. Bulletin of the Natural History Museum Zoology. FRESHWATER NEMATODES FROM LOCH NESS 17 Head not offset from body, with labial cap and one postlabial annule. Cuticular annulation distinct but fine, about urn wide at mid-body. Lateral fields with four lines. Spear slender, urn long with small backward-sloping knobs. Dorsal gland opens urn behind spear knobs. Length of oesophagus (from anterior to median bulb) urn; median bulb more or less ovoid; excretory pore urn from anterior. Hemizonid immediately anterior to excretory pore. Phasmid not seen. Tail terminus tapers shar
. Bulletin of the Natural History Museum Zoology. FRESHWATER NEMATODES FROM LOCH NESS 17 Head not offset from body, with labial cap and one postlabial annule. Cuticular annulation distinct but fine, about urn wide at mid-body. Lateral fields with four lines. Spear slender, urn long with small backward-sloping knobs. Dorsal gland opens urn behind spear knobs. Length of oesophagus (from anterior to median bulb) urn; median bulb more or less ovoid; excretory pore urn from anterior. Hemizonid immediately anterior to excretory pore. Phasmid not seen. Tail terminus tapers sharply with a short terminal portion ending in a finely rounded tip. Length of hyaline tail terminus pm. Distribution and habitat. Recorded from Estonia, Russia, Po- land and the United Kingdom, all in wet sandy, peat and silt soils (Karssen & Van Hoenselaar. 1998). Remarks. The present second-stage juvenile agrees well with descriptions of the species. Criconema annuliferum (de Man, 1921) Raski & Luc, 1984 (Fig. 25) Material examined. Foyers Plateau: 160 m; core 15, 19. Female. (n= 1). L = 598pm;a = ; b = ; c = 25; V = 88; R = 60; Rex = 20; Rvan = 5; Ran = 4; VL/VB = ; tail = um. Labial disc low. Head region offset, collar-like. Annule two. Fig. 25 Criconema annuliferum (de Man, 1921) A-C, female. A. habitus; B. anterior region; C, posterior region. Criconema sp. D, E, female. D, anterior region; E, posterior region. Scale bars a = 100 um. b = 30 um. slightly smaller and narrower than annule three, both distinctly smaller than annules one and four. Annules um wide at mid- body, outer edges smooth, rounded or slightly retrorse; interspaces sometimes filled with fine detritus. Spear straight, 101 um long; knobs um wide, anterior surfaces indented. Vulva closed, anterior lip well developed, overlapping entire posterior lip. Ovary not reflexed, oocytes arranged in two rows. Spermatheca not observed. Anus inconspicuous. Tail terminus peg-like. Dis
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