FIJI-NEW ZEALAND EXPEDITION 77 
green and olive to a very dark, somewhat purplish brown. Some 
had distinctly barred spines, and in others the spines were light 
green with a sub-terminal band of dark brow and pure white 
tips. The largest specimen of all had white spines while the test 
was almost black. This species is doubtless Echinometra lucunter 
and is recorded from Fiji in Agassiz’ great work, ‘‘The Revision 
of the Echini.’’ Some specimens are quite large for this form. 
A few Diadema were found, and one seemed very much like the 
West Indian species, although a specialist would doubtless find dis- 
tinguishing specific characters. Another form which, judging from 
Agassiz’ figures and description, I am inclined to think belongs 
to the genus Echinothriz, is described by him as having spines 
of two sorts; ‘‘the one being very fine elongated silk-like spines 
and the other large, verticillate or longitudinally striated spines, 
not as hollow as in Diadema, but having more the solidity of those 
of Astrophyga.’’® This is much like a Diadema in appearance, 
but the two sets of spines are sharply distinguished. The larger 
set is not characterized by the imbricating whorls of scales so well 
shown in Diadema, but is much more like the ordinary cidaroid 
type where thin and definite longitudinal rows of denticles are 
found. These spines are almost as long as those of Diadema but 
are stouter basally in proportion to their length. In one specimen 
these are jet black, in another they are barred with dark brown 
and very pale green, almost white. Another set of spines is placed 
between the larger ones and characterized by extreme slenderness, 
appearing rather like stiff hairs than spines. These are black in 
the black specimens and finely barred in the one with the barred 
primary spines. The actinostome is much like that of Diadema, 
but the buccal feet are more numerous and not so prominent. The 
apical system also resembles that of Diadema. Not daring to de- 
nude the test and thus reveal the tubercles, I am much handi- 
capped in studying these specimens which I at first mistook for 
Diadema. 
A small form, probably of this same species, shows the buccal 
feet without plates, a distinct anal cone and a few spines on the 
plates of the apical system. The distinction between the two sets 
of spines is not so great as in the larger and presumably older 
specimens. 
Another specimen bears some resemblance to Strongylocentrotus 
8 Revision of the Echini, pl. 111°, figs. 1 and 2. 
