220 I. IJIMA : HEXACTINELLIDA. I. 



Regadrella O. Schm. 



The genus Regadrella bad long been known in a single 

 species, R. phœnix, wbicb was first described by O. Schmidt ('8o). 

 In '96 I referred to tbat genus a species wbicb I briefly described 

 under the name of R. oh'inomana. Recently F. E. Schulze (19') bas 

 described bis R. decora, respecting wbicb I greatl}' doubt if it can be 

 held to be distinct from my R. ohinoseana. In tbe present Contribu- 

 tion will be added anotber new species to be called R. homeyamai, 

 wbicb shows an indubitably close affinity to R. phœnix O. Schm. 

 Perhaps we have still anotber species in tbe specimen wbicb will 

 also be described later on, provisionally identified as R. phœnix. 



Practically, three species come into question in determining 

 the generic status of Regadrella ; viz., R. phœnix, komeyamai, 

 and ohinoseana. 



Granting tbat all these were correctly referred to one and 

 the same genus, the generic diagnosis will have to be drawn up 

 somewhat as follows : 



Tubular or saccular Euplectellid, firmly attached 

 to the solid substratum by a hard, knobby base. Su- 

 perior end having a sieve-plate, which may be re- 

 presented by remnants of its beams — a number of 

 spicular rays in a wreath. Lateral wall with round 

 parietal oscula. Skeletal beams running obliquely; 

 with strong diactins as their principalia; fused together 

 in tbe lower part of tbe body. Par en c by m alia accessoria 

 thin-rayed diactins, hexactins, &c. Hexasters of 

 kinds: 1) floricome, 2) graphiocome and 3) either 

 onychaster or oxyhexaster, w^hicli latter is generally 

 reduced to the form of oxystauraster. 



