OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 127 



on the slenderness of the arms, which are provided with short 

 spines, to separate 0. oedidlsca from O. normani and O. relictus. 

 Evidently the two authors have completely misunderstood the char- 

 acters of O. relictus. I therefore continue to consider 0. oedidi-sca 

 as a synonym of O. relictus. 



OPHIOPHTHALMUS SUSPECTUS, new species. 



Plate 6, figs. 1, 2. 



Locality. Not given. 



One specimen (Cat. No. 41164, U.S.N.M.). 



Description. The disk is 8 mm. in diameter, and the arms are 

 45 mm. long. 



The disk is rounded, and notched in the interradial spaces. It 

 is rather thick and the dorsal surface is depressed in the central 

 region. This surface is covered with small, rather crowded, thin 

 and transparent imbricated plates, the contours of which are only 

 slightly evident; each of them carries a broad and very short club 

 spine, scarcely longer than broad, which rapidly expands into a 

 large convex head ; it would be quite as exact to say that these plates 

 bear slightly pediculate globules. The rounded surface of these 

 club spines or globules is very rugose, and under the microscope it 

 is seen to be provided with short and closely crowded spinules. 

 The globules themselves are very close to each other, and in con- 

 tact in the central region of the disk; they are less closely crowded, 

 and also a little larger, toward the periphery of the disk and be- 

 tween the radial shields; in these regions the plates which carry 

 the globules are themselves larger and their outlines are more dis- 

 tinct. The radial shields are large, irregularly triangular in shape, 

 with the angles and the borders rounded, scarcely longer than 

 broad; they are in contact throughout almost their entire length, 

 which almost equals a third of the radius of the disk. In the inter- 

 radial spaces the investment of plates does not extend quite to the 

 periphery of the disk, leaving naked a marginal region which is 

 covered only by a membraneous integument showing here and 

 there a small calcified nodule. 



The ventral surface of the disk bears only extremely thin and 

 transparent plates which do not even form a continuous covering. 

 The genital slits are rather broad, but the genital plates are only 

 slightly developed. 



The radial shields are rather small and short, though very broad, 

 at least three times as broad as long; they show an obtuse though 

 rather projecting angle, two slightly concave sides, and a convex 

 distal border, of which the middle is swollen into a slightly project- 

 ing lobe. The adoral plates are short, rather broad, especially out- 

 wardly, and about twice as long as broad; they do not give off any 



