Figure 4. Siboglinum bogorovi. A, anterior extremity of female, in dorsal aspect. B, the same in ventral aspect. C, metameric zone of the pre-annular region, in ventral aspect (the continuation of that part of the body illustrated in B). D, region of concentrated papillae, in ventral aspect. E, annular region in ventral aspect. F, the same in dorsal aspect. G, portion of an annulus. H, denticulate platelet seen in oblique lateral aspect. I, portion of the post-annular region. J, anterior membranous region of tube. K, tube fowards the anterior region. I, middle portion of tube. M, posterior portion of tube.
Abbreviations: sc, dorsal glandular shield; v, ventral papilla. Other abbreviations as in preceding figures.