. Bulletin of the Natural History Museum Zoology. 124 PALM AND T. WALTER The following measurements were taken: Scolex length (SL), scolex width at level of pars bothridialis (SW), pars bothridialis (pbo), pars vaginalis (pv), pars bulbosa (pb), pars postbulbosa (ppb), velum (vel), appendix (app), bulb length (BL), bulb width (BW), bulb ratio (BR), proportions of pbo/pv/pb (SP), tentacle width (TW), and tentacle sheath width (TSW). If possible, the tentacle length (TL) was estimated. Additionally, the tentacular armature was de- scribed as follows: armature homeomorphous or heteromorphous
. Bulletin of the Natural History Museum Zoology. 124 PALM AND T. WALTER The following measurements were taken: Scolex length (SL), scolex width at level of pars bothridialis (SW), pars bothridialis (pbo), pars vaginalis (pv), pars bulbosa (pb), pars postbulbosa (ppb), velum (vel), appendix (app), bulb length (BL), bulb width (BW), bulb ratio (BR), proportions of pbo/pv/pb (SP), tentacle width (TW), and tentacle sheath width (TSW). If possible, the tentacle length (TL) was estimated. Additionally, the tentacular armature was de- scribed as follows: armature homeomorphous or heteromorphous, hooks per half spiral row (hsr), total hook length (L) and the total length of the base (B). All measurements are given in micrometers unless otherwise indicated. Illustrations are provided where useful, otherwise the reader is referred to illustrations of other authors. The classification follows that of Palm (1995, 1997) and the orientation of the tentacu- lar surfaces follows that of Campbell & Beveridge (1994). RESULTS The comparison of Tetrarhynchus perideraeus Shipley & Hornell, 1906, BMNH , from the Southwell collection with the co-type material of T. perideraeus from the VNHM (2109, 2111) revealed differences. The BMNH material corresponds neither with the co-types from the VNHM nor with specimens of T. perideraeus as re-described by Dollfus (1942. Figs 98-100). Similarly, the type material of T. perideraeus from the VNHM clearly differs from the specimens described by Dollfus (1942). Thus, the material deposited and described above belongs to three different Nybelinia species. In the following, Nybelinia perideraeus (Shipley & Hornell, 1906) is re-described and the material collected by T. Southwell and deposited in the BMNH, which does not fit in any of the currently accepted species (Palm etal., 1997), is described as N. southwelli sp. nov. Another species deposited in the VNHM, Tetrarhynchus herdmani (Shipley & Hornell, 1
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