STAUEOCALYPTÜS ENTACANTHUS. 191 



most cases smooth but occasionally slightly granular ; the compara- 

 tively large size attained by gastral hexactins ; the great abun- 

 dance of hexactinose oxyhexasters ; and the wide range (120 /<- 

 400 ijt) of variation in the size of discoctasters as well as their 

 large maximum size. (For a comparative talkie of the main 

 distinctive features of this species and of certain others, see the 

 foot-note on pp. 166-167). 



STAUROCALYPTUS ENTACANTHUS noy. sp. 



PL XIV., figs. 15, 18. 



Staui'ocalyptus Doiclingi in part. Ijima, '97, p. 00 ; '98, p. 53. 



The specimen which I now make the type of this new species 

 is another that was at first placed by me under S. dowlingi. Its 

 characters were therefore taken into account in drawing up the 

 diagnosis of that species given by me in '97. 



The said specimen (PL XIY., fig. 15. S. C. M. No. 242) 

 comes from the north of Onigase and from a depth of between 

 429 and 572 meters. It is a large piece of wall torn from the 

 superior end of an individual, which when entire must have had 

 a sac-like or vase-like shape with a diameter of nearly a foot. 

 It exhibits a part of the natural oscular edge, which is sharply 

 angular but not thin. The marginal zone, is divided into a 

 number of broad triangular flaps, folded outwards and backwards 

 and even partially rolled up, so that in places the oscular edge 

 is in touch wdth the dermal surface of the lateral wall. Between 



