5Q ART. T. T. TJIMA : IIEXACTINELLTDA, IV. 



malin diactins, in addition to which medium-sized hex- 

 actins may sometimes occur. Pentactinic hypodermalia 

 with regularly cruciate paratangentials, always present. 

 Dermalia, rough pentactins or stauractins or both. 

 Gastralia, generally similar pentactins and sometimes 

 stauractins. Oxyhexaster as a rule normally devel- 

 oped. ])iscohexaster in one form, which is usually 

 small (microdiscohexaster with diameter under r)0 ,"), 

 Init may be of a considerably larger size (80-120 /i dia.). 



Til the Challenger Report F. E. Schulze instituted a genus 

 Avlochone as distinct from Crateromorpha. In '97 (]). '139) the 

 same investigator included the former under the latter, thus 

 joining the two genera into one, on account of the far reaching 

 agreement in spiculation. However, I think the distinction be- 

 tween the two genera mentioned may be kept u]i in view of the 

 fact that, while ( -rater omorpha possesses pentactinic hypodermalia, 

 Aulochone is altogether devoid of these, — a sort of difference 

 analogous to that which separates Aecmthascus from either 

 RhahdoGalyptiis or Stmirocalyptiis. 



Under Aulochone as a distinct genus may be placed not only 

 F. F. Sohulze's original A. cylindrica (from the Kermadec Is.) 

 and A. lilt 11)11 (from the IVIeangis Is.) but also the South Afi-i- 

 can species recently described by R. Ivtekpatrick ('02) under 

 the name of Grateromorpha lankesieri. 



To the genus Craterornorpha I refer the species and varieties 

 eml)odied in the followinir 



