LAIsUGINELLA PUPA. lö 



Such forms are nearly as delicate as the so-called microdiscoliex- 

 asters of certain other Rossellids, but grade over by transitional 

 forms into the larger and commonei' vai'ieties, such as are depict- 

 ed in tigs, 1 and 2 (l. c). They evidently correspond to the 

 small and inconspicuous rosettes which were mentioned by F. E. 

 Schulze (Chall. Kep., p. 131) as having been observed Ijy him 

 in some, but not in all, of his specimens. I am likewise of tin- 

 opinion that the form in question is an inconstant one, only 

 exceptionally presented by the smaller discoliexaster of the species. 

 — Further I have to note that in the same specimen I have met 

 with a few hexactinose discohexasters which are in no way dis- 

 tinguishable from the s.inie of Leticopsacus scoliodocus. I believe 

 they are simply extrinsic, and am confirmed in this opinion by 

 the fact that the specimen had been ke[)t in a Ijottle together 

 with the Leucopsacid just mentioned. 



The strobllophimlcome (PI. L, tig. !•) ; also Contrib. III., PI. 

 v.. tig. 7) of the well-known form seems to be constantly present 

 in all individuals though in varying numbers. So sparse is it in 

 some that it requires a special search in preparations in order 

 to find <)]ie. In others it occurs in greater or less jibundancc 

 not confined to the subgastral region but appearing in the sui)- 

 (lennal as wt'll, tiiougli frequently more numerously in the former 

 tlian in the latter. I have met witli tiie rosettes in es])ecial 

 abundance in a large s[»ecimen of 111 mm. height, in which thev 

 occurred subdermally and subgastrally as well as in all ]>arts of 

 the choanosome. 



In one specimen of the species, the rosettes in ijuestion 

 measured in diameter 34-42 // ; in another, 45-50 i'- ; and in still 

 another 50-7G !'■. 



