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tentacles of the inner circle having thus not yet appeared. — The 
entrance to the mouth is finely papillate, whereas no circle of papillæ 
surrounding the circles of tentacles is found, such as is the case 
in Ps. bicolumnatiis Dendy & Hindle, the other New Zealand species 
of the genus Pseudocucumis. 
The calcareous ring is simple, the interradial pieces small and 
siender (Fig. 39). The powerful retractor muscles are attached about 
in the middle of the body. There are two large Polian vesicles 
(Fig. 39), joining at the base, and one short stone-canal w.ith a 
complicate, folded, madreporic head. Genital coeca numerous, fine, 
intermingling, but hardly branching. The respiratory trees well 
branched. The oesophagus is somewhat widened in its lower part, 
where it passes into the intestine; it is distinctly papillate here (on 
its outer surface), the papillæ not passing on to the intestine. 
Calcareous deposits exceedingly scarce, only very rarely a ru- 
dimentary one may be found in the skin; in the anterior, introverted 
part they are slightly more common and better developed. They 
are tables (Fig. 40.a), with a somewhat irregular disk and a small 
spire of two columns. The tubefeet have a well developed terminal 
disk-plate, but otherwise no spicules at all. In the tentacles are 
found fairly numerous fine rods (Fig. 40.b) in the branches, but 
none in the stem. The papillæ of the mouth contain finely branched, 
elongate spicules (Fig. 40.c). 
From Pseudocucumis bicolumnatus this species is very well dist- 
inguished through several characters: The calcareous deposits are 
very numerous in bicolumnatus and also different in structure (with 
a round disk); the shape of the calcareous ring is different in the 
two species (cf. PI. 11. 6.a of Dendy & Hindle’s paper), and 
there is ' only one Polian vesicle in bicolumnatus. 
16. Pseudopsolus macquariensis (Dendy). 
Psolus macquariensis. Dendy. 1896. Observations on thé Holothurians 
of New Zealand. Journ. Linn. Soc. Zool. XXVI. p. 
41. PI. 7.70—72- 
— — Farquhar. 1898. Echinod. Fauna of New Zea¬ 
land. Proc. Linn. Soc. N. S. W. p. 325. 
Pseudopsolus — Ludwig. 1898. Holoth. Hamburg. Magalh. Sam- 
melreise; p. 49. 
