STAUEOCALYPTUS ENTACANTHUS. 199 



10), provisionally referred by nie with some degree of hesitation to 

 S. entacmülms. 



Here the principal parenchymal oxydiactins attain a maximnm 

 size of 15 mm. length by 80/^ breadth. Thus they may be longer 

 and decidedl}^ more slender than in the type-specimen. Another 

 appreciable point of difference consists in the more gradual manner 

 of tapering towards both ends which are slender and more or less 

 rousfh-surfaced. 



The oxydiactins protruding from the gastral surface may be 

 20 mm. lono; and 250/^ broad in the middle. Thev are much 

 longer and thicker than the corresponding spicules in the type- 

 specimen. This fjict seems noteworthy especially when the smaller 

 size of the specimen under question is considered. 



Among the derraalia I have found, though exceedingly rarely, 

 regularly developed hexactinic forms. In many of the dermal 

 pentactins the distal i-ay is represented l)y a mere knob. 



The different kinds of hexasters are quite similar to those of 

 S. affinis. 



Oxyhexasters are normal, hemihexactinose or hexactinose. 

 The last mentioned form is numerously represented, and constitutes 

 another notable point of difference from the type- specimen. 

 Diameter, generally 120-186/^; the hexactinose form may be larger, 

 sometimes attaining 242 /^ in axial length. 



Peripheral discoctasters, 143-176/^; those deeply situated, 262- 

 352 !^, rarely up to 428 n in diameter. The upper limit in the 

 size of discoctasters seems to extend very considerably over and 

 beyond that determined for the type specimen. 



Microdiscohexasters of spherical shape and 11)// diameter are 

 occasionally found in the endosome. 



