MUSEUM OF COMPARATIVE ZOOLOGY. 149 



Ophiacantha vivipara Ljn, 



Ojjhiacantlia vivipara, Tvanne Nya Opliiurid, 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 -f- specimens. Station 314, 70 fathoms, 1 specimen. Station 320, 600 

 fathoms, 7 specimens. 



Ophiacantha bidentata Ljn. MS. 



Asterias bidentata Retz., Dissertatio, p. 33. 1805. 



Ophiacantlut spinulosa Mull, and Trosch., 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 Ltm. 

 Ophiothamnus remotus sp. nov. 



Plate YIII. Fiss. SOI - S03. 



Special Marks. — Disk-scales 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-papillae ; 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 comers 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 w'ith 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-scale ; 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 



