406 



PART II. SYSTEMATIC ACCOUNT 



together (Fig. 161C). The fore-part of the body is 7 mm long and 1 mm 

 broad. The ventral papillae of the nonmetameric part of the preannular 

 region have many transversely oval cuticular plaques, each with a strong 

 crescentic thickening along the front edge (Fig. 162 A, B)\ they are between 

 40 and 60/x across. 



Fig. 162. GaJathealinum bruuni: A - cuticular plaques from a papilla of the preannular region. 

 В - the same under higher magnification ; С - a piece of one of the funnel-shaped broadenings of 

 the tube under high magnification. 



The tube is slender at the base, which lacks any opening and is about 

 0-8 mm across. The rest of the cylindrical tube somewhat recalls that of 

 Polybrachia annulata but it is distinguished from it by the lesser distance 

 between the funnels (Fig. 161Д E). The tube is 2 mm across at the top and 

 dark brown. A very peculiar feature of the tube, which does not appear to 

 have been noticed by Kirkegaard is the development on its surface of a 

 rather friable, felt-like layer which is absent from the tubes of other Pogono- 

 phora. Under the microscope this layer may be seen to consist of dense, 

 interlacing, rather coarse fibres, the main mass of which are orientated parallel 

 to the length of the tube. Many, if not all, of the fibres curl back at the front 

 end (Fig. 162C). The fibrous layer is attached rather weakly to the tube 

 proper, and the funnels of the tube consist exclusively of this layer, a portion 

 of which is depicted in Fig. 162C. The biggest fragment of tube measured 

 37 cm long. 



Material : Kirkegaard had nine fragments of tubes and two animals. 



Locality: the Celebes Sea, 1°50'N, 119°30'E. 



Depth: 5090-5110 m. 



