EHABDOCALYPTUS CAPILLATÜS. 277 



Maye-no-Yoclomi ; Mochiyama ; Inside Okinosé by the Ena-line ; 

 Outside Okinosé by the Iwado-line ; and Homba ; — all in the 

 Sagami Sea. Depth, between oOO and 572 m. (274 and 313 fms.). 

 The samples of the bottom found attached to some of the speci- 

 mens are tufaceous. In one case six small specimens were found 

 seated on a dead Ckonelasma calyx from Maye-no-Yodomi. An- 

 other dead Chonelasma calyx from Mochiyama bore three young 

 individuals of the species together with two of Staurocalyptus glabcr. 



The smallest specimen I have had was globular in shape, 

 measuring only about 3 ram. in diameter. It already possessed a 

 small osculum, while from its surface there emanated, almost 

 radially, a number of fine prostal diactins that stood out isolated. 

 These were the only prostalia to be seen on it. 



The next larger specimen, shown in natural size in PL 

 XXIL, fig. 3, is bcirrel-like ; it shows in addition to prostal 

 diactins some small pentactinic prostalia. But these are as yet 

 quite few in number. 



Young specimens (figs. 4 and 5), still larger but under 30 

 mm. or thereabout in height, may be said to retain the barrel- 

 like shape, the cross-section of the body being of an approximately 

 circular outline. Both the diactinic and the pentactinic prostalia 

 have greatly increased in number. The former are more abun- 

 dant in the upper parts of the body than in the lower, being 

 most numerous in the marginal zone around the circular osculum. 

 The latter are present all over the body, mostly arising in tufts 

 from slight elevations of the dermal surface. The general appear- 

 ance of young individuals closely resembles that of R. victor of 

 about the same size, so that in their cases the microscopic 

 examination of the spicules is quite indispensable to insure correct 

 identification. 



