220 I. IJIMA : HEXACXINELLIDA. I. 



Regadrella O. Scum. 



The genus Regadrella had long been known in a single 

 species, R. pluenix, which was first described by O. Schmidt ('8o). 

 In '96 I referred to that genus a species which I briefly described 

 under the name of R. ohinoseana. Recently F. E. Schulze (19') has 

 described bis R. decora, respecting which I greatly doubt if it can be 

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

 tion will be added another new species to be called R. komeyamai, 

 which shows an indubitably close affinity to R. phoenix O. Schm. 

 Perhaps we have still another species in the specimen which will 

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



Practically, three species come into question in determining 

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

 and okinoseana. 



Granting that all these were correctly referred to one and 

 tbe 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 the lower part of the body. Parenchymalia accessoria 

 thin-rayed diactins, hexactins, &c. Hexasters of 3 

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

 onychaster or oxyhexaster, which latter is generally 

 reduced to the form of oxystauraster. 



