SIBOGLINUM TIMORENSE 275 



[28. Siboglinum timorense Southward (Fig. D133) 

 Southward 1961b: 8-9, 21, Fig. 4. 



This is another species of the Siboga material, originally included in 

 6". weberi. The following description is by Southward (1961b), by kind per- 

 mission of the author and the publisher, E. J. Brill. 



"Seven of the tube fragments are in alcohol but have dried out at some 

 time so that details of their contents cannot be distinguished. The other two 

 are mounted on one of Caullery's slides and together contain the well- 

 preserved anterior half of a species of Siboglinum. 



"The two mounted fragments contain parts of an animal totalling 30 mm 

 with a coiled tentacle 44 mm long (this is the specimen on which Caullery's 

 Fig. 2 was based). The tentacle is very thick, contracted, and provided with 

 a band of fine pinnules (Fig. D133Z)). This band is apparently five to seven 

 pinnules in width for most of its length, and each pinnule is about 70^ long 

 and only 5[x in diameter. The tentacle is joined to the protosoma at the bottom 

 of a slight depression. The cephalic lobe is rather long and its anterior end is 

 rounded; there is no pretentacular groove. Between the base of the tentacle 

 and the bridle there are three transverse grooves (Fig. D133v4, C), the second 

 complete one is oblique; it touches the dorsal points of the bridle and pro- 

 bably separates the protosoma and mesosoma. Just in front of the bridle is a 

 short, deep, longitudinal furrow. The bridle itself is a slight ridge crowned 

 by prominent dark keels, which are fused into a point ventrally but just 

 separate dorsally (Fig. D133y4, C). Close behind the bridle there is a broken 

 ring formed of two bands of epidermal glands which are just separate on the 

 ventral side and far apart on the dorsal side. Together the protosoma and 

 mesosoma are 1-43 mm long, with a maximum diameter of 0-23 mm. 



"The metameric region of the trunk has about 70 pairs of papillae, on 

 definite ridges separated by a deep ventral sulcus, and the epidermis of these 

 ridges has a distinctly glandular appearance (Fig. D 133^4). The metameric 

 region is 4-25 mm long. The following 15 mm of the preannular region 

 lacks papillae but the last 10 mm bears at least 20 large papillae, irregularly 

 arranged, with a curved bar (adhesive plaque) 20/x long on each. The girdles 

 and the postannular region are missing. Some sections, prepared by Caullery, 

 are from the genital region of this specimen and contain small oocytes. 



"The largest fragment of tube is 7 cm long, and the diameter is much the 

 same for all tubes, at between 0-32 and 0-34 mm. One end of the tube is 

 unringed and colourless but the remainder is ornamented with wide greyish 

 brown rings (Fig. D133Z?). The tube wall is thick (30^) and at the narrow 



