258 I. IJIMA : HEXACTINELLIDA. I. 



remain with some degree of persistence only a basal cup of un- 

 substantial structure, in height probably not more than one- 

 tenth of that of the original specimen. 



With regard to the second, smaller individual, I may be 

 brief. It stands out straight from the base without bending, the 

 wall being more outbulged on one side than on the other. 

 Total height 145 mm ; greatest breadth 63 mm. in one direction 

 and 54 mm. in another. Breadth at inferior end 19-23 mm. 

 Terminal osculum circular, 17 mm. in diameter. Cuff 2 mm. wide. 

 Coronal rays not less than 33 in number, mostly 7-10 mm. long. 

 Prominences on the dermal surface much less pronounced than 

 in the larger individual. 



Spiculation. 



T\\Q ■parenchymalia consist predominantly of diactins, hexact- 

 ins entering into their composition as occasional elements. 



The principalia in the parenchymal bundles are oxydiactins 

 which may attain a length of 30 mm. and more \Yitli a breadth 

 of 130// at the middle. Their form and arrangement agree well 

 with the corresponding spicule in the specimen which will next 

 be described, identified as R. phœn'ix ; but they are relatively 

 more slender. 



The aceesoria, occurring as comitals or running either loosely 

 or in strands by themselves, are mostly thin and filamentous 

 diactins with an average thickness of about U //. and a length of 

 10 mm. or more. The center is cruciately knobbed, more com- 

 monly only annulated. Subterminally usually sliglitly swollen 



