250 BULLETIN OF THE 



Ophiactis Mtilleri (var. quinqueradia) Ltk. 



Station 142, Flannegan Passage, 27 fathoms. Station 152, St. Kitts, 122 

 fathoms. Station 210, Martinique, 121 fathoms. Station 239, Grenadines, 

 338 fathoms. Station 272, Barbados, 76 fathoms. Station 278, Barbados, 69 

 fathoms. 



Amphiura incisa sp. nov. 



Plate V. Figs. 58-60. 



Special Marte. — Two scale-like papillae on each side of mouth-angle, and 

 a pair at its apex. Two large tentacle-scales. Upper disk-scales thick and 

 irregular and separated by depressions. 



Description of an Individual. — Diameter of disk 7.5 mm. "Width of arm 

 close to disk 1.7 mm. Two wide, scale-like papillae at base of mouth-angle on 

 either side, and a pair of thicker ones at its apex. Four stout squarish teeth ; 

 the lowest one smallest and more rounded than those above. Mouth-shields 

 small, rounded, and with a peak inward ; length to breadth, .7 : .7. Side 

 mouth-shields long and large ; broader without than within, where they meet. 

 First under arm-plate small and rounded ; often partly covered by the outer 

 mouth-papillae. The plates beyond are of a regular narrow shield-shape, hav- 

 ing a straight outer side where they are widest; re-enteringly curved laterals, 

 and an angle within. Side arm-plates fiat, with a low spine-ridge, barely meet- 

 ing above, and scarcely separated below. Upper arm-plates separated ; narrow 

 transverse oval, more than twice as broad as long. Disk rather thick, with 

 an undulating border ; covered above by thick, irregular, somewhat angular 

 scales, which are separated by sunken lines, and have the look of a loose 

 mosaic. Below, the scales are smaller and much more rounded and regular, 

 but are strongly separated. Badial shields small, pear-seed shape, and sepa- 

 rated by a narrow wedge of three scales; length to breadth, 1.5 : 1. Three 

 stout, blunt, rounded arm-spines, about as long as a joint ; the middle one is 

 stoutest and has a microscopically rough surface. Two wide, large tentacle- 

 scales, standing one on the side and one on the under arm-plate. Color in 

 alcohol, pale brown. 



Station 161, near Guadeloupe, 583 fathoms, 2 specimens. 



This species is nearest A. Riisei, from which it is strongly distinguished by 

 separated upper arm-plates and radial shields, and much coarser arm-spines 

 and disk-scales. 



Amphiura nereis sp. nov. 



Plate V. Fig*. 61-63. 



Special Marks. — Five papillae on each side of a mouth-angle. Throe ann- 

 spines. Radial shields small, narrow and separated. A row of minute papilla; 

 along genital scale. 



