30 THE ECHINODERMS OF TORRES STRAIT. 
ring the specimen from Booby Island to Gray’s species and I feel equally sure that Koehler’s 
specimen from the Aru Islands is the same. Koehler lays great stress on the grouping of 
tubercles on the abactinal plates near the tips of the rays, but this is indicated in Gray’s 
figure and is mentioned in Sladen’s description. On the eastern coast of Australia from 
Fraser Island south to Port Jackson, occurs A. acuta Perrier, which is easily told from 
tuberculosa by the more or less swollen disk, more slender rays, more spiniferous abactinal 
surface, and much larger pedicellariz on the inferomarginal plates; this difference in the 
inferomarginal pedicellarie seems to be very constant. The other Anthenea to which 
tuberculosa seems most nearly allied is A. pentagonula (Lamarck) of the Chinese coast, 
but in this species the whole abactinal surface is thickly covered with pedicellariz and 
spinelets, whereas in tuberculosa abactinal pedicellaria# and spines are relatively few and 
scattered, much of the surface being perfectly smooth. In pentagonula, too, the rays are 
more slender than in tuberculosa. 
We met with A. tuberculosa in Torres Strait but twice. The first specimens seen were 
two large adults picked up on Prince of Wales Island, September 13, 1913; they had been 
out of water for some time and were thereby dry. The lower surface is dull yellowish, but 
the upper side is reddish yellow becoming rather bright at the ends of the rays, but deep 
and dusky near center of disk. These individuals are about the same size as Koehler’s Aru 
Island specimen and his photographs would do fairly well for either of them except that the 
abactinal distal tubercles are less crowded in the Torres Strait specimens. One measures 
140 mm across the aboral side (7.e., R=87 mm., r=53) while the other is 152 mm. across 
(R =96 mm., r=56); R=1.6—1.7r. Koehler’s measurements (taken orally) indicate that 
his specimens had R =2r, but measurements of his photograph of the abactinal surface 
show R =1.75r. 
Our second record of Anthenea was a young specimen, 75 mm. across in life, which 
I found September 15, on Madge Reef, Thursday Island, under a slab of rock, at low tide. 
Its beautiful coloration was a striking contrast to the dingy appearance of most museum 
Antheneas and Mr. Grosse’s accurate drawing, made at once from life (pl. 6, fig. 1) records 
it splendidly. The lower surface was creamy white with the valves of many of the large 
pedicellariz (but not all) deep grass-green. We found no Antheneas at Mer. 
OREASTERID£E. 
Oreaster gracilis. 
Oreaster gracilis Liitken. 1871. Vid. Med., p. 260, 264. 
Pentaceros callimorphus Sladen. 1889. Challenger Ast., p. 347. 
Pentaceros rouxi Koehler. 1910. Ast. et Oph. des iles Aru et Kei, p. 272, pl. xvii, figs. 1, 2. 
Pentaceros mertoni Koehler. 1910. Op. cit., p. 275. 
Although we did not meet with this species in Torres Strait, material in the Museum 
of Comparative Zodlogy, in the Australian Museum at Sydney, and in the Western Aus- 
tralian Museum at Perth has enabled me to reach some very definite conclusions as to its 
status. There are 3 specimens in the Museum of Comparative Zoélogy, a small one with 
R=183 mm. from an unknown locality, and 2 large ones, R =200-235 mm., from Warrior 
Reef, Torres Strait. In the Australian Museum is a specimen from the coast of southern 
Queensland (lat. 24° S.), while the specimen at Perth is supposed to be from somewhere 
on the coast of West Australia. 
The small specimen in the Museum of Comparative Zodlogy was identified and labeled 
by Perrier and so far as I can see is certainly Liitken’s species. This specimen answers 
so well to Koehler’s (1910) description and figures of his supposedly new species rouxi that 
the slight differences detectable are certainly due to age, plus some individual diversity 
perhaps. Koehler states that he has compared his specimens of rouzi with a specimen of 
ae me 
