146 
more specimen from the Cooks Strait was sent me from the Dominion 
Museum of Wellington. I did not myself find any specimens in the 
dredgings which I undertook at Stewart Island in 1914. The species 
has not been recorded from any other locality. There is no record 
of the depth in which it has been found, but it is evident that 
the species belongs to the sublittoral region. 
The measurements of one of the largest specimens in hånd are 
in mm: diameter 26, height 16, peristome 11, apical system 10,5. 
Width of interambulacra at the ambitus 8 mm, of ambulacra 3,5 
—4 mm. The interambulacral plates number 9—10; there are 6 
Fig. 1. Apical system of Goniocidaris umbraculum. a. of a male specimen, 4/1. 
b. of a female specimen. 7,5/1. 
ambulacral plates corresponding to each interambulacral plate at 
the ambitus, only 4 — 5 below the ambitus, and close to the peri¬ 
stome only 3. Test somewhat flattened above. There is a rather 
broad naked median space in the interambulacra, somewhat sunk; 
but it is not deeply grooved at the points where the horizontal 
and the vertical sutures join one another; there is no groove at 
the outer end of the horizontal sutures. The areoles are confluent 
on the oral side, sometimes unto the 6th—7th. The tubercles sur- 
rounding the areoles hardly larger than those of the rest of the 
tuberculated part of each piate; they hardly diminish in size to- 
wards the naked median part, contrary to what is the case e. g. 
in G. geranioides. The ambulacra have a fairly broad, naked, sunken 
median part. There is a single small tubercle close inside the pri¬ 
mary tubercle on each plate, at the lower border; at the ambitus 
