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Somalvhynchia, Septaliphoria, and Torquirhynchia gen. nov. are described. By using serial sectioning and acetate peel techniques, the internal structures of all but the rarest species have been investigated and the majority of these are described and figured for the first time. New taxa include six species, a subgenus, and a genus.Observations on ecology and distribution are given with the specific descriptions and separate sections are also included dealing with these aspects at generic level. as seen in transverse section would seem to be the way in which, from being initially flattened in the plane of articulation, by the development of vertical elements at their inner ends, they again become flattened but lying at right angles to the plane of articulation and slightly to the ventral side of it.Species. The following nominal species are attributed to the genus M. czenstochaviensis (Roemer) (1870, p. 247, pl. xxii, figs. 12-14) M. lineolata (Phillips) (as figured by Jacob and Fallot 1913, pp. 17-18, pl. i, figs. Q-14).

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