224 BULLETIN OF THE 



Ophiozona (?) dubia sp. nor. 



Plate II. Figs. 19-21. 



Special Marks. — Two or three small arm-spines. First pair of side arm- 

 plates very large, and meeting outside the mouth-shield. 



Description of an Individual (Station 44). — Diameter of disk 3.5 mm. 

 Length of arm 6.5 mm. Width of same without spines .8 mm. There are 

 about ten short, rounded, bead-like mouth-papilla;, closely set, with one or two at 

 the apex lying below the teeth, which are large and spearhead -shaped. Mouth- 

 shield small, rounded diamond-shape. Side mouth-shields short, rather wide, 

 and meeting within. Under arm-plates small, shield-shape, with an angle in- 

 ward ; longer than broad, with very deep re-entering curves on the lateral 

 sides, so that those towards the end of the arm have but a thin partition be- 

 tween the tentacle-pores. Side arm-plates large, swollen without, meeting 

 broadly above and below, so as to form almost the entire covering of the arm. 

 The first pair are of great size, and meet just outside the mouth-shield, covering 

 nearly the entire lower interbrachial space. Upper arm-plates very small, long 

 diamond-shaped, with the sharp angle inward. Disk five-sided and somewhat 

 swollen, covered with thin, broken, ill-defined, angular plates. Radial shields 

 longer than broad, rudely oval, nearly or quite meeting without, diverging widely 

 within ; wedged between their outer points is a diamond-shaped scale. In the 

 interbrachial space there is one large angular marginal plate. Two or three short, 

 blunt, tapering arm-spines situated midway on the outer edge of the side arm- 

 plates. One round tentacle-scale on the inner edge of the tentacle-pore. Color 

 in alcohol, white. Station 44, 539 fathoms, 1 specimen. 



The great size of the first pair of side arm-plates and the want of definition 

 in the disk-plates seem to make the position of this species in Ophiozona doubt- 

 ful, but I think it best to wait for larger specimens before settling definitely its 

 position. 



Ophiostigma isacanthum Lym. 



Opkiura isacantha Say, Journ. Phil. Acad. V. p. 150. 1825. 

 Ophiostigma monili/orme Ltk., Addit. Ad. Hist. Oph. p. 132. 

 Ophiostigma isacanthum, 111. Catal. Mus. Comp. Zool. p. 103, Figs. 8, 9. 1865. 



Station 10, 37 fathoms, 3 specimens. Station 12, 36 fathoms, 1 specimen. 

 Station 39, 14 fathoms, 1 specimen. 



Ophiactis Miilleri Ltk. 

 Ophiadis Miilleri, Vid. Meddcl. Jan. 1856. p. 12. 



Key West, Fla., 12 -f specimens. Station 11, 37 fathoms, 12 -f specimens, 

 var. quinqueradia. 



Ophionereis reticulata Ltk. 



Ophiura reticulata Say, Journ. Pliil. Acad. V. p. 148. 1825. 

 Ophionereis reticulata, Addit. ad Hist. Oph. Pt. II. p. 110. 1859. 



Station 11, 37 fathoms, 1 specimen. 



