MUSEUM OF COMPARATIVE ZOOLOGY, 149 
Ophiacantha vivipara ۰ 
Ophiacantha vivipara, Tvinne Nya Ophiurid. Of. Kong. Akad. p. 471. 1870, 
Marion Island, 50 — 75 fathoms, 12 + specimens. The following three places 
in the Kerguelen Islands: Christmas Harbor, 120 fathoms, 12 + specimens ; 
Balfour Bay, 20-60 fathoms, 1 specimen; Royal Sound, 25 fathoms, 12 + 
specimens, Station 151, 75 fathoms, 8 specimens, Station 313, 55 fathoms, 
12-- specimens. Station 314, 70 fathoms, 1 specimen. Station 320, 600 
fathoms, 7 specimens. 
Ophiacantha bidentata Lox. MS. 
Asterias bidentata Rurrz., Dissertatio, p. 33. 1805. 
Ophiacantha spinulosa MÜ LL. and Troson., Syst. Asterid. p. 107. 1842. 
Dr. Ljungman showed me at Stockholm the original of Retzius, which is, 
without question, this species, 
Station 45, 1240 fathoms, 8 specimens. Station 46, 1350 fathoms, 12 -++ 
specimens. Station 49, 83 fathoms, 6 specimens, 
OPHIOTHAMNUS Lym. 
Ophiothamnus remotus sp. nov. 
Plate VIII. Figs. 201 - 203. 
Special Marks. — Disk-seales coarse and angular, Side mouth-shield very 
large, and meeting broadly within. Very few short spines on disk, 
Description of an Individual (Station 142). — Diameter of disk 3.3 mm. 
Length of arm 11 mm. Width of arm without spines 8 mm. Seven flat 
close-set_mouth-papillie ; the odd one, at the apex, being short spearhead- 
shaped, the rest squarish, — Mouth-shields small, three-sided, with a point 
inward, and the outer corners rounded ; length to breadth .4: .3. Side 
mouth-shields very wide and large, meeting broadly within, and enveloping 
the mouth-shield on all sides but one. First under arm-plate small and 
wedge-shaped, with inner end rounded ; the rest are pentagonal, with an ob- 
tuse angle inward, and outer corners somewhat rounded ; the second plate is 
larger than those beyond. Side arm-plates meeting broadly above and below, 
constricted within, swelling outward into a thickened spine-ridge. Upper 
arm-plates wider than long, irregular oval, with a slight peak within. Disk 
rather thick, covered above with coarse angular scales, whereof there are but 
two radiating rows in each interbrachial space ; radial shields wide pear-seed 
shape, with a rounded angle inward, joined their whole length, except their 
inner ends, which are separated by a wedge-seale ; interbrachial spaces below 
with a marginal constriction, and usually covered by four large rounded scales ; 
there are a few short smooth disk-spines. Seven slender, translucent, sharp, not 
