. Bulletin of the British Museum (Natural History), Geology. 9n â â 115 HH:. tbht Figs 115-118 Semielea vieilbanci (d'Orbigny, 1850). 115-117, BMNH D36151, 'Senonian', Lavardin, Loir-et-Cher, France; 115, autozooids arranged in transverse rows, x 60; 116, autozooids, kenozooids and an eleozooid (centre) close to a branch bifurcation, x 100; 117, autozooidal aperture with terminal diaphragm, x 340. 118, BMNH D59371, Turonian, Lavardin, overgrowth origin, x 135. S. dichotoma, and both species of Semielea differ from cavariiform colonies of Reptomultelea spp. in the consistently parallel orientat
. Bulletin of the British Museum (Natural History), Geology. 9n â â 115 HH:. tbht Figs 115-118 Semielea vieilbanci (d'Orbigny, 1850). 115-117, BMNH D36151, 'Senonian', Lavardin, Loir-et-Cher, France; 115, autozooids arranged in transverse rows, x 60; 116, autozooids, kenozooids and an eleozooid (centre) close to a branch bifurcation, x 100; 117, autozooidal aperture with terminal diaphragm, x 340. 118, BMNH D59371, Turonian, Lavardin, overgrowth origin, x 135. S. dichotoma, and both species of Semielea differ from cavariiform colonies of Reptomultelea spp. in the consistently parallel orientation of the long axes of the zooids and the tubular branches. Distribution. Turonian northern France. (?Upper) - Lower Santonian, Semielea dichotoma (d'Orbigny, 1851) Figs 123, 124 1851 Diastopora dichotoma d'Orbigny: pi. 638, figs 6-8. 1853 Semielea dichotoma (d'Orbigny); d'Orbigny: 637. 1890 Semielea dichotoma (d'Orbigny); Pergens: 393. 1912 Meliceritites dichotoma (?) (d'Orbigny); Levinsen: 38, pi. 5, figs 1 and 2. Material. Lectotype: MNHN d'Orbigny Collection 8194 (Figs 123-124), specimen labelled as 'type' by E. Voigt, Voigt Photocard No. 8321, Senonian [?Coniacian], Tours, Indre et Loire, France. This specimen, a fragment 21 mm long which resembles but does not exactly match plate 638, figure 6 of d'Orbigny (1851), is one of several specimens of various species contained in six tubes and registered as 8194. No other material is available for study. E. Voigt (in litt. April 1984) states that 'Although I have got much material from Tours, I have never found this species in the French Turo- nian'. Description. Colony tubular (cavariiform) with bifurcating branches (Fig. 123) about 2-3 mm in diameter. Overgrowths not observed. Organization fixed-walled. Zooid apertures variously arranged, often irregular. Autozooids (Fig. 124) with short frontal walls. Apertures large, frontally elongate or equidimensional, closely-spaced, well-rounded distally; apertural rims thick and pro
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