377 
? Chiridota geminifera. Dendy & Hindle. 1907. Additions to the 
knowledge of New Zealand Holothurians. Journ. 
Linn. Soc. Zool. XXX. p. 112. PI. 14 so. 
Non. Trochodota diinedinensis. M. J. Allan. 1911. Trochodota dunedi- 
nensis in Victoria. Trans. Amer. Microsc. 
Soc. III. 30. p. 325. (= Trochodota allani 
Joshua). 
— — — H. Ohshima. 1914. The Synaptidae of 
Japan. Annot. Zool. Japan. VIII. p. 478. 
{Tr. diasema H. L. Clark). 
— Chiridota aiistraliana Stimps. Théel 1886. Challenger Holoth. 
II. p. 16. 
Masked Island, Carnley Harbour, Auckland Isl. Under stones, at low 
water, and among Melobesia on the rocky shore. 30/XI. 1914. 
Numerous specimens. 
Figure 8 Isl., Carnley Harbour, Auckland Isl., under stones, at low water 
2/XIL 1914. Several specimens. 
Perseverance Harbour, Campbell. Isl.; under stones, at low water 9/XII. 
1914. 1 specimen. 
A doser examination of these specimens, taken on the type- 
locality of D e n d y’s Chiridota benhami, has made it clear that the 
latter species cannot be distinguished from Trochodota dunedinensis. 
The characters given by Dendy as distinguishing benhami from 
dunedinensis are these; The digits of the tentacles do not increase 
gradually in size from base to apex, the terminal pair being con- 
siderably larger than any of the others; the diameter of the wheels 
is only about half the size of those of dunedinensis (0.o53~0.ot^7 mm 
in diameter, against about O.ie mm); the wheels are numerous in 
dunedinensis, few and scattered in benhami, and the inner margin 
of the rim of the wheels is much more finely toothed in dunedi¬ 
nensis than in benhami, there being about 100 teeth in the former, 
only 35—40 in the latter. These would certainly be very good 
distinguishing characters, if they did hold good; but the rich ma- 
terial in hånd shows that they do not hold good. 
The digits of the tentacles increase very gradually in size from 
base to apex; according to the State of contraction they may all be 
quite short and thick or long and siender, the terminal ones being, 
of course, the longest. The wheels are generally rather numerous, 
especially in the larger specimens; their size varies from O.oe to 
0.16 mm, O.io to 0.i4 being the usual size. So small as O.53 I have 
