292 ART. 7. — 1. IJIMA : HEXACTINELLIDA, IV. 



principal generally with 2-4, rougli, moderately strong terniinal^^; 

 marginal prongs of terminal dise, clistinetly developed. k5trobilo- 

 plumieome, 34-7(3 P- in dia. 



Genus SCYPHIDIUM F. E. Sch. 



(Diagnosis on p. 2(1). 



.S. lonfßis/tiie(f (I.j.).- -Saccular, moderately thick-walled, some- 

 what like a pear in shape but smaller, wdtli an osculum at the 

 upper rounded end ; firmly attached l)y the contracted base. 

 External surface with low conuli, fi'om which there arise long 

 and rather strong, diactinic prostalia. In association with these 

 may occur a few small and inconspicuous pentactinic prostalia, 

 with paratangentials which are smooth or shagreen-like and 

 either regularly cruciate or paratropal. Dermalia, predominantly 

 stauractius Avith s])inose rays. Gastralia, similarly rayed hex- 

 actins of a larger size. Oxyhexaster, 88-104 f- dia., fretpiently 

 hemihexactinose and hexactinose in the deeper part of the cho- 

 aiiosome. Discohexaster, 90-130 /'■ dia., with slender terminals. 

 Microdiscohexaster of the typical shape, 23-25 /^ dia. 



,V. n(imit/<i (Ij.)— Saccular, laterally compressed, moderately 

 thick-walled, with one or more secondarily formed oscula (or 

 buds) besides the main osculum, [irmly attached by rather broad 

 base. Short, line prostal needles present in insignilicaiit numbers 

 near the oscular margin ; for the rest, the surface is tolerably 

 smooth. Dermalia, stauractius and pentactins with spinose and 

 rather strong rays. Gastralia, similar hexactins aiul pentactins. 

 Oxyhexaster, 53-7(3 /'- dia.; only occasionally hemihexactinose. 



