98 MR. J. A. STEWART ON ASTERONYX LOVENI. [Mar. 1 2, 



across; it is covered on its summit with a number of recurved 

 spikelets. The second spine is shghtly compressed towards the sum- 

 mit, where, on its inner margin, it is furnished with a few spikelets 



in a single series. When the animal is alive, a thin membrane covers 

 the whole of the spines, as in other Echinodermata ; but in dried spe- 

 cimens this is scarcely discernible. 



Two series of tentacle-pores run along the sides of the arms — one 

 pore to each joint, placed near to and in aline with the spines. They 

 can be easily traced for 2 inches or so along the length of the arm ; 

 but whether they continue much further it is difficult to say from 

 the dried specimen. Two of these pores occur at the origin of the 

 arms within the calcareous ring surrounding the mouth. 



