GALATHEALINUM 403 



funnels so stacked that each encloses the next. The dimensions and shape of 

 the funnels are subject to considerable variation: in the front section of the 

 tube they are larger and thicker (Fig. 160/)), in the middle part they gradually 

 grow smaller and ultimately, in the hindmost part, they are separated by 

 considerable smooth intervals and are hardly perceptible. Since in general 

 they are rather thin this is probably a consequence of their having worn 

 away. The largest fragment of tube is 45 mm long and 0-5 mm in diameter at 

 the narrowest part of the funnels. 



The diagnostic features of P. gorbunovi are as follows: the small number of 

 tentacles and the short intervals between the successive funnels in the tube. 



Material : a few fragments of tubes from which one incomplete animal was 

 extracted. 



Locality: the Arctic Ocean, in the Laptevykh Sea (or Laptev Sea, in some 

 atlases). 



Depth: с 3700 m. 



6. Genus Galathealinum Kirkegaard, 1956 



Kirkegaard, 1956a: 82; Kirkegaard, 1956b: 186; Jagersten, 1956: 76; Ivanov, 1957a: 

 431, 460, 461, 492, 494; Dajoz, 1958: 236, 237; Ivanov, 1960a: 1525, 1529, 1531, 1539, 

 1620; Ivanov, 1960c: 6, 9, 12, 14, 24, 107-8, 115, 239, 266; Ivanov, 1961c: 1378, 1384. 



[The diagnosis given for the genus Galathealinum in the Russian edition of 

 this book (Ivanov, 1960c) was based on the data of Kirkegaard (1956). One 

 very important feature to which no attention had been paid concerns the 

 multiplicity of cuticular plaques on the adhesive papillae. In his drawing 

 (reproduced here as Fig. 161), Kirkegaard represented two plaques on most 

 of the papillae of G. bruuni. In G. brachiosum there are usually four or five 

 plaques on each papilla and sometimes as many as ten. In all the remaining 

 Pogonophora the papillae have only one plaque each, if plaques are present 

 at all, that is. Only in Polybrachia barbata have double plaques been described 

 (p. 398); in this species on some papillae one plaque lies immediately behind 

 another, with the hind one often underdeveloped. Another very characteristic 

 feature found only in the genus Galathealinum is the external felt-like fibrous 

 layer of the tube, from which the funnel-like frills of each segment are 

 formed. 



A revised diagnosis of the genus Galathealinum is given below. 



The anterior part of the trunk has two or more plaques on each papilla. 

 The plaques lie on oval or round cutaneous eminences. Each papilla in the 

 nonmetameric part of the preannular region bears many plaques. The cepha- 

 lic lobe is separated from the protosoma by a dorsal groove. The mesosoma 



