172 
To the careful description of this species given by Farquhar 
I shall only add that in the larger specimen before me (8 mm 
diameter of disk) the shape of the ventral plates is somewhat dif- 
ferent from that shown in Farquhar’s figure, these plates being 
more broadly in contact than there (Fig. 34). The difference is 
simply due to age. In the second specimen before me (5 mm dia¬ 
meter of disk) the ventral plates have exactly the shape given in 
F a r q u h a r’s figure (from a spec¬ 
imen 6 mm diameter of disk.) 
It may also be pointed out 
that the genital slits are very 
short, reaching from close by the 
oral shield to the end of the 
second armjoint; in the smaller 
specimen they are still shorter, 
not reaching beyond the first 
armjoint. 
The species was known hith- 
erto only from the coast off Well- 
ington. It has now been shown to 
occur along the Fast coast of the 
North Island of New Zealand up 
to the northern end, and most probably it will thus prove to occur 
along the whole coast of the North Island. 
From the other species of Ophioplocus hitherto described it is 
easily distinguished through its single tentacle papilla (the semi- 
circular rim along the outer side of the tentacle pore is found also 
in the other species) and through the armspines being only two. 
39. Pectinura cylindvica (Hutton). 
Figs. 35.1— 2 . 
Ophiura cylindrica. Hutton. 1872. Catalogue Ech. New Zealand, p. 3. 
Descr. new Starfish from N. Zealand. P. Z. S p. 811. 
Ophiopeza — Farquhar. 1895. Notes on some New Zealand 
Echinoderms. Trans. N. Z. Inst. XXVII. p. 198. 
— — Farquhar. 1897. A Contribution to the History of 
N. Z Echinoderms. Journ. Linn. Soc. Zool. XXVI. 
p. 190. PI. XIV. figs. 4-5 
— — Farquhar. 1898. On the Echinoderm Fauna of N. Z. 
Proc. Linn. Soc. N S. W. p. 306 
