420 



PART II. SYSTEMATIC ACCOUNT 



station 212. They all seem to be broken up and none is more than 5 cm long. 

 Most of them are about 0-13 mm in diameter but they vary between 0-10 

 and 0-15 mm. The tube wall is light brown or yellow, very thick (15/x), very 

 stiff and deeply wrinkled (Fig. H162A). The first 1 to 2 mm. of the tube has 

 thinner limp and colourless walls. The tubes are very brittle and all attempts 

 to extract the animals have failed. 



Fig. HI 62. Sclerolinum sibogae: A - part of tube; В - anterior end of animal, latero- ventral view; 

 C,D- dorsal and ventral views of anterior end of animals ; E - ventral view of bridle ; F - adhesive 

 plaques from preannular papillae; G- shape of spermatophore. (Southward, 1961a.) 



"In spite of the absence of girdles and postannular region this species 

 can be seen to be unlike any known genus. It appears to belong to the 

 Polybrachiidae because it possesses the following combination of charac- 

 teristics: the wall of the tube is thin and limp at the anterior end; the 



