40 BULLETIN OF THE 



Ophiactis poa sp. nov. 



Plate XIII. Figs. 356-358. 



Special Marks, — Disk-scales coarse and thick, with large radial shields ; no 

 spines except a few near the margin. Four rather long and slender arm-spines, 

 the upper one longest. Two niouth-papillse on each side. 



Description of an Individual (off Tristan d'Acunha). — Diameter of disk 

 5 mm. Length of arm about 30 mm. Width of arm near disk 1 mm. On 

 each side of the short narrow mouth-angle are two rather large, squarish, flat 

 papillae, of which the outer one is broader ; at the apex is usually a very small 

 heart-shaped papilla, similar in shape to the larger teeth above it. -Mouth- 

 shields much wider than long, of a rounded transverse heart-shape ; the inner 

 sides a little re-enteringly curved. Side mouth-shields of nearly equal width, 

 meeting broadly within. Under arm-plates wide shield-shaped, bounded 

 without by a broad curve, within by an obtuse or truncated angle, and on the 

 lateral sides by re-entering curves. Side arm-plates nearly meeting above and 

 below, not very wide, but projecting in a well-marked spine-crest. Upper 

 arm-plates broader than long, fan-shaped with an obtuse angle inward. Disk 

 covered with coarse, overlapping scales ; those below regular and smaller, about 

 4 in the length of 1 mm . ; those above much larger and more irregular ; in the 

 centre an irregular rosette of large, rounded plates, and in each interbrachial 

 space about three radiating rows of elongated scales. The disk margin is 

 sparsely set with small peg-like spines. Radial shields large, of an angular pear- 

 seed shape, separated wholly by a narrow wedge of two or three scales ; length 

 to breadth 1.5 : 1. Four slender, cylindrical tapering arm-spines, the upper- 

 most longest ; lengths to that of an under arm-plate 1.2, .8, .8, .8 : .5. One 

 large, oval tentacle-scale. Color in alcohol, pale gray. 



Oft' Tristan d'Acunha, 1,000 fathoms, 2 specimens. Off Tristan d'Acunha, 

 500 fathoms, 10 specimens. Both Station 135. 



Ophiactis eanotia sp. nov. 



Plate XIII. Figs. 353-355. 



Special Marks. — Disk-scales larger in centre, where primary plates may be 

 distinguished in a rosette ; no spines, or only an occasional minute one on the 

 margin. Three or four rather long and tapering arm-spines. Two mouth-pa- 

 pillae on each side. 



Description of an Individual (Station 73). — Diameter of disk 5.5 mm. 

 Length of arm about 17 mm. Width of arm near disk 1.8 mm. Two flat, 

 rather large, squarish mouth-papillae on each side of the narrow mouth-angle, 

 and one at the apex, similar in form to the teeth, which are broad heart-shape 

 with a peak within. Mouth-shields wider than long, broad heart-shaped with 

 a rounded angle within, or wide transverse, rounded diamond-shaped. Side 

 mouth-shields rather narrow, of about equal width, meeting fully within. First 

 under arm-plate small and wider within than without ; those beyond are wide 

 shield-shaped, bounded without by a curve, on the lateral sides by re-entering 



