1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 295 



tally the outer end becomes rounded and tbe form somewhat wedge- 

 sbape. 



Station 2o73, off George's Bank, in 1,742 fathoms (No. 12026, U. S. N. 

 M.), 23 specimens, U. S. F. C, 1885. 



OPHIOGLYI'HA BLLLATA, T h o ui s o n . 



OphtoijUjpha huUatu, Wyv. Thomson, Nature, viii, p. 400, 1873; Voyage of the 

 Challenger, Atlantic, i, p. 400, fig. 7. — Lyman, Rep., i Ophiuroidea, Voyage 

 of the Challenger, v, p. 57, pi. 38, figs. 14 to 17, 1882.— Verrill, Rep. U. S. 

 Com'r Fish and Fisheries, xi, p. 543, 1885. 



The large series of specimens of this species taken by the Albatross 

 shows that it is much more variable, especially in respect to the disk- 

 scales, than Mr. Lyman's description indicates. The disk is generally 

 very convex, but sometimes it is nearly flat. The disk-scales and radial 

 scales are usually strongly conve.>: and rough, with small granulations, 

 but sometimes, in specimens from the same lot, they are almost or quite 

 flat and nearly smooth, and in our large examples the large disk-scales 

 and the radial shields are even concave in the middle. Usually the 

 central and Ave radial primary plates form a regular and prominent 

 rosette of large polygonal scales, without any small ones between them, 

 but in some specimens several small, angular scales are interpolated 

 between the large primary ones in various ways, and the latter are 

 more or less obscured, so as to appear smaller and rounder. In the 

 small specimens, with the disk 4 to 8 mm. in diameter, the six central 

 plates are always conspicuous, thick and convex, and rise above the 

 rest of the disk. There is usually a single, large, inferior, interradial 

 plate, outside the mouth plates, but it is often divided in large speci- 

 mens. The mouth plates are pretty constant in form. This species was 

 taken at several stations in 1,008 to 2,G20 fathoms. 



ASTROSCHEMA CLAVIGERA, new species. 



Disk small, with prominent radial shields extending to the center; the 

 whole dorsal surface and that of the arms is covered with small smooth 

 granules. Under surface of the arms and sometimes of the disk, nearly 

 destitute of granules. First two tentacle pores without scales: third 

 and sometimes the fourth with one spiniform; those beyond the fifth 

 and sometimes the fourth with two spines, of which the inner becomes 

 large and long, clavate, and rough with spinulcs distally. 



The disk in the type specimen is concave in the middle, with strongly 

 incurved interbrachial sjjaces, and large, prominent, rounded ribs. Di- 

 ameter of disk, 8 mm.; breadth of arms at base, 3 mm. The arms are 

 very long, and closely coiled around the branches of a gorgonian. 

 Toward the base they are moderately stout, about as broad as high, 

 then taper gradually to very slender tips; each of the joints is marked 

 by an obtuse, elevated ridge, more or less divided dorsally into two 

 prominences by a longitudinal depression along the median line. The 



