30 ART. 9. 1. IJIMA : HEXACTINELLIDA. 



The subfamily in question is the Tsegerinae of F. E. Schulze. 

 Granting that this is to be kept up as separate from the Euplec- 

 tellinae, there seems to be a necessity for renaming it, since 

 Tœgeria has sunk to the rank of a synonym of Corbilella. I 

 therefore propose to call the subfamily by the name of Cor- 

 bitelliiue. 



The definition of the subfamily Covbitellinœ would be some- 

 wliat as follows : 



Euplectellidai of saccular or tubular body, always 

 firmly attached by the base to solid substratum. Su- 

 perior end of body mostly with a sieve-plate. Lateral 

 wall with parietal oscula which are devoid of sj^ecially 

 differentiated oscularia. Skeletal lattice-work usually 

 irregular; fused or unfused. Principalia parenchymalia 

 as a rule diactins, sometimes stauractins. Accessoria 

 parenchymalia slender-rayed diactins, hexactins, etc. 

 Spiny microhexactins present in many. Hexasters 

 generally include floricome and graphiocome, in addi- 

 tion to which there usually occur one or more other 

 hexaster varieties. 



The genera and species sufficiently known to be referable 

 to this subfamily are : 



1. Corbitella speciosa (Q. and G.). Moluccas. 



2. C. elegans (Marsh.). Moluccas. 



3. G. pulchra (F. E. Sch.). Fiji Is. 



4. Heterotella corbicula (Bowerb.). Bourbon Is. 



5. Regadrelhi pkœnix O. Schm. Atlantic, E. Pacific. 



6. E. okinoseana Ij. Sagami Sea, Indian Ocean. 



7. R. homey amai I J. Sagami Sea. 



