308 
Drillia atkinsoni, Tenison-Woods, Proc. Roy. Soc., Tasmania, 
1876, p. 142, teste Tate and May, loc. cit. 
Siphonalia pulchra, Tenison-Woods, op. cit., 1877, p. 189, 
teste Tenisou-Woods, op. cit., (1879) 1880, p. 70. 
Clathurella crassina, Angas, Proc. Zool. Soc., London, 1880, 
p. 416, pl. xl., fig. 6 
Mr. Sowerby in Proc. Mal. Soc., London, 1896, vol. ii., 
p- 28, identified South Australian shells sent to him by me 
as Clathurella parvula, Reeve. This may be, but is not cer- 
tain. Mr. Hedley has suggested their identity with Drillia 
denseplicata, Dunker, Malak. Blitt., 1871, vol. xviil., p. 
159, from Bass Strait, figured in Conch. Cab. Kiister’s Ed., 
Band iv., Abt. iii., No. 130, p. 107, pl. xxiii., figs. 7 and 9. 
This is most likely, but as it is not certain | have retained 
the name accepted by Tate and May and Gatliff, until the 
types of the two species above referred to can be compared 
with our shells. 
These are very commonly taken in deeper water, and 
they vary so remarkably that they might be differentiated 
into about half a dozen apparently good species but for the 
intermediate forms. It has been taken on the beach from 
Robe to LeHunte Bay in the Great Australian Bight, and 
dredged at all depths from 6 to 300 fathoms. 
The usual form has a somewhat gradate spire, and has 
valid axial cost crossed by well-marked spiral lire. The 
axials may be less valid in a series of specimens until they 
completely vanish and only spirals remain, and the angle 
may fade away as well, until a shell of a seemingly distinct 
species remains, “exactly like the form taken in 100 fathoms 
at Cape Pillar” by Hedley and May. It may become long 
and narrow, and delicate, especially in the greater depths; or 
on the seashore, as on St. Francis Island, it may be very 
short, extremely solid, and with very rough, sturdy sculp- 
ture; or, again, from the greater depths it may be very 
short, very gradate, and with a comparatively long body- 
whorl and without axials, so as to approach close to Drilla 
haswelli, Hedley, and to be recorded by him as a variety of 
this species in his list of mollusca from Cape Pillar in Re- 
cords Austr. Mus., vol. vii., No. 2, 1908, p. 112. 
L bia P 
pP““A7,_A-ElathureHa bicolor, Angas. Vhs 
Clathurella bicolor, Angas, Proc. Zool. Soc., London, 1871, 
pl. i., fig. 20. Type locality—‘Port Jackson’; op. cit., 1880, 
P: 416, “recorded for South Australia”; Tryon, Man  .Conch., 
884, vol. vi., p. 284, pl. xvi.. fig. 61; Pritchard and Gatliff, Proc. 
Roy. Soc., Victoria, 1900, vol. xii., p. 179, ‘‘Western Port.” 
Dredged alive from 5 fathoms to 22 fathoms in Gulf St. 
Vincent and in Spencer Gulf; in 40 fathoms off Beachport, 
