. Bulletin of the British Museum (Natural History), Botany. 37. 39 40 Figs 35-^0 Figs 35-36: Rulilaria schenkii, valve view, x 1000, CAS 104089, Cantua Creek, Fresno County, California, , holotype. Figs 37-38: Rutilaria delicatula, valve view, x 1000, BM 36335, Inza, Ulyanovsk oblast, Russia. Fig. 38: holotype. Figs 39-40: Rutilaria hyalina, valve view, x 1000, BM 36335, Inza, Ulyanovsk oblast, Russia, holotype. parte exteriori c. |xm alta, seriebus tribus advalvaribus areolarum c. 40 in 10 |xm ornata; copula III parte exteriori c. |xm alta, serie una advalvari areolarum c. 45 in
. Bulletin of the British Museum (Natural History), Botany. 37. 39 40 Figs 35-^0 Figs 35-36: Rulilaria schenkii, valve view, x 1000, CAS 104089, Cantua Creek, Fresno County, California, , holotype. Figs 37-38: Rutilaria delicatula, valve view, x 1000, BM 36335, Inza, Ulyanovsk oblast, Russia. Fig. 38: holotype. Figs 39-40: Rutilaria hyalina, valve view, x 1000, BM 36335, Inza, Ulyanovsk oblast, Russia, holotype. parte exteriori c. |xm alta, seriebus tribus advalvaribus areolarum c. 40 in 10 |xm ornata; copula III parte exteriori c. |xm alta, serie una advalvari areolarum c. 45 in 10 ixm ornata. Typus. In BM 36335 ex stratis palaeocaenicis ad 'Inza, Ulyanovsk oblast,' Rossiam. Frustules 8-10 |xm deep. Valves with a slightly convex valve face, depressed at the centre, with rounded apical elevations |xm tall, |xm long; valves 12-60 |xm long, jxm wide, with a sub-circular to elliptical central portion tapering into narrow projections )xm broad. Mantle separated from the valve face by a sharp angle, vertical, c. |xm deep, hyaline. Central area circular to elliptical, 2-5 p-m in diameter. Areolae c. p-m in diameter, in radially fasciculate striae or irregularly arranged, areolae and striae 22-30 in 10 (j,m. Periplekton with a circular stem (Jim in diameter, |xm tall, up to |xm from that of the sibling valve; ring sub-circular, 4-6 |xm in diam- eter, not clasping the stem of the sibling periplekton closely, the arms unequal, each arm with a flange c. 1 ixm wide on the proximal part, the flanges separated by a broad shallow gap, the distal part of the arms narrow, c. |xm wide, the shorter arm extending for c. 90° and hooked at the tip, the longer extending for c. 300°, its tip bent towards the valve from which it arises. Ocelli \ in diameter, transverse, inchned at c. 45° to the vertical, porelli c. 70 in 10 Marginal spines in two rows, the outer row pointed, fxm tall, along th
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