282 bulletin: museum of comparative zoology. 



Ophionephthys ecnomiotata. 



Amphiura ecnomiotata H. L. Clark, 1911. Bull. 75 U. S. N. M., p. 148, fig. 59. 

 Ophionephthys ecnomiotata H. L. Clark, 1915. Mem. M. C. Z., 25, p. 239. 



The upper arm-plates of this and the following species are strikingly 

 different from those of the other members of the genus ; their extreme 

 narrowness is probably associated with the large number of arm-spines. 

 A small specimen collected by Prof. E. S. Morse in Tokyo Bay, 

 Japan, differs from the adult holotype in a few details. The maxi- 

 mum number of arm-spines appears to be 8 which might be expected 

 from the small size of the specimen. The disk is little more than 2 mm. 

 across, in its present dried condition, and numerous minute scales 

 are present at the center. This is interesting as indicating that very 

 young specimens may have the disk entirely covered with scales, 

 thus showing that Ophionephthys passes through an Amphiura stage. 

 The present species is known only from the eastern coast of southern 

 Japan. 



Ophionephthys octacantha. 



H. L. Clark, 1915. Mem. M. C. Z., 25, p. 239, pi. 9, fig. 9, 10. 



This species is known only from a single specimen taken at Friday 

 Island, in Torres Strait. It resembles the preceding in many im- 

 portant points but the marked difference in the form of the distal 

 oral papilla is a good distinguishing character. 



Ophionema intricata. 

 Plate 2, fig. 1-3. 

 Liitken, 1869. Add. ad hist. Oph., pt. 3, p. 27 (fig.), 94, 98. 



The rediscovery of this remarkably interesting brittle-star, the 

 only species of the genus, and hitherto known from only a single 

 specimen, was one of the noteworthy results of collecting at Tobago. 

 We found it quite common in the sandy mud in two or three feet of 

 water at Sandy Point, Buccoo Bay, where it occurred with half a 

 dozen species of Ophiocnida, Amphipholis, Ophiophragmus, and 

 Amphiodia. Generally the disks were shed in the process of col- 



