MUSEUM OF COMPARATIVE ZOOLOGY, 217 
OPHIURANS AND ASTROPHYTONS. 
OPHIURID Ag, 
Ophiopeza Petersi sp. nov. 
Plate XII. Figs. 22 - 24. 
Special Marks, — Radial shields naked. Mouth-shields wider than long. 
Description of an Individual. — Diameter of disk 9 mm. Length of arm 
about 54 mm. Width close to disk, without spines, 1.8 mm. Mouth-papille from 
sixteen to eighteen to each angle, the three outer being wider and rounded ; 
the next three or four tooth-like aud sharply pointed ; the two at the apex 
shorter with a rounded edge. Mouth-shields large, triangular, with a blunt 
angle inward, and outer edge irregularly curved ; length to breadth 9 : 2.5 mm. 
Side mouth-shields very small, triangular, oceupying the lateral corners of the 
mouth-shield. First under arm-plate small, broad hexagonal, with sharp angles 
at the lateral corners ; the rest are about as long as wide, and rounded, with the 
outer edges overlapping, and having re-entering curves on the lateral sides, 
where are the tentaclo-seales, Side arm-plates flat, meeting neither above nor 
below, the entire length of the arm, Upper arm-plates slightly swollen, wider 
without than within, having straight lateral sides and the outer side curved. 
Radial shields small, widely separated, longer than broad ; length to breadth 
1.5 :.7. The rest of the disk above and below, as also the space between the 
mouth-shield and tooth-papillw, is covered closely with fine grains, about eigh- 
teen to the length of a mm. ` Five or six short, blunt, tapering arm-spines, evenly 
spaced on the outer edge of side arm-plate ; the four uppermost about .7 mm. 
long, the lowest 1 mm. Toward tip of arm there are only three spines, Two 
flat rounded tentacle-seales to cach pore, whereof the upper one covers the base 
of the lowest arm-spine. Color in alcohol, pale yellow. 
Sigsbee, Lat. 22? 9 15" N., Long. 82° 21! W., 177 fathoms, 3 specimens. 
O. Petersi differs from O. fallas in having naked radial-shields, a coarser 
granulation, fewer arm-spines, and wider mouth-shields ; and from O. ۵۵ 
in having radial shields and the lowest arm-spine longest, while O. Yoldii has 
the middle one longest. The genus stands so close to Pectinura as scarcely 
to be separable, 
Ophioglypha variabilis Lym. 
Ophioglypha variabilis, Bull, Mus. Comp. Zoól. Vol. V. No. 7, p. 85, Pl. III. Figs. 
70, 18, 79. 1878. 
Station 16, 785 fathoms, 1 specimen (Var. T. Station 29, 955 fathoms, 1 
specimen. Station 41, 860 fathoms, 1 specimen. 
I am not able to certainly distinguish these specimens from those of the 
“Challenger” brought from deep water near Amboyna, 
