OLIGOBRACHIA IVANOVI 



161 



long and is separated from the mesosoma by an oblique groove which reaches 

 the anterior point of the bridle on the dorsal side. Patches of white glands are 

 present on the proto- and mesosoma and their positions are shown in 

 Fig. A92B and С by heavy stipple. 



Fig. A92. OHgobrachia ivanovi : 

 A - part of the tube (surface 

 view); В - anterior end, ventral 

 view; С -anterior end, dorsal 

 view; D - part of tentacle; E- 

 girdle region ; F-G - adhesive 

 plates from smaller and larger 

 papillae of trunk ; H - spermato- 

 phores, filament removed from 

 one. 



Q 



<o 



005 



"The anterior part of the metasoma or trunk, called the metameric region 

 in other genera, has white epidermal glands arranged in 2 lateral bands 

 separated by a deep sulcus ventrally and by 2 dark brown stripes dorsally. 

 Between the brown stripes lies the dorsal ciliated band which is pinkish 

 white. The white bands are spotted with 3 to 4 rows of clear patches which 

 mark the openings of internal pyriform glands. These patches lie in regular 

 oblique lines and show up clearly because they are surrounded by brown 

 rings. This glandular region of the body is 10 mm long. The second region of 

 the metasoma lacks epidermal glands but bears numerous small papillae 

 arranged in 2 irregular rows along the ventral side for about 50 mm. The 

 rows of small papillae are followed by large papillae, arranged in 3-4 rows, 

 extending for 10 mm, the zone of thickened papillae, while the last 5 mm of 

 the preannular region is devoid of all but a few small papillae. Both large 

 and small papillae are armed with half-moon-shaped adhesive plaques 

 (Fig. A92G), but the plaques are difficult to see because they are almost colour- 

 less. There are 2 girdles (annuli), which both encircle the body completely, 

 and each is made up of 2 to 3 rows of platelets. The last 10 mm of the body 

 has no papillae, plaques or epidermal glands and is broken off abruptly. 



