SEA LILIES, STARFISHES, ETC.—CLARK. 99 
differs much in different individuals and on different spines ; 
occasionally they merge into more or less complete longitudinal 
lines, but this is unusual; they are often well developed on 
the neck of the spine above the collar. The actinal primaries 
have the collar very wide, and a thick, somewhat serrate 
“cap ”’ formed from the outer layer of the spine. 
The abactinal system is larger than the actinostome, but 
the difference shows some diversity ; in the smallest specimen 
the actinostome is little more than 8 mm., while the abactinal 
system is nearly 12; in the largest specimen the measure- 
ments are approximately 25 and 32; but in a specimen of 
average size the measurements are only 18 and 20. 
The secondary spines show remarkable diversity of colour ; 
in several specimens they are bright red, with those of the 
ambulacra more or less greenish at both base and tip, and 
those of the interambulacra with very slightly greenish tips. 
In other cases they are reddish with purple tips and a longi- 
tudinal purplish stripe, or they are dull flesh-colour with red 
longitudinal stripe. In the largest specimens, all the second- 
aries are more or less greenish, those of the interambulacra 
with darker longitudinal stripe and pink or purplish tip, while 
those of ambulacra are more nearly uniformly dark greenish. 
Evidently no specific character can be drawn from the coloura- 
tion of the secondary spines ! 
The occurrence of globiferous pedicellarize shows an equal 
diversity ; in many specimens they are rare or wholly wanting, 
but in the larger specimens they are generally present, at 
least in the interambulacra, and in several of the biggest 
specimens they are excessively abundant and very con- 
spicuous, as they are white or pale greenish in colour. The 
stalk is 3mm. long (more or less) and has a very conspicuous 
limb. The head is about a millimeter long and the valves 
seem to be like those of P. baculosa. Ihave hitherto laid much 
stress on the absence of globiferous pedicellariz in “‘ Stephano- 
cidaris bispinosa, A. Agassiz,”’ but evidently the two specimens 
previously seen by me were misleading. I can no longer 
doubt that this species and baculosa are congeneric and that 
I have been wrong in counting the latter a Phyllacanthus. 
Since as already shown the name Stephanocidaris must be 
abandoned, I follow Déderlein in using Prionocidaris, of which 
P. pistillaris (=baculosa) is the type, for the group I have 
hitherto called Stephanocidaris, the diagnosis being modified 
to permit the inclusion of baculosa. Thirty-four specimens, 
Locs.—Off Fraser Island, Queensland. 
