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f* 



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102 



THE OPHIURID^. 



rated, the ventral plates are rather long and narrow. Side arm-plates with 

 outer edge somewhat thick and prominent ; they meet above only in the 

 outer third or half of the arm. Dorsal plates a little wider than long, (some- 

 times a little broader than figured,) rather broadly in contact far out on 

 the arm ; their inner edge is much narrower than the outer, concave, outer 

 edge convex, lateral sides almost straight, or feebly re-enteringly curved ; 

 in the outer part of the arm the dorsal plates are triangular. The first 

 dorsal plate is very short; inside that there are some small, irregular, 

 crowded scales, which cannot be regarded as rudimentary dorsal plates. 

 The arms rather stiff, round; the joints a little nodose. 



Disk covered with stout overlapping scales, among which the primary 

 plates are very conspicuous, making a rosette in the middle of the disk ; 

 they lie close together, not separated by smaller scales, sometimes, however, 

 there are five very small scales between them, joining the central plate. The 

 radial shields are small, only about a third of the radius of the disk, triangu- 

 lar, widely separated through a single series of scales. In the interbrachial 

 spaces there is a rather large marginal plate, which is separated from the 

 radial shields by a series of narrow scales. The under side of the disk is 

 covered by scales similar to the smaller ones on the dorsal side. The geni- 

 tal scale very narrow, but distinct almost in the whole length. The edge 

 of the disk is rather sharp. The genital slits reach to the end of the second 

 arm-joint or to the middle of the third joint, but from that point there is a 

 deep furrow to the margin of the disk, so that it looks as if the genital slits 

 did reach to the margin. No genital papilla. 



Two rather thick, not pointed arm-spines, about as long as an arm-joint ; 

 sometimes the upper one, sometimes the lower one, is a little longer than 

 the other, sometimes they arc equally long. There are spines also on the 

 first two joints. One large round tentacle scale, continuing to the end of 

 the arm; also the inner pores have only one tentacle scale. 



Color in alcohol : white. 



4 



Station 3400, 1322 fathoms; 5 specimens. St. 3413, 1360 fathoms; 



^ 



1 specimen. 



4. Ophiozona alba n. sp. 



Plate VI, Figs. 7-9. 



Diameter of disk, 12 mm.; width of arm close to disk, 2 mm.; length of 

 arms scarcely four times the diameter of disk. Four to six short, close set 



m 



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