and the honey-combing extremely irregular; the South African species is irregularly short oval without narrowing; the perforation is smaller, and from short oval to all but circular; the sculpture is much less coarse, less raised, more regular and homogeneous.
Length 17 mm., breadth 12 mm.
HAB.—Port Alfred (Turton).
Type in coll. Tomlin.
The sculpture is not shown in the figure.
The genus Megatebennus as characterized by Pilsbry also includes scutellum (Gmel.) and incarnata (Krauss).