. Bulletin of the British Museum (Natural History). Zoology . 5o J. R. HAYNES It occurs living very abundantly on the marshes of the Dovey Estuary and also in tide pools along the Cardigan Bay coast. The same habitat of 'half tide pools' w as noted by Balkwill and Millett for X. involvens in Galway. Family NUBECULARIIDAE Jones, 1875 Genus SPIROPTHAL MID IUM1 Cushman, 1927 Spiropthalmidium acutimargo var. emaciatum Haynes n. var. (PI. 5, fig. 11; PI. 9, fig. 16; Text-fig. 10, nos 1-4) Spiroloculina acutimargo Brady, 1884 : 154, pi. 10, fig. 14; Balkwill & Wright, 1885 : 323, fi
. Bulletin of the British Museum (Natural History). Zoology . 5o J. R. HAYNES It occurs living very abundantly on the marshes of the Dovey Estuary and also in tide pools along the Cardigan Bay coast. The same habitat of 'half tide pools' w as noted by Balkwill and Millett for X. involvens in Galway. Family NUBECULARIIDAE Jones, 1875 Genus SPIROPTHAL MID IUM1 Cushman, 1927 Spiropthalmidium acutimargo var. emaciatum Haynes n. var. (PI. 5, fig. 11; PI. 9, fig. 16; Text-fig. 10, nos 1-4) Spiroloculina acutimargo Brady, 1884 : 154, pi. 10, fig. 14; Balkwill & Wright, 1885 : 323, fig. i; Heron-Allen & Earland, 1913b : 24, pi. 1, fig. 8 (not Brady, fig. 13). Spirophihalmidium acutimargo Cushman, 1949 : 16, pi. 2, figs 14, 15; Voorthuysen, i960 : 246, pi. 10, fig. 8. ? Spiroloculina sp. abnorm. Barker, i960 : 20, pi. 10, fig. 14. Diagnosis. An elongate variety of Spiropthalmidium acutimargo up to four times as long as wide. Later chambers overlapping with slightly raised flaps. Aperture produced and tubular with phialine lip. Description. (Holotype, PI. 5, fig. 11; PL 9, fig. 16.) Test elongate-ovate, almost parallel sided with narrow tubular apex, much compressed and blade-like, periphery produced into a wide keel, about three times as long as wide; chambers arranged in a spiroloculine spiral after an initial, undivided, tubular portion, in- creasing moderately in size and becoming strongly embracing as added, wrapped 1 Original spelling by Fig. 10, 1-4. Spiropthalmidium acutimargo var. emaciatum. 1, 2, side and edge view of slender specimen showing considerable taper to the apex; 3,4, specimens with apertures Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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