OPHIACANTHA STELLATA. 11 



Ophiocoma papillosa sp. nov. 



Special Marks. — Numerous (twenty or thirty) tooth-papillte. One or two 

 scale-like spines overlapping the base of each upper arm-spine. 



Description of an Individual. — Diameter of disk, 10™°". Length of arm, 45°™'. 

 Mouth-papillae small, four on each side. Tooth-papillfe from twenty-two to 

 thirty, crowded, those in centre smallest. Teeth four. Mouth-shields and 

 arm-plates similar to those of 0. Alexandri, except that the upper ai'm-plates 

 are not so regular nor so wide. Disk closely, finely, and evenly granulated, 

 with about seven grains in the length of a mm. ; below, the granulation is less 

 close. Arm-spines four, smooth, tapering, rather slender; lengths, 2, 2, 1.5, 

 1.3. Besides these, there are usually two scale-like spines overlapping each 

 other and the base of the upper arm-spine. One large tentacle-scale. Ten- 

 tacles, in alcohol, purj^le and set with many papilliB, while those of 0. Alex- 

 andri are nearly or quite smooth. 



Color, in alcohol, pale brown. 



Hassler Expedition ; Santa Barbara, California, 22 fathoms. A young one 

 fi'om the same locality had a disk of 4'°"'. It had already fifteen tooth-pa- 

 pillae, while the large specimens of 0. Alexandri have only nine ; and there 

 were to be seen the supplementary scale-like arm-spines. 



0. papillosa belongs with 0. pumila, 0. Valencice, and 0. Alexandri, in the 

 division of Ophiocoma having flat arms, one tentacle-scale, and a light structure. 



Ophiacantha stellata ?p- nov. 

 PI. II. f. 16-18. 



Special Marks. — Disk beset above with minute stumps, each with a crown 

 of four or five thorns. A strong stricture between the joints of the arm. 

 Upper arm-spines long and needle-like. 



Description of an Individual. — Diameter of disk, 3.5™°'. Width of arm with- 

 out spines, 1.1°™'. Length of arm, 26°™. Mouth-papillae seven, stout, spini- 

 form, not set close together, all similar in form, but the odd one under the 

 teeth larger ; those on each side stand on the jaws. Moiith-shields very wide 

 diamond-shape, with a rounded angle without, and an acute one on either 

 side ; length to breadth, .5 : 1. Side mouth-shields narrow, their outer side 

 curved, meeting within. The first under arm-plate at the corner of the 

 mouth-slit is hexagonal ; the second triangular with an angle inward, bounded 

 without by a curve, and on the sides by re-entering curves ; the third plate, 



