2^7 



3. Ophiura trimeni. (PI. I., Figs. 3 and 4). 



No arm comb, the radial shields of moderate size, separate and 

 diverging ; scales of disc small, but not minute ; three arm 

 spines, which break off very easily ; the uppermost the longest, 

 and about as long as an arm joint ; pores at base of arm 

 large and guarded by about six scales ; more distally both pores 

 and scales seem to disappear altogether ; the side arm plates are 

 of great size, and cause the almost total disappearance of the 

 lowermost plates. Colour in alconol whitish. 



Diameter of disc, 8 ; 7 ; 9. 



^Length of arm 21 (ca) ; 28 ; 25. 



Breadth of arm at base, ■2'2; 2*5 ; 2"5. 



The specimens were obtained as follows : — 



* Xo specimen had an unbroken arm. 



