418 



PART II. SYSTEMATIC ACCOUNT 



Table A5 

 Characteristics of the species of Galathealinum 



[7. Genus Sclerolinum Southward, 1961 



Southward, 1961: 16, 18. 



The genus includes Pogonophora in which the protosoma, mesoma and 

 metasoma are not separated by grooves from one another, the cephalic lobe 

 is separated by a groove from the rest of the protosoma; the metameric 

 region has paired lateral ridges rather than individual papillae and lacks 

 adhesive plaques, while the nonmetameric papillae have adhesive plaques. 

 The tube is also characteristic: it lacks segmentation and rings, its walls 

 are very thick except at the anterior end, where it is thin and limp, and most 

 of its wall is also very much wrinkled. 



Type of the genus and sole species: Sclerolinum sibogae Southward, 1961.] 



[1. Sclerolinum sibogae Southward (Fig. HI 62) 



Southward, 1961a: 16-18, 21. 



This species forms part of the Siboga material, originally included in 

 Siboglinum weberi. The following description is quoted from Southward 

 (1961a) by kind permission of the author and the publisher, E. J. Brill. 



"The tubes are very brittle and all attempts to extract the animals have 

 failed. The following description is based on what can be seen through 

 the wall of the tube, with the help of various clearing agents and stains. 



