335 
which close over the relracted tentacles. Also those around the 
anal opening are somewhat elongate, forming anal teeth; these 
latter remain, more or less distinet, also in the adult specimens. 
The occurrence of this species at Macquarie Island is of con- 
siderable zoogeographical interest, and a striking parallel to the 
occurrence of Pseudopsolus macquariensis at Stewart Island, as re- 
corded in the present paper. The coincidence is, however, so re¬ 
markable that I cannot withhold the suggestion that it might perhaps 
be due to an intermingling by the labelling, so that the Pseudo¬ 
psolus came really from the Macquarie Isl., the Cuc. brevidentis from 
Stewart Island. In any case, I would not think it definitely proved 
that C. brevidentis oceurs at Macquarie Island, and, inversely, Pseu¬ 
dopsolus macquariensis at Stewart Island, until new facts are avail- 
able. It must be conceded, however, that such distribution is by 
no means unlikely; both forms being littoral they might easily be 
transported from one place to the other by means of the large 
algæ, among the roots of which they may live attached. 
The statement of the occurrence at Juan Fernandez of Cuc. 
brevidentis (Ludvig. Op. cit.) is due to a mistake. The Juan 
Fernandez-specimens are really Cuc. calcarea Dendy (see under 
that species). 
5. Cueumavia calcarea (Dendy). 
Colochirus calcarea. Dendy. 1897. Observ. Holoth. N. Z. Journ. Linn. 
Soc. Zool. XXVI. p. 38 . PI. 5 . 44—53- 
— — Farquhar. 1898. Echinod. Fauna N. Z. Proc. 
Linn. Soc. N. S. W. p. 325. 
— brevidentis. Ludvig. 1898. Holoth. d. Samml. Plate. Zool. 
Jahrb. Suppl. IV. p. 442. Taf. 26. 22 — 29 - 
Non: Cueumaria brevidentis (Hutton). 
Slippér Island; the coast, at low water. 20/XII. 1914. 30 specimens, to- 
gether with specimens of Cuc. brevidentis. 
Paterson Inlet, Stewart Island; 5—15 fms. 17/XI. 1914. 1 specimen. 
The largest specimen, from Slipper Island, is 20 mm long, the 
tentacles not retracted. The specimen from Stewart Isl. is of the 
same length, but very mueh contracted and accordingly was con- 
siderably larger in life, probably some 30 mm long. 
Ever since Ludwig in 1898 (Op. cit.) declared Dendy s 
Colochirus calcarea to be identical with Cuc. brevidentis (Hutton) it 
