REPORT ON THE HEXACTINELLIDA. 



411 



IX . Eu PLECTELLi d;e — rnntin nod. 



The lateral wall of the sack or tube-like body is traversed 

 by irregular parietal apertures of variable form and 

 size, and is partially supported by a framework of 

 united parenchymal spicules. The distal radial ray 

 of the dagger-shaped hexact hypodermalia bears a 

 floricome (T.egerin.e), .... 



X. EuPLECTELLINiE. 



With basal root-tuft. The parenchyma contains oxyhex- 

 asters {EuiilecMJa, Owen), 



Attached by a firm basis to solid bodies. The 

 parenchyma contains discohexasters {Regadrella, 

 0. Schmidt), ..... 



XI. Eupledella, Owen. 



In each of the meshes which are formed by the inter- 

 section of the longitudinal and circular principal 

 strands of fibres, there is a parietal pore. The 

 parietal pores are thus arranged in regular transverse 

 and longitudinal rows, .... 



Perforate meshes alternate, usually with some regularity, 

 with imperforate, so that the parietal pores are 

 disposed in oblique spiral rows or irregularly, 



1 Curved tube, with externally projecting ridges and 



superior annular cuff, .... 



Straight tubes, without externally projecting ridges, 



2 In the middle of each parietal convexity, lying between 



every four parietal pores, there is a strongly 

 developed oxyhexact, with a distal ray projecting 

 for some distance outwards, 

 Without these principal hexacts in the centre of the 

 convex parietal elevation, .... 



3 The annular membrane of the parietal gaps contains 



sceptre-like monacts, .... 



No sceptres in the annular membrane of the parietal 



gaps, ...... 



4 The annular membrane of the parietal gaps includes, 



besides the sceptres, S-shaped clasps. 



Without S-shaped clasps, .... 



b The abundant parenchymal oxyhexasters have long and 

 extraordinary thick principal rays. 



Parenchymal oxyhexasters, not as yet observed, and 

 therefore either very sparsely present or altogether 

 absent, ...... 



PACK AND PLATE 



XVL 



XI. 



XII. 



Eupledella oicenii. 



78 



VI. 



Eupledella aspergillum, . 64 



I.-IV. 



76 



Eujiledella rnrumer, 



3 



i 



5 



Eupledella jovis, . 77 



VI. 



Eupledella suberea, , 73 



v., VI. 



Eupledella crassistellata, . 81 



XIII. 



Eupledella nodosa, 



82 



XIV. 



