1 68] 
RECORDS OF W.A. MUSEUM. 
ally, much smaller abactinally, terete, nearly smooth, those about 
mouth stoutest. Miliary spines minute, abundant, similar to those 
of P. lesueuri. Pedicellariae very scarce ; the single tridentate that 
was found, was similar to those of lesueuri. 
Colour abactinally, light reddish brown ; the red is very marked 
when the test is moistened ; actinally the colour is more yellow- 
brown. 
Carnac Island, near Fremantle, W.A., Dec. xi, 1909. One 
specimen, No. 3936. Type. 
I have been greatly in doubt as to whether this specimen 
represents a new species or is a peculiar individual variant of P. 
lesueuri, Agass. Comparison with numerous specimens from 
Queensland and from the East Indies has failed to satisfy my 
doubts, but as lesueuri has hitherto been found only on the eastern 
coast of Australia and does not reach so far south as Bass Strait, I 
have decided to give this West Australian specimen a new name 
indicative of its strikingly peculiar shape. Compared with a speci- 
men of lesueuri from Queensland, of the same length, the following 
peculiarities are noted : — 
1. The test is remarkably narrow; its greatest width is 
not much over 80 % of its length, while in lesueuri it is 
distinctly over 90%. 
2. The test is abruptly narrowed back of the mouth ; its 
width 30 mm. back of mouth is less than 65% of its 
length while it is more than 78 % in lesueuri at the 
same point. 
3. The petals are shorter, wider and much more open at 
the tip ; in lesueuri the petals are open only 1 mm. or 
less. 
4. The test is thinnest at the margin; in lesueuri the test 
is a trifle swollen at the margin and is thinnest several 
millimetres proximal to margin. 
5. The test seems to be more finely and uniformly granu- 
lated than in lesueuri. 
While the last three of these characters are certainly more or less 
variable in lesueuri, and hence of doubtful value, the combination of 
the five in this Carnac Island specimen gives it a general appear- 
ance totally unlike that of any Peronella I have ever seen. The 
collection of a few more specimens on the West Australian coast 
would show whether aphnostina is a valid species or not. 
