420 



THE VOYAGE OF H.M.S. CHALLENGER. 



PAGE AND PLATE 



LXXL MiEANDBOSPONGID^, Zittel. 



The very regular dictyonal framework enclosing cubical 

 meshes has perforated nodes of intersection with 

 octahedral edges {Aulocystis, F. E. S.), 



The nodes of intersection of the dictyonal framework 

 are simple and imperforate, 

 LXXII. Aulocystis, F. E. S. 



The octahedral edges of the perforated nodes of inter- 

 section of the dictyonal framework are formed of 

 simple oblique round buttresses. The parenchyma 

 contains abundant discoliexasters in which the 

 terminal rays are as long as the prtucipals, . 



The octahedral edges of the perforate nodes of the 

 dictyonal framework are formed of the sometimes 

 repeatedly perforate plates, which extend between 

 the intersecting beams. The principal rays of the 

 jiiarenchymal discohexasters are much shorter than 

 the termiuals, ..... 



LXXIIL The nodes of intersection of the dictyonal framework 



are thickened and beset with broad tuberculate 

 warts (Mj/Uusia, Gray), .... 

 The nodes of intersection of the dictyonal framework 

 possess no broad tuberculate warts (Dactylocalyx, 

 Stutchbury), . . , , . 



LXXIV. Myliusia, Gray, with the single species, 



LXXV. Dactylocalyx, Stutchbury. 



The body forms a flatly expanded thick-walled cup, which 

 consists of a system of narrow tubes, only 1 to 2 

 mm. in width. The parenchyma contains, besides 

 other isolated spicules, oxyhexasters, 



The body forms a dee^j thick-walled goblet, which 

 consists of a system of narrow (only 1 to 2 mm. 

 in width) tubes. No oxyhexasters in the paren- 

 chyma, ...... 



The flat body consists of tubes 3 to 5 mm. in width. 



LXXII. 

 LXXIIL 



Aulocystis zittelii, 



359 



CIV. 



Aulocystis grayi, . 



LXXIV. 



LXXV. 



Myliusia calloeyathus, 



357 



CIV. 



352 

 cm. 



Dactylocalyx pumieeus, . 346 



Dactylocalyx suhglobosus, 347 



XCIX. 



Dactylocalyx patella, . 348 



