292 I. IJIMA : HEXACTINELLIDA. I. 



state they are but seldom seen. Common however and in places 

 quite abundant are the more or less disintegrated terminal sheaves 

 which have separated from the mother-rosette and taken up a 

 superficial position, lying vertical to the external surface along 

 with the radial rays of the dermalia. Moore has failed to 

 recognize the graphiocome in its entirety. By him the terminal 

 rhaphides have been mentioned, as ' acicular diacts,' while its 

 central part which remains after the loss of the terminals has 

 been taken by itself for a special kind of rosette. 



Miscellaneous Notes. 



All the specimens at my disposal were not in a fit state 

 for a study of the soft parts. It could however be determined 

 that the chamber-layer extends to the extreme end of the 

 branches ; further, that the ectosomal surface, lying some distance 

 above the dermal paratangentials, is lifted into little conuli by 

 the ends of the dermal hilt-rays (PI. XIII, fig. 21). 



PI. XIII, fig. 4 shows a case of monstrosity in which the 

 superior end of the stem is dilated into an irregularly pyramidal, 

 compressed and thin-walled sac. The wall is perforated by a 

 number of typical oscula. This anomaly had evidently arisen in 

 connection with the rej)arative growth after the stem had sus- 

 tained an injury in that part. 



AVith respect to the commensal — possibly symbiotic — Hydro- 

 zoa, the state of preservation was in no case such as allowed an 

 exact investigation into its characters. But this much could be ob- 

 served : that each hydranth possesses nujuerous finger-like tentacles 



