364 A. M Verrill — North American Ophiuroidea. 



larger than the rest, are strongly convex or pustular, and often 

 white. Five somewhat smaller convex interradials may usually be 

 distinguished by their size ; the other plates and scales are of vari- 

 ous sizes, the larger ones convex or somewhat verruciform, while 

 the small ones are nearly flat. A radial band of small scales extends 

 continuously between the radial shields and out over the upper side 

 of the arms, becoming flat, angular, and closely crowded on the arms, 

 so as to form a fine mosaic. 



Radial shields long-ovate, widely separated; the surface is evenly 

 covered with fine hemispherical elevations ; the side arm-plates are 

 ornamented in a similar manner. Along each side of the arms, 

 above, there is a row of elevated, verruciform or almost hemispheri- 

 cal plates, alternating with the side arm-plates ; part of these are 

 usually pure white, alternating with others that are deep brown. 

 Under arm-plates well developed, trapezoidal, with acute outer 

 angles, and with a rather deep median emargination or notch in the 

 distal edge, except on six or seven basal ones; close to the base they 

 are larger than broad, but farther out they become broader than 

 long. Arm-spines generally two, small, short, nearly equal, obtuse, 

 becoming longer and more slender distally. Tentacle-scale rather 

 large, ovate, obtuse. Oral shield large, often white, somewhat 

 " spade-shaped " with the outer end and sides, evenly rounded, the 

 inner edges concave, the median and inner lateral angles acute; they 

 vary considerably in different specimens. Adoral shields swollen, 

 somewhat crescent-shaped or pear-seed-shaped, with the acute inner 

 ends touching. Oral papillae about five, angular, crowded in a close 

 series, the outer ones larger. Genital openings small, like an angu- 

 lar pore, between two angular plates, at the outer edge of the oral 

 shields. 



Color reddish or yellowish brown, spotted and blotched with clear 

 white in various ways, so as to closely imitate the color and appear- 

 ance of certain species of Gorgonella to which it habituallj' clings. 

 Usually there are rows of white verruciform plates along the arms 

 on the upper side, resembling in size and color the verrucae of the 

 coral, which has a brown ground-color, like that of the Hemieuryale. 

 Part of the tubercular plates of the disk, part of the oral shields, 

 part of the spines, and part of the side arm-plates are also usually 

 white. 



Common in water of moderate depth throughout the West Indies 

 wherever the Gorgonella lives. Specimens from off Barbadoes have 

 been in the Yale Museum many years. Taken by the Blake Expedi- 

 tion in 74 to 180 fathoms. 



