HOLOTHURIOIDEA, ASTEROIDEA, AND ECHINOIDEA 391 
head. Fig. 6 gives a representation of a valve of such a large form. These 
valves are found mainly in the oral region, a few also inside the subanal 
fasciole. They are very short-stalked, but have an exceedingly long neck — 
up to 7 mm. long, when fully extended — a feature rather unique in Echinoids. 
One of these large pedicellarize had four valves. Ophicephalous pedicellariz 
were not found by CLARK. I have observed a few of them in the smaller 
specimen. They are of the typical Spatangoid shape (fig. 7). The triphyllous 
pedicellariz were figured by CLARK, but his figure not being very distinct, a 
new one is given here (fig. 8). Numerous slender, irregular, calcareous rods 
are found in the tubefeet, in marked contradistinction to, the other species, 
NV. depressus H. L. Clark, in which the tubefeet are stated to be entirely 
devoid of calcareous particles (H. L. CLARK, Op. cit. p. 150). 
The genital organs of the larger specimen were found to be quite empty, 
thus giving no information of the character of the eggs. Judging from the 
large size of the genital pores, it may, however, be fairly safely concluded 
that the eggs are large and yolky, and the development direct. 
The species is as yet only known from Juan Fernandez, where it was 
found by the »Hassler» Expedition in a depth of 65 fms. It was not refound 
till now. 
It would appear that the genus Wacospatangus is nearly related to Gont- 
maretia, the only essential difference being found in the structure of the globi- 
ferous pedicellarie. Their being referred to two different families, Macosfa- 
tangus to the Paleopneustide, Gonxzmaretia to the Spatangidz, as done by 
H. L. CLarK, therefore does not give a true statement of their natural rela- 
tionship. Also CLARK himself agrees (Op. cit. p. 149) that the position of the 
genus /Vacospatangus is more naturally within the Spatangide. 


