Die Sipunculiden Und Echiuriden Der Siboga-Expedition; Nebst Zusammenstellung Der Ueberdies Aus Dem Indischen Archipel Bekannten Arten (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...is close to the tentacle bases. The keels of the bridle lie on a well marked ridge and, though thin, they form a complete ring, being fused on both sides. The crooked line they form on the dorsal side (fig. 8, B) is much the same in all the 7 anterior ends seen. On the posterior end of the mesosoma there is a longitudinal ventral furrow (fig. 8, A).. O-zmm., Fig. 8.? Heptabrachia sp.: A, B, anterior end of animal, latero-ventral and dorsal views; C, anterior part of one unusual tube; D, E, typical middle parts of tube; F, posterior part of tube; G, shape of spermatophore; H, adhesive plaques from postannular papillae; I, arrange-ment of platelets in part of girdle. The metameric region is only 1.0 to 1.3 mm. long and has the papillae arranged on two marked ridges, separated by a rather narrow ventral sulcus. Some of these papillae bear oval adhesive plaques, thickened on one side and 17 to 20 M across. Behind the metameric region there are some isolated papillae, also with adhesive plaques. One short fragment bears one girdle which is made up of a double row of toothed platelets each 10 to 15 / long (fig. 8, J). Another short fragment contains spermatophores 0.2 mm. long. (fig. 8, G). The postannular region has not been seen. This species is rather similar to the previous one (p. 12) but differs in having a double row of girdle platelets, instead of a single row. Also there seem to be rather more than 7 pairs of metameric papillae, the adhesive plaques are a different shape, and the form of the bridle is a little different, as well as always being fused on both sides in this species. However, it is probably another Heptabrachta, though the overlapping collars of one tube suggest some affinity with Polybrachia. The characteristics of this species do not coin...