ANNOTATED LIST. 153 
SCUTELLID£E. 
Echinodiscus tenuissimus. 
Lobophora tenuissima Agassiz and Desor. 1847. Cat. Rais. Ech., p. 136. 
Echinodiscus tenuissimus Gray. 1855. Cat. Rec. Ech., pt. 1, p. 20. 
Echinodiscus auritus var. tenuissima Déderlein. 1903. Jena. Denkschr., 8, p. 723, pl. Ixv, figs. 4-5. 
This is a well-marked form occurring in the East Indian region from Japan to New 
Guinea. Semon took it near Thursday Island, but Déderlein, who gives admirable photo- 
graphs of two of the specimens, considers them unworthy of specific rank and places them 
as a variety of auritus. While a large series of specimens may justify such a decision, the 
material I have examined has convinced me that auritus and tenuissimus are quite distinct. 
ECHINONEID£E. 
Echinoneus cyclostomus. 
Leske. 1778. Add. ad Klein, p. 109.—Westergren. 1911. Mem. Mus. Comp. Zodl., 39, pls. 1-5. 
This common tropicopolitan species was fairly abundant on the southeastern flat at 
Mer, occupying the same sort of habitat and revealing the same habits as in the West 
Indies. Buried in the sand under rock-fragments, it would usually escape notice if the 
sand were not sifted or otherwise disturbed. Occasionally a small specimen is found cling- 
ing to the under surface of the rock-fragment near its margin. The coloration in life of 
the Murray Island Echinoneus ranged from pale brownish cream-color to deep red, gen- 
erally light red, with the tube-feet red, just like West Indian specimens. The Alert took 
a very small specimen of Echinoneus in Prince of Wales Channel. 
HEMIASTERIDE.. 
Schizaster lacunosus. 
Echinus lacunosus Linné. 1758. Sys. Nat., ed. 10, p. 665. 
Schizaster japonicus A. Agassiz. 1882. Challenger Ech., pl. xxxvi, figs. 8-13. 
Schizaster lacunosus Lovén. 1887. Ech. Linn., p. 168. 
The Challenger took this spatangoid just west of Torres Strait at station 188, so that 
its occurrence there is not surprising, but it was unexpected to find it on so unlikely a spot 
as the Madge Reefs, Thursday Island. No doubt, however, the single bare test found 
there, September 15, 1913, was originally washed up from a muddy bottom somewhere in 
the vicinity. The species seems to be most common in the waters of southern Japan, and 
Thursday Island would seem to be the extreme southern limit of its range. 
SPATANGIDEE. 
Brissus latecarinatus. 
Spatangus brissus var. latecarinatus Leske. 1778. Add. ad Klein, pp. xx, 185. 
Brissus carinatus A. Agassiz. 1873. Rev. Ech., pl. xxi a, figs. 1-3. 
Brissus latecarinatus H. L. Clark. 1917. Mem. Mus. Comp. Zodl., 46, p. 219. 
This species has a notable range, as it is common at Mauritius and also at Panama 
and on the Mexican coast. It is also well known from numerous intervening localities, 
including the Gilbert, Samoan, Hawaiian, and Society Islands. And still it has not yet 
been recorded from the east coast of Africa! We found it common at Erub, in the sand on 
the reef-flat along the south side of the island, but at Mer only two bare tests of small 
individuals were found. It is not easy to understand this, for there was no obvious dif- 
ference in local conditions. Whitelegge (1889) includes this species in the fauna of Port 
Jackson, and Ramsay (1885) says it is common on the coasts of eastern and southern 
Australia. Tenison-Woods (1880) goes even further and says it is ‘common in all extra- 
tropical Australia” (italics mine). If there has been no mistake in identification, this 
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