267 
NOTE ON THE GENUS PSEUDAMYCLA, Pacr. 
By 8. Pace. 
Read 14th November, 1902. 
Wuen founding! the genus Pseudamycla for the reception of Buccinum 
dermestoideum, Lam., the suggestion was hazarded that Columbella 
miltostoma, Ten.-Wds., might prove to belong to this genus; and the 
subsequent partial examination of the soft parts of the latter species, 
which appears to be specifically distinct from P. dermestoidea, has fully 
justified that surmise. There being thus two known species of 
Pseudamycla, it is now possible to give some account of the characters 
of the group. 
PSEUDAMYCLA, Pace. 
Diagnosis.—Rhachiglossa (sensu lato) having the central tooth of 
the radula small, narrow, and tricuspid; and the lateral teeth of the 
form of elongated triangular plates, which are pointed posteriorly and 
dentate anteriorly. Shell amycleform. Operculum with sub-apical 
nucleus. 
Type-species.—Buccinum dermestoideum, Lam. 
Distribution.—The genus appears to be absolutely confined to the 
south-east coast of Australia and to Tasmania. In this region it is 
represented by two species which are recorded, perhaps erroneously, as 
occurring side by side: P. miltostoma would appear to be more 
typically Tasmanian, while the type-species is more characteristic of 
New South Wales and Victoria. 
Shell.—The shell in its form closely resembles that of assa (Amyela) 
cornicula (Olivi), with which the type-species has in fact been 
confounded, and those of the amycleform species of Columbellide. 
In both species a small denticle, similar to that so highly characteristic 
of Pisania, is occasionally present posteriorly upon the inner wall of 
the mouth of the shell. 
Radula.— A somewhat remarkable detail to which attention was 
not especially drawn when describing the radula of P. dermestordea, 
although it was indicated in one of the figures (ante, p. 256, Fig. 6), 
is the fact that each row of the radula is asymmetrical, in the sense 
that while the lateral tooth of the one side is ‘set in advance of the 
central tooth, the corresponding one of the opposite side les to an 
equal extent behind it. This character is common to both species. 
1 See these Proceedings, ante, p. 255. 
