DIAGNOSES OF THE SPECIES. oOl 



like layer of jn'ostal pentactins, sj)ringing out from the small 

 conuli of the surface. Dermalia, nearly all rough diactius. Gas- 

 tralia, similar diactius. Oxyhexasters mostly normal or hemihex- 

 actiuose ; rarely hexactinose ; with rather strong, rough terminals ; 

 114 /^ in average diameter. Discoctasters, small ; 100-200 !'■ in 

 diameter. JMicrodiscohexasters, 20 /^ in average diameter ; sparsely 

 present. 



Genus RHABDOCALYPTUS F. E. ScH. 



% 

 (Diagnosis on p. 2o6). 



B» victor Ij. — \^ase-like ; somewhat laterally compressed, 

 especially at base. Veil and fine prostat needles present in the 

 young stage but later are generally cast off. Dermalia, nearly 

 all rough stauractins. Gastralia, similarly rayed hexactins of a 

 nearly regular shape. Oxyhexasters, with rough terminals ; 180- 

 280 /^- in dia. ; hemihexactinose form, numerous ; hexactinose 

 form, not uncommon. Discoctasters, 180-240 /'• in dia. ; terminals 

 nearly straight. jNIicrodiscohexaster of the usual size and shape 

 in sparse distribution. 



/»*. impllis F. E, ScH. — Vase-like or sac-like, laterally com- 

 pressed ; with a strong tendency to form tuljular daughter per- 

 sons along one of the sagittal body-edges. Veil generally cast 

 oft'. Dermalia, nearly all rough diactius. Gastralia, similarly 

 rayed hexactins of nearly regular shape. Oxyhexasters with ter- 

 minals more or less distinctly barbed at base ; hemihexactinose 

 and hexactinose forms, common ; 102-160 i'- in dia. Discoctasters, 

 130-176 !'■ in dia. ; terminals nearly straight or slightly bent 



