336 L. E. CEA.AVSHAY. 



Ophiura albida, Forbes. 



At Positions 1, 2, 11, 12, 15, 31, 32, 37, 43, 44, 47, 53, 55, 56, 63. 



A few specimens, or more often single specimens, at each position, 

 excepting several — about ten — at 43. 



Depth, 40-50 fath. 



Ophiura aflBnis, Liitken.* 



At Positions 5 (four), 46 (one). 



Depth, 42-47 fath. 



A single specimen of this species obtained by Dr. Allen on the 

 Bolt Head shell gravel ground in 1895 (1, p. 470) is the only previous 

 record of its occurrence in the English Channel. 



Distribution: Seaham (Hodge, 68), Firth of Clyde, Shetland (very 

 abundant near Balta), Northumberland coast (Norman, 78, 79 ; Hodge, 

 69), Peterhead, Bass Eock, Dogger Bank, Skager Kak (Mobius and 

 Biitschli, 77), Christiania Fjord, The Sound (Liitken, 74), S.W. of 

 Ireland (Haddon, 7), Lesina, Piagusa (Heller, 67), S.E. of Long Island (?) 

 (Leyman, 76). 



Vertical Distribution, 6-294 fath. 



AMPHIUPJDAE. 

 Ophiactis balli (Thompson). 



Eecorded from 33 positions in the following proportions : — 



From one to five specimens at Positions 1, 5, 7, 40, 47, 53. 



A few or several specimens at Positions 6, 8, 10, 11, 12, 16, 18, 32, 

 33, 34, 43, 44, 45, 56, 59, 62, 80. 



Many, or common at Positions 3, 14, 38, 49, 55. 



Very common or abundant at Positions 9, 13, 15, 70. 



Depth, 40-51 fath. 



While these terms serve as a rough approximation to the pro- 

 portionate distribution of the species, it must be added that they 

 probably in many cases tend to show an under-estimate of actual 

 numbers, and with the exception of the fine sandy ground covered by 

 the hauls 1-4, it might be nearly correct to describe the species as 

 usually very common and often abundant throughout the whole area. 



OPHIOCOMIDAE. 

 Ophiocoma nigra (0. F. Miiller). 



Eecorded from 41 positions, including the first and the last. 



Depth, 40-52 fath. 



The species was nowhere obtained in large numbers. Many speci- 



* Mr. "W. De Morgan kindly determined this species. 



