338 



s. GOTO 



" Colour in tlie frosli state s<almon-recl. 



" Laccadive Sea, off Minuikoy, 1200 fathoms, coral and Globigerlna-ooze.' 



Ilippasteria iinperinlis, n. sp. 



(PL xn, figs. 178-193.) 



This is a very large species, unlike any that have been 

 described so far. The body is flat and lightly pentaradiate, with 

 the marginal border of the disk nearly straight and the arms 

 triangular, rounded and slightly turned upwards at the tip, so that 

 the space that would be enclosed by a line joining the tips of 

 adjacent arms and the margin of the body would form a re- 

 gular trapezoid. The actinal surface is as a whole nearly plane, 

 but the interradial areas are decidedly hollow. The abactinal 

 side is also plane as a whole, but there is a well marked cir- 

 cular elevation at the centre of the disk, from which a carinal 

 ridge extends to the tip of each arm, while the interradial areas 

 are slightly depressed (PL Xtl, fig. 178, 179). The granulations of 

 the body are coarse, and there are numerous pedicellariœ on the 

 actinal and abactinal sides as well as on the marginal plates, so 

 that the whole body presents a rather rough appearance. I have 

 only a single specimen which measures as follows : 



Superomarginals. — The superomarginals are very large and 

 are nearly flush with the inferomarginals. Each plate has a 



