MUSEUM OF COMPARATIVE ZOOLOGY. 223 
Ophiochondrus convolutus Lym. 
Ophiochondrus lutus, Bull, Mus. Comp. Zoól, Vol, I. No. 10, p. 328. 1869. Ill. 
Catal. Mus. Comp. Zool. VI. Pl. II. Fig. 7. 
Station 16, 292 fathoms, 2 specimens. Sigsbee, off Havana, 175 fathoms, 
1 specimen. 
Ophiozona tessellata sp. nov. 
Plato III. Figs. 43-45. 
Special Marks, — Three spaced arm-spines, about two thirds as long as an 
arm-joint. Two large tentacle-scales, side by side. A small thick spine or 
spike outside each radial shield. 
Description of an Individual (Station 11). — Diameter of disk8mm. Length 
of arm about 35 mm. Width of arm without spines 1.5 mm. Eleven short, 
close-set, rounded papillo to each mouth-angle, those within being smaller and. 
more pointed. Mouth-shields longer than broad, and wider within than with- 
out, small, hexagonal, with a blunt angle inward, outer side rounded, and 
slightly re-entering curves on the lateral sides ; length to breadth 1.2: 1. 
Side mouth-shields small, much curved, slightly swollen, longer than wide, 
with rounded ends inward, where they just meet. Under arm-plates four- 
sided, much wider without than within; having the outer side eurved and 
lateral sides re-enteringly curved, Side arm-plates small and lowest at their 
outer edge, meeting neither below nor above, where they are separated by 
smooth, slightly swollen, quadrangular upper arm-plates, having a curved outer 
edge wider than the inner one. Disk thin and round, covered with small, 
somewhat swollen plates, whereof six primaries ‘in a central rosette are con- 
spicuous by their larger size ; in each interbrachial space there is a radiating 
row of three differently shaped plates. Radial shields of a rude egg-shape, with 
the small end inward ; separated their whole length by a single row of plates, 
whereof the innermost is nearly as large as à primary. On the outer edge of 
each radial shield are two narrow plates, on which stands a short, blunt, rounded 
spine. Genital opening extending nearly to margin of disk ; the rest of the 
lower interbrachial space outside the mouth-shield is occupied by small irregu- 
larly shaped plates, Three short tapering arm-spines, evenly spaced on the 
outer edge of the side arm-plate, and about two thirds as long as an arm-joint. 
Two flat rounded tentacle-scales on the inner edge of each tentacle-pore. 
Color in alcohol, pale straw. 
Station 11, 242 fathoms, 1 specimen. 
This species stands near O. insularia (Bull. Mus. Comp. Zoól V. No. 7, 
p. 127), but is readily distinguished by its two large tentacle-scales and differ- 
ent under arm-plates, and by the little spine outside the radial shield, 
Ophiozona nivea ۰ 
Ophiozona nivea, T11. Catal. Mus. Comp. Zoàl, No, VIII. Pt. II. p. 9, Figs. 85, 86. 1875. 
Station 16, 292 fathoms, 1 specimen. Station 21, 287 fathoms, 3 specimens. 
Sigsbee, off Havana, 177 fathoms, 1 specimen. Sigsbee, off Havana, 242 
fathoms, 2 specimens. 
