. Bulletin of the Natural History Museum Zoology. 20 WANLESS AND R. HUNTER close to A. cyrtus Paesler, 1957 originally described from mush- room-beds of the Champignonzuchtinstitut Dieskau near Halle, Germany. sp. 3 (Fig. 31) Material examined. River Foyers: m; core 40, 1 9. Female. (n= 1). L = 813 pm; a = 52;b = ;c= ;c'= ; V = 68; tail = 50 um Head region smooth and slightly offset. Cuticle with fine striations about jam wide. Lateral fields with four lines, the inner pair indistinct and fading away in some regions. Spear um long with pronounced b
. Bulletin of the Natural History Museum Zoology. 20 WANLESS AND R. HUNTER close to A. cyrtus Paesler, 1957 originally described from mush- room-beds of the Champignonzuchtinstitut Dieskau near Halle, Germany. sp. 3 (Fig. 31) Material examined. River Foyers: m; core 40, 1 9. Female. (n= 1). L = 813 pm; a = 52;b = ;c= ;c'= ; V = 68; tail = 50 um Head region smooth and slightly offset. Cuticle with fine striations about jam wide. Lateral fields with four lines, the inner pair indistinct and fading away in some regions. Spear um long with pronounced basal thickenings. Procorpus of oesophagus hardly visible; median bulb more or less ovoid with well developed valve located slightly posterior to middle of bulb. Excretory pore about body widths posterior to median bulb. Vagina directed anteriorly. Anterior genital branch outstretched, about 290 um long. Spermatheca 58 um long with globular sperms. Postvulval uterine sac 123 um also with globular sperms. Anus distinct. Tail concoid with terminal mucro. REMARKS. This female is very similar to A. fragariae (Ritzema Bos, 1890), but differs by having more robust basal spear thickenings; described as minute but distinct in A. fragariae, Siddiqi (1975). cf. Caenorhabditis sp. (Fig. 32) Material examined. River Oich: m; core 31, 19. Horizon. Core 31 (1-2 cm). Female, (n = 1). L = 625 um; a = 30; b = ; c = ; c' = ; V = 50; tail = 105 pm. Head not offset, pm wide with minute labial papillae. Amphids not seen. Cuticle finely annulated; annules about wide at mid-body. Stoma pm long; cheilostome distinct, lightly sclerotised, barely setoff from long prorhabdions; metastome with two small denticles. Oesophageal collar not observed. Oesophagus 159 pm long with swollen midbulb. Excretory pore not seen. Ovaries paired, anterior branch reflexed. Spermatheca filled with more or less rounded sperms about diameter. Tail straight, tapering to fine tip. Phas
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