184 PART II. SYSTEMATIC ACCOUNT 



The part of the trunk between the metameric and girdle regions seems to be 

 devoid of any sort of papillae, and the whole preannular region is only 4 to 9 

 mm long. There are two girdles, usually forming incomplete rings, 0-85 to 

 1-2 mm apart (Fig. 96Я, J). In the space between them there are, in some 

 specimens, a few large papillae without adhesive plaques. Each girdle has a 

 single, regular row of toothed platelets, each of which is 12 to 15/x long and 

 has its teeth arranged in two approximately equal groups (Fig. %K). The 

 postannular part of the trunk is up to 8-5 mm long. On it can be seen occa- 

 sional large papillae, crowned with adhesive plaques in the form of curved 

 bars about 15/x long (Fig. %L). 



"Most of the specimens contain gametes, and there seem to be about twice 

 as many males as females. The spermatophores are remarkably small, always 

 being about 40/x long, and their filaments have not been seen (Fig. %M). 

 One female has developing larvae in the anterior part of the tube. 



"A more or less complete male specimen, 14 mm long, has been chosen as 

 the lectotype of S. weberi, from among the specimens from sta. 212. 



"The tubes of this species are among the finest in the material. All are 

 broken, and the biggest fragment is 3 cm long. The diameter is fairly con- 

 stant for any one tube, but in different individuals it ranges from 0-10 to 

 0-135 mm; though it is only rarely over 0-12 mm. The wall of the tube is 

 thin, wrinkled outside and smooth inside (Fig. %A). At the anterior end it is 

 limp and colourless for a few mm, then narrow brown rings appear, separated 

 by whitish interspaces, and the tube becomes stifTer, though the walls 

 remain thin (Fig. %B). Farther back the rings become lighter in colour and 

 split into pairs; the wall gradually becomes smoother towards the posterior 

 end, and has narrow yellow rings, usually in pairs, which sometimes form a 

 more complex pattern with spots or bars between them (Fig. 96C). 



"The animals inhabiting these tubes are up to 17 mm long and have a 

 single tentacle up to 4-2 mm long. The fore-part of the body is from 0-6 to 

 1-2 mm long. 



"S. weberi as described above, is rather similar to S. pusillutn Ivanov, 

 which occurs in the N.W. Pacific Ocean. There is a strong likeness between 

 the tubes of the two species and some points of similarity between the animals. 

 The tubes are wrinkled and provided with rather narrow (often double) 

 brown rings in both species, but in S. pusillum there are also fine transverse 

 fibres in the tube walls ; these have not been seen in S. weberi. 



"The animals differ in the following ways: (i) the length of the pinnules is 

 equal to the diameter of the tentacle in S. pusillum but is twice the diameter 

 of the tentacle in S. weberi; (ii) there is a complete post-tentacular groove in 



