124: BULLETIN OF THE 



Ophioceramis (?) clausa. 



Plate VI. Figs. 161 - 163. 



Special Marks. — Four arm-spines, the two upper slender and tapering, the 

 two lower stout and blunt. A great marginal scale, which occupies also most 

 of the lower interbrachial space. 



Description of an Individual (Station 170). — Diameter of disk 4 mm. 

 Length of arm about 18 mm. Width of arm without spines 1.2 mm. Three 

 short, stout, pointed mouth-papilla;, well separated on each side, with one 

 larger and spearhead -shaped at the apex of angle. Mouth-shields broader 

 than long, transverse diamond-shape, with outer angle indented ; length to 

 breadth .6:1. Side mouth-shields very large and wide, somewhat longer 

 than wide, square without, meeting broadly within, and there forming a deep 

 angle. First under arm-plate broader than long, rounded ; the rest are widely 

 separated, twice as broad as long, with outer edge nearly straight, a very 

 obtuse angle or weak curve within, and a small re-entering curve on the 

 lateral sides. Side arm-plates stout, flaring a little outward where they form 

 the spine-ridge, meeting broadly above and below. Upper arm-plates broader 

 than long, wide fan-shape with an angle inward, somewhat swollen, making 

 the arm high and rounded. Disk round and flat, covered with thin, flat, angular 

 scales arranged symmetrically ; central primary plate pentagonal, surrounded 

 by five others rounded hexagonal and somewhat smaller; interbrachial spaces 

 filled by three large scales, the two inner ones four-sided, the outer one rounded 

 and lying on the margin, showing little above, but beneath occupying the 

 whole interbrachial space except -two small scales outside the mouth-shield. 

 Kadial shields regular, longer than broad, wide without, coming by curved 

 sides to a point within, where they are separated by a small triangular scale, 

 but are joined for the rest of their length ; they, as well as the other disk- 

 scales, bear a few microscopic tubercles. Four arm-spines ; the two upper thin 

 and tapering, and nearly as long as an arm-joint ; the two lower shorter, 

 stouter, and more blunt ; towards tip of arm there are three, the upper long 

 and slender, as long as two joints ; the second similar, but shorter ; and the 

 lowest very stout and somewhat curved. One -very small rounded tentacle- 

 scale, on the first two pairs of tentacle-pores ; beypnd there are two. Color in 

 alcohol, pale brown. 



Station 170, G30 fathoms, 1 specimen, 



Ophioceramis (?) obstricta pp. nov. 



Plate VI. Figg. 164 • 166. 



Special Marks. — Five short, nearly equal, blunt, tapering arm-spines. 

 Radial shields separated in the brachial spaces, but touching in the inter- 

 brachial. 



Description of an Individual (Station 192). — Diameter of disk 4 mm. 



