MUSEUM OF COMPARATIVE ZOOLOGY. 251 



Description of an Individual. — Diameter of disk 4.5 mm. Width of arm 

 without spines 1 mm. Four small scale-like mouth-papillae on each side of 

 an angle, and a pair at the apex. The papilla next the outermost one is com- 

 monly the largest. Mouth-shields about as br,oad as long, rounded, with a 

 slight peak within ; length to breadth, .6 : .6. Side mouth-shields small, and 

 extremely" narrow within, where they barely meet. Their outer ends are 

 club-shaped. First under arm-plate minute and three-cornered ; those be- 

 yond are of a squarish shield-shape, with outer side straight, laterals a little 

 re-enteringly curved, and an obtuse or truncated angle within. Side arm- 

 plates moderately stout, and nearly meeting above and below. Upper arm- 

 plates transverse oval, and about twice as broad as long. Disk rather thick, 

 and covered above and below with small, crowded, overlapping, somewhat 

 irregular scales, of which there are seven or eight in the length of 1 mm. In 

 centre of upper surface are the small, round, widely separated primary plates. 

 Along edge of genital scale is a row of fine papillae. Eadial shields small, nar- 

 row, and separated by bunches of scales ; their length is about .8 mm. Three 

 rather stout, rounded, tapering arm-spines, about as long as a joint ; the middle 

 one being somewhat the longest. One oval tentacle-scale on the side arm- 

 plate, and a smaller and narrower one on the under plate. Color in alcohol, 

 pale gray. 



Station 158, Montserrat, 148 fathoms, 1 specimen. 



This species is perhaps nearest to A. tumida, from which it differs in having 

 much larger mouth-papillee, and a row of papilla? along the genital scale. 



Amphiura duplicata Ltm. 



Station 132, Santa Cruz, 115 fathoms. Station 134, Santa Cruz, 248 fath- 

 oms. Station 136, Santa Cruz, 508 fathoms. Station 145, St. Kitts. 270 

 fathoms. Station 147, St. Kitts, 250 fathoms. Station 148, St. Kitts, 208 fath- 

 oms. Station 151, Nevis, 356 fathoms. Station 154, Montserrat, 298 iathoms. 

 Station 155, Montserrat, 88 fathoms. Station 161, Guadeloupe, 583 fathoms. 

 Station 167, Guadeloupe, 175 fathoms. Station 173, Guadeloupe, 734 fath- 

 oms. Station 176, Dominica, 390 fathoms. Station 185, Dominica, 333 fath- 

 oms. Station 204, Martinique, 476 fathoms. Station 206, Martinique, 170 

 fathoms. Station 210, Martinique, 1!)1 fathoms. Station 216, St. Lucia, 

 154 fathoms. Station 218, St. Lucia, 164 fathoms. Station 220, St. Lucia, 

 116 fathoms. Station 221, St. Lucia, 423 fathoms. Station 227. St. Vin- 

 cent, 573 fathoms. Station 238, Grenadines, 127 fathoms. Station 

 Grenadines, 338 fathoms. Station 241, Grenadines, 163 fathoms. Station 

 260, Grenada, 291 fathoms. Station 261, Grenada, 340 fathoms. Station 264, 

 Grenada, 416 fathoms. Station 272, Barbados, 7ti fathoms. Station 27:'.. 

 Barbados, 103 fathoms. Station 274, Barbados, 209 fathoms. Station 27.".. 

 Barbados, 218 lath. mis. Station 276, Barbados, 94 fathoms. Station 290, Bar- 

 bados, 73 fathoms. 



