RECORDS OF W.A. MUSEUM. 
162] 
be found abactinally. The heads are less than a millimetre in 
length, but the stalk is nearly two millimetres ; the latter has a con- 
spicuous “ limb,” the branches of which are about .2 of a millimetre 
long. The valves resemble closely those of T. affinis. The triden- 
tate pedicellaria are very slender, the valves, which are hardly .05 
mm. wide, range from .9 to 1.25 mm. in length and meet only near 
tip. The small globiferous pedicellariae have valves ranging from 
.25 to .55 mm. in length and are provided with an end tooth. 
Between Fremantle and Geraldton, W.A., 60-100 fms. Two 
specimens. No. 4,933. 
The occurrence of this distinctly East Indian species off West 
Australia is notable and hardly to be expected. These large speci- 
mens bear a striking superficial resemblance to Phyll acanthus annul- 
fem, but even hasty examination distinguishes them. The low 
collar and the red-brown spots, not to mention the pedicellariae, are 
sufficiently marked differences to be obvious to even a casual 
observer. 
GONIOCIDARIS TUBAKTA. 
Cidariks lubariii, Lamarck, 1816. Anim. s. Vert., vol. 3, p. 57. 
Gonioiidaris tnharia, Liitken, 1864. Vid. Med. f, 1863, p. 137. 
The occurrence of this species on the west coast is interesting, 
even though the specimens are small (20 mm. h.d.). 
Between Fremantle and Geraldton, W.A., 100 fms. Two 
specimens, No. 4,938. 
CENTROSTEPHANUS TENUISPINUS, > 
sp. nov. 
Plate XXVI. 
This species is so nearly related to C. rodgersii of New South 
Wales that an extended description would be superfluous. The 
test is essentially alike in the two species, but there are more coronal 
plates in the one from West Australia. The actinostome is notice- 
ably smaller and the abactinal system is somewhat larger. Thus 
in an eastern specimen, 84 mm. h.d., there are 16 interambulacral 
plates in each colnmn, the actinostome is 36 mm. across and the 
abactinal system is 18 mm., while in a western specimen of the 
same size, there are 18 interambulacral plates in each column, the 
1 Gr. tenuis = slender + spinus = a spine. 
