262 BULLETIN OF THE 



Station 148, St. Kitts, 208 fathoms. Station 183, Dominica, 250 fathoms. 

 Station 238, Grenadines, 127 fathoms. Station 239, Grenadines, 338 fath- 

 oms. Station 269, St. Vincent, 124 fathoms. Station 281, Barbados, 288 

 fathoms. Station 291, Barbados, 200 fathoms. 



Ophiacantha echinxolata Lym. 



Sometimes the radial shields cannot be seen, as in the figure (Bull. M. C. Z., 

 V. 9, PI. I. Figs. 7-9), but are quite hidden by the short disk-spines. 



Station 153, Montserrat, 303 fathoms. Station 174, Guadeloupe, 878 fath- 

 oms. Station 185, Dominica, 333 fathoms. Station 205, Martinique, 334 

 fathoms. Station 227, St. Vincent, 573 fathoms. Station 260, Grenada, 291 

 fathoms. 



Ophiacantha pentacrinus Ltk. 



A large specimen with a disk of 6 mm. had still only six arm-spines, and 

 in general answered to the description (0, meridionalis, Bull. M. C. Z., I. 10, 

 p. 324), except that there were sometimes four, instead of three, mouth-papillaj 

 on a side, and the disk-crotchets were somewhat stouter. 



Station 136, Santa Cruz, 508 fathoms. Station 137, Santa Cruz, 625 fath- 

 oms. Station 155, Montserrat, 88 fathoms. Station 167, Guadeloupe, 175 

 fathoms. Station 176, Dominica, 390 fathoms Station 185, Dominica, 333 

 fathoms. Station 188, Dominica, 372 fathoms. Station 195, Martinique, 

 502| fathoms. Station 204, Martinique, 476 fathoms. Station 205, Marti- 

 nique, 334 fathoms. Station 206, Martinique, 170 fathoms. Station 211, 

 Martinique, 357 fathoms. Station 212, Martinique, 317 fathoms. Station 

 221, St. Lucia, 423 fathoms. Station 222, St. Lucia, 422 fathoms. Station 

 226, St. Vincent, 424 fathoms. Station 227, St. Vincent, 573 fathoms. Sta- 

 tion 230, St. Vincent, 464 fathoms. Station 260, Grenada, 291 fathoms. 

 Station 280, Barbados, 221 fathoms. Station 288, Barbados, 399 fathoms. 

 Station 291, Barbados, 200 fathoms. Station 299, Barbados, 140 fathoms. Sta- 

 tion 320, 32° 33' 15" N., 77° 30' 10" W., 257 fathoms. 



0. cosmica is near this species, but has seldom less than eight arm-spines, 

 Avhile the disk-crotchets are coarser with a crown of more numerous thorns, 

 and the side arm-plates are less prominent. 



Ophiacantha stellata Lym. 



This species differs from the two last-named in having shorter and more 

 thorny arm-spines (indeed, the upper arm-spines, beyond the basal joints, are 

 often scarcely longer than the lower) ; in larger tipper arm-plates, and more 

 strongly knotted arms ; and in coarser and more thorny stumps on the disk. 



Station 155, Montserrat, 88 fathoms. Station 177, Dominica, 118 fathoms. 

 Station 233, St. Vincent, 174 Itithoms. Station 249, Grenada, 262 fathoms. 

 Station 253, Grenada, 92 fathoms. Station 262, Grenada, 92 fathoms. Station 



