412 



THE VOYAGE OF H.M.S. CHALLENGER. 



Xn. Reijadrella, 0. Schmidt, with tlie single species, 



Xin. On the internal surface of the somewhat firm and 



compact tube-wall, there is a rectangular meshwork 

 formed from longitudinal and annular bands, and 

 forming pit-like depressions in the meshes 

 {Holascm, F. E. S.), 

 The internal surface of the very loose body- wall exhibits 

 irregularly distributed round apertures of the 

 efferent canals [Malacosaccus, F. E. S.), . 



XIV. Holascm, F. E. S. 



The principalia are oxypentacts or oxyhexacts, . 

 The principalia are oxytetracts, besides which oxyhexacts 

 also occur, ..... 



1 The gastralia are hexacts, .... 



The gastralia are pentacts, .... 



2 The gastralia are oxypentacts. The parenchyma con- 



tains fibulfe, ..... 



The gastralia are oxyhexacts. No fibulfe in the 

 parenchyma, ..... 



XV. Malacosacxus, F. E. S. 



The parenchyma contains small discohexasters with 

 numerous terminal rays on the transverse terminal 

 discs of the principal rays, 



Regadvella phoenir, 



PAGE AND PLTAE 



84 



XIII. 



XIV. 



Malacosaccus vastus 



There are in the parenchyma no small discohexasters 

 with numerous terminal rays on the transverse 

 terminal portions of the principal rays. Floricomes 

 with two or five terminal claws on each terminal ray, Malacosaccus unguiculatus 



XVI. TiEGERIN^, F. E. S. 



Roundi-sh, usually circular parietal gaps. Over the 

 oscular aperture there is an arched cupola of radial 

 spicules {Tsecieria, F. E. S.), 

 Parietal gaps irregular, angular (Walteria, F. E. S.), 

 XVII. Tsegefia, F. E. S., with the single species, 



91 



XVIII. 



93 



XIX. 



XVIII. Walteria, F. E. S., with the single species, 



XIX. ASCONEMATID.^;, F. E. S. 



The wall of the cup-, funnel-, or tube-shaped body consists 

 of a thin loose plate (AscoNEMATiNiE), 



The wall of the (always 1) stalked goblet-shaped body is 

 somewhat thick and firm (Sympagellin.*), 



The body has a mushroom-like shape, with long hollow 

 stalk (Caulophacin^), .... 



XVII. 

 XVIII. 



Txgeria pulchra, 94 



VII., VIII., XI. 



Walteria flemmingii, . 96 

 IX., X., XI. 



XX. 

 XXIII. 



XXVII. 



