CLARK: JAPANESE AND EAST INDIAN ECHINODERMS. 297 



The re-discovery of this lost species, which Lyman was inclined to regard as 

 identical with 0. wendtii, while he held both to be of doubtful validity, is a matter 

 of real interest. Koehler (1905, "Siboga" Oph., pt. 2, p. 63; 1907, Bull. Sci. 

 France et Belg., 41, p. 327) has ably defended the validity of wendtii, while the 

 specimens which Mr. Barbour has brought from Amboina show that schoenleinii 

 is equally recognizable. It may be distinguished at once from erinaceus, which it 

 superficially reseuibles closely, by the presence of a single large tentacle scale on 

 all the arm-joints beyond the disc ; there are usually two on the first arm-joint, 

 sometimes on one side of the second, and very rarely on one side of the third or 

 fourth. The arm-spines are shorter and the oral shields a trifle wider than in 

 specimens of erinaceus of the same size. The color also appears to be darker and 

 without any trace of reddish. From wendtii, these specimens are easily separated 

 by the short, broad oral shields, nearly as wide at the inner as at the outer end, 

 by the basal under arm-plates which are wider than long, and by the absence of 

 long club-shaped dorsal arm-spines on every third or fourth joint; the color also 

 appears to be a deeper, more blackish brown, and more uniformly dark on the 

 arms. In spite of the fact that it seems to be not only possible but quite easy to 

 divide our Museum specimens of Ophiocoma from the East Indies into these 

 various species, I shall not be surprised if more extended observations, carried on 

 at the shore, prove that erinaceus, schoenleinii, scolopendrina, and wendtii are 

 merely intergrading forms of a single variable species. 



Ophiocoma scolopendrina. 



Ophiura scolopendrina Lamarck, 1816. Anim. s. Vert., 2, p. 544. 



Ophiocoma scolopendrina Agassiz, 1835. Mem. Soc. Sci. Neuchatel, 1, p. 192. 



47 specimens. Diameter of disc, 6-22 mm. Color dorsally very variable, 

 ranging from uniform deep purplish brown to light yellowish brown, more or less 

 marked with darker and on the arms finely spotted with white ; but on the ventral 

 side the under arm-plates and oral shields are always more or less clear yellowish. 

 Sorong, New Guinea. — 3 specimens, similar to above. Amboina. Barbour 

 collection. 



Opkiarthrum elegans. 

 Peters, 1851. Monats. K. Akad. Berlin, p. 464. 



1 specimen. Diameter of disc, 12 mm. Color : centre of disc nearly black ; 

 margin of disc, arms, and interbrachial spaces yellowish or whitish finely spotted 

 with brown ; indistinct cross-bands of brown occur on the arms, especially near 

 tip. Sorong, New Guinea. Barbour collection. 



Ophiomastix annulosa. 



Ophiura anmdosa Lamarck, 1816. Anim. s. Vert., 2, p. 543. 

 Ophiomastix annulosa Miiller & Troschel, 1842. Sys. Ast., p. 107. 



8 specimens. Diameter of disc, 12-26 mm. Color brown, beautifully marked 

 with yellowish white, each upper arm-plate sharply outlined therewith ; spines 

 whitish, spotted, or ringed with blackish. Amboina. Barbour collection. 



