. Bulletin of the Natural History Museum Zoology. FRESHWATER NEMATODES FROM LOCH NESS 19 Head rounded with truncate anterior end, and minute protrusions at margins of lip region Annules pm at mid-body. Lateral field with four lines. Spear 14 pm long with laterally directed knobs wide. Dorsal oesophageal opening about pm behind spear knobs. Excretory pore 69 pm from anterior. Hemizonid just anterior to excretory pore. Oesophagus 84 pm long, poorly pre- served. Vulva flaps prominent about pm long. Vagina curved anteriorly. Anterior genital branch outstretched. Spermatheca not s
. Bulletin of the Natural History Museum Zoology. FRESHWATER NEMATODES FROM LOCH NESS 19 Head rounded with truncate anterior end, and minute protrusions at margins of lip region Annules pm at mid-body. Lateral field with four lines. Spear 14 pm long with laterally directed knobs wide. Dorsal oesophageal opening about pm behind spear knobs. Excretory pore 69 pm from anterior. Hemizonid just anterior to excretory pore. Oesophagus 84 pm long, poorly pre- served. Vulva flaps prominent about pm long. Vagina curved anteriorly. Anterior genital branch outstretched. Spermatheca not seen. Vulva-anus distance pm. Tail tip finely rounded. Remarks. Using Raski's (1975) key to, Paratylenchus spp with a spear < 38 pm long, this female comes to either P. italiensis Raski, 1975 or P. tateae Wu and Townshend, 1973. Unfortunately these species are difficult to separate from one another because of overlap or continuous sequences in respect of their measurements. Head structures are also remarkably similar. The present female differs slightly in respect of ratios c, V and spear length, also the head is not offset. More specimens are required to assess variation and identify this female with any confidence. Aphelenchoides sp. 1 (Fig. 29) Material examined. River Oich: m; core 31, 19. River Foyers: m; core 40, 1 9. Horizon. Core 40, (1-2 cm); Core 31, (2-3 cm). FEMALES, (n = 2). L = 387. 492 pm; a = 35, ; b = , ; c = , ; c' = , ; V = , 69; tail = , pm. Head region smooth, slightly offset. Cuticle with fine striations about pm wide. Lateral fields with four lateral lines, inner pair faint. Spear , pm long with small basal thickenings. Procorpus of oesophagus narrow; median bulb ovoid, valve well developed, located posterior to middle of bulb. Excretory pore less than one body width posterior to median bulb. Vagina slightly inclined anteriorly. Ovary outstretched anteriorly 116, 152 pm long. Spermatheca n
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