MUSEUM OF COMPARATIVE ZOOLOGY. 285 



Fig. 58. Amphiura incisa, from below; f. 



Fig. 59. " " from above ; |. 



Fig. 60. " " arm-joints, profile; $. 



Fig. 61. " uereis, from below ; *£. 



Fig. 62. " " from above ; *£-. 



Fig. 63. " " arm-joints, profile ; ty. 



Fig. 64. " sp. nov. ? (Station 220), from below; f. 



Fig. 65. " " from above; |. 



Fig. 66. " " arm-joints, profile; $. 



Fig. 67. Ophiochiton tenuispinus, from below; \. 



Fig. 68. " " from above; f. 



Fig. 69. " " arm-joints, profile ; f. 



Fig. 70. Ophiacantha Bairdi from below ; \. 



Fig. 71. " " from above; \. 



Fig. 72. " " arm-joints, profile ; \. 



Fig. 73. " Bartletti, from below ; f . 



Fig. 74. " " from above ; \ . 



Fig. 75. " " arm-joints, profile ; f. 



Fig. 76. " cervicornis, from below ; f . 



Fig. 77. " " from above ; f . 



Fig. 78. " " arm-joints, profile ; f . 



PLATE VI. 



Fig. 79. Ophiacantha lincolata, from below; \. 



Fig. 80. " " from above ; f . 



Fig. 81. " " arm-joints, profile ; f . 



Fig. 82. " Itfcipellis, from below ; ^. 



Fig. S3. " " whole disk from above, to show the varied cov- 



ering; ^. 



Fig. 84. " " arm-joints, profile ; ty. 



Fig. 85. " scolopendrica, from below; \. 



Fig. 86. " " from above ; \. 



Fig. 87. " " arm-joints, profile ; -|. 



Fig. 88. Ophiothatnnus vicarius ? (young), Station 190, 542 fathoms; -, : ' The 

 entire back of the disk is shown, beset with shafts, each bearing a 

 bunch of three or more sharp, slender thorns. These show the em- 

 bryonic form of the thorny stumps so common in Ophiacantha and 

 allied genera, Only two joints of the short arms are represented. 



Fig. 89. Ophiomitra incisa, from below; % 



Fig. 90. " " arm-joints, profile ; I. 



