MUSEUM OF COMPARATIVE ZOOLOGY. 267 



near disk 2 mm. Five crowded mouth-papillse on either side of an angle, 

 whereof the four innermost are small and narrow, while the outermost one is 

 as wide as three of them. Four teeth, of which the upper and the under one 

 are more or less pointed, while the other two are wide with a curved cutting 

 edcfe. Mouth-shields of a wide diamond-shape with rounded angles; length to 

 breadth, 1.5 : 1.5. Side mouth-shields long and tapering inward to a point; 

 their outer end widened so as to embrace a corner of the mouth-shield. Under 

 arm-plates much wider than long, of a broad shield-shape, with a wide curve 

 without, re-entering curves on the sides, and a very obtuse angle within. Side 

 arm-plates not prominent, nearly or quite meeting above and below. Upper 

 arm-plates much wider than long, transverse diamond-shape with lateral angles 

 sharp. Disk covered with smooth flat imbricated scales, the largest 1 mm. 

 long; between the radial shields, in interbrachial space, there are four or five 

 radiating rows. Along margin of disk is an irregular line of granules. Radial 

 shields rounded, a little swollen, about as broad as long, closely joined; length 

 to breadth, 1.5 : 1.5. Genital openings large and extending from mouth-shield 

 to margin of disk. Five arm-spines, whereof the lowest is shortest, about as 

 long as one arm-joint, and blunt and flattened; the two uppermost are also 

 flattened, but sharp, and about as long as two joints; the two middle ones are, 

 near base of arm, much flattened, and are widened at their tip like a spatula 

 and microscopically serrated on their edges: farther out, they are simply wide 

 and flat. Two oval, rather large tentacle-scales to each pore. Color in alco- 

 hol, gray. 



" Challenger " Expedition, Station 219, 1° 50' S., 146° 42' E., 150 fathoms, 

 mud. One specimen. 



Ophiothrix Suensonii Ltk. 



Station 127, Santa Cruz, 38 fathoms. Station 142, Flannegan Passage, 27 

 fathoms. Station 152, St. Kitts, 122 fathoms. Station 155, Montserrat, 88 

 fathoms. Station 156, Montserrat, 88 fathoms. Station 157, Montserrat, 

 120 fathoms. Station 189, Dominica, 84-120 fathoms. Station 247, Gre- 

 nada, 170 fathoms. Station 249, Grenada, 262 fathoms. Station 262, Gre- 

 nada, 92 fathoms. Station 269, St. Vincent, 124 fathoms. Station 272, 

 Barbados, 76 fathoms. Station 276, Barbados, 94 fathoms. Station 277, Bar- 

 bados, 106 fathoms. Station 285, Barbados, 13-40 fathoms. Station 286, 

 Barbados, 7-45 fathoms. Station 290, Barbados, 73 fathoms. Station 292, 

 Barbados, 56 fathoms. Station 293, Barbados, 82 fathoms. Station 294, Bar- 

 bados, 137 fathoms. Station 298, Barbados, 120 fathoms. 



Ophiothrix angulata Ayres. 



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

 fathoms. Station 155, Montserrat, 88 fathoms. Station 156, Montserrat, 88 

 fathoms. Station 177, Dominica, 118 fathoms. Station 203, Martinique, 



