. Bulletin of the Natural History Museum Zoology. 12 WANLESS AND R. HUNTER India, Malawi, Holland, Poland and Belgium. Terrestrial, found in various soils, forest litter and sand dunes. Remarks. These specimens are all identified as M. acarayensis using Geraert & Raski's key (1986); furthermore they compare well with the range of measurements presented for M. acarayensis. However, they possibly differ by the more anterior origin of the lateral field, pm behind spear base in these females, com- pared with 11-15 um in a Spanish population (Gomez Barcina et al., 1992). Other popu
. Bulletin of the Natural History Museum Zoology. 12 WANLESS AND R. HUNTER India, Malawi, Holland, Poland and Belgium. Terrestrial, found in various soils, forest litter and sand dunes. Remarks. These specimens are all identified as M. acarayensis using Geraert & Raski's key (1986); furthermore they compare well with the range of measurements presented for M. acarayensis. However, they possibly differ by the more anterior origin of the lateral field, pm behind spear base in these females, com- pared with 11-15 um in a Spanish population (Gomez Barcina et al., 1992). Other populations are more difficult to compare in the same manner as the start of the lateral field is given as originating at a level of 1/3 to about middle of the oesophageal procorpus (Geraert & Raski, 1986). Malenchus bryophilus (Steiner, 1914) Andrassy, 1980 (Fig. 15) Material examined. Fort Augustus Bay: 91, 105 m; cores 2, 7, 1 ?, 286. Foyers Plateau: 158, 160 m; cores 15, 18, 1 9, 18. River cm; core 31, 2$?. Horizon. Core 2 (1-2 cm) Core 31 (3-4 cm). FEMALES, (n = 4). L = um (334-364); a = (); b (n = 2) = (); c = (); c' = (); V = (); V = (); tail/V-a = (); tail 72 um ().. Head slightly narrowed, about 5 pm wide at base with 4-5 annules. Amphids not clear. Annules — pm at mid-body. Lateral field with two lines appearing smooth or crenated depending on fine focus; originating at level of spear knobs to two annuli posterior, or pmfrom spear knobs, ending between 25-35% of tail length. Spear fine, especially conus, pm long, knobs small, about pm wide. Excretory pore 61-71 pm from anterior. Oesophagus pm long (n = 2); median bulb ovoid, valve poorly developed, at 45-50% of oesophageal length (n = 2). Vulva sunken. Vagina perpendicular or slightly tilted anteriorly with thickened walls; anterior genital branch 96-113 pm long; spermatheca rounde
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