8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



Locality. — Smithsonian-Hartford Expedition station 28 ; St. John, 

 Virgin Islands ; coral reef off Lagoon Point, on the west side of Coral 

 Bay; W. L. Schmitt, April 6, 1937. One specimen (type, U.S.N.M. 

 no. E.5559). 



Notes. — This species has heretofore been considered the 6-armed 

 young of Ophiocoma pumila, from which, however, it is quite distinct. 



In a specimen of Ophiocoma pumila from Haiti with the disk 5 mm. 

 in diameter and the 5 arms 28 mm. long, the arms are nearly six times 

 as long as the diameter of the disk instead of only slightly more than 

 three times as long as in Ophiocomella caribbaea. 



The granulation of the disk is rather close, the granules, though 

 somewhat irregularly placed, averaging about their own thickness 

 apart. The granules show much diversity in size and shape, some 

 being twice as thick as others. The smallest granules are approxi- 

 mately spherical; the largest, which are about half again as long as 

 their greatest thickness, are conical with much swollen sides ; most of 

 them are intermediate between these two extremes, with more or less 

 broadly rounded ends. 



On the first 3 side arm plates beyond the disk there are 5 arm 

 spines, of which the uppermost is the longest, and the lowest is the 

 shortest. The number then falls to 4, and in the terminal portion of 

 the arm to 3. 



The first and sometimes also the second tentacle pore is provided 

 with 2 tentacle, scales. 



The central portion of the interbrachial areas below is thickly 

 covered with granules. 



OPHIOCOMELLA SCHMITTI, n. sp. 



Plate 1, figs. 3, 4 



Description. — The disk is 3 mm. in diameter, and the arms are about 

 15 mm. long. This species differs from 0. parva from Clipperton 

 Island in having the elongate granules or stout spinelets on the disk 

 longer, three times as long as thick or even longer, and much less 

 numerous, about 30-35 to each square millimeter. The upper arm 

 spines at the bases of the arms are more slender than those of 

 0. parva, and less strongly flattened. 



It differs from 0. caribbaea in having the spinules on the disk- 

 longer, more sharply pointed, and more widely scattered. 



Locality. — Galapagos Islands: Narborough Island; shore; W. L. 

 Schmitt, July 25, 1938. One specimen (type, U.S.N.M. no. E.5638). 



