Some hydroids (Hydrozoa: Hydroidolina) from Dampier, Western Australia: annotated list with description of two new species. Author Watson, Jeanette E. text Memoirs of Museum Victoria 2012 2012-12-31 69 355 363 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-69-2012/pages-355-363/ journal article 10.24199/j.mmv.2012.69.09 1447-2554 12212553 Diphasia digitalis Busk, (1852) Figure 3B, C Sertularia digitalis Busk, 1852: 387 , 393. Diphasia digitalis (Busk) .– von Lendenfeld, 1885a: 415 , 633.– Bale, 1884: 101 .– Bale, 1915: 265 .– Jäderholm, 1920: 4 .– Billard, 1931: 249 .– Vervoort, 1972: 99 .– Pennycuik, 1959: 191 .– Millard, 1975: 257 .– Watson, 1996: 78 .– Watson 2000: 14 , fig. 10A, B.– Schuchert, 2003: 166 , fig. 25. Material examined. WAM Z31867. Two broken infertile stems, the longer 22 mm ; microslide, malinol mount. Description. Hydrorhiza creeping, stolons tubular. Stems sparingly branched, proximal athecate stem segment long, tubular, with a strong distal hinge joint. Hydrothecae paired, one pair per internode, nodes transverse, indistinct to absent, marked only by a narrowing of internode. Hydrotheca long, tubular, expanding from base to margin, free adcauline wall convex, abcauline wall concave. Margin quadrangular, with a low abcauline cusp and an indistinct longitudinal pleat extending downwards from margin, fading out near base of hydrotheca. Remains of operculae visible inside many hydrothecae. Perisarc smooth.