. Bulletin of the British Museum (Natural History), Geology. LATE CAMPANIAN-MAASTRICHTIAN ECHINOIDS 237 HU â ⦠Test width Test height 30 â â â â â â â â â ⦠⦠⦠20 ⦠⦠⦠in â â i 12 14 12 Sio 5 8 â 6 ⢠24 26 28 30 32 Test length (mm) â Anterior to apical disc ⦠Anterior to peristome 11 ? 5 13 â C1 |,2 (V N-* â « 11 8. â â¢Sio f 9 0) â â â â 8 . 24 26 28 30 Test length (mm) 32 34 â â £ S ⢠o â¢2 e a â â â¢S â â -C â 22 24 26 28 30 32 Test length (mm) 34 24 26 28 30 32 Test length (mm) 34 : Fig. 82 Biometric data for Mecaster victoris (Lambert).. Fig. 83 C
. Bulletin of the British Museum (Natural History), Geology. LATE CAMPANIAN-MAASTRICHTIAN ECHINOIDS 237 HU â ⦠Test width Test height 30 â â â â â â â â â ⦠⦠⦠20 ⦠⦠⦠in â â i 12 14 12 Sio 5 8 â 6 ⢠24 26 28 30 32 Test length (mm) â Anterior to apical disc ⦠Anterior to peristome 11 ? 5 13 â C1 |,2 (V N-* â « 11 8. â â¢Sio f 9 0) â â â â 8 . 24 26 28 30 Test length (mm) 32 34 â â £ S ⢠o â¢2 e a â â â¢S â â -C â 22 24 26 28 30 32 Test length (mm) 34 24 26 28 30 32 Test length (mm) 34 : Fig. 82 Biometric data for Mecaster victoris (Lambert).. Fig. 83 Camera lucida drawings of plating in Mecaster victoris (Lambert). A, apical surface, BMNH EE4050; B, oral surface, BMNH EE4049. Scale bar = 2 mm. Description. The specimen is not well preserved but retains sufficient features to be able to place it generically. The test is 32-5 mm in length, 30-5 mm in width (93% of length) and 24 mm in height (74% of length). It is heart-shaped in outline with a squarely truncated posterior and a rather deep anteal sulcus, approximately 2-5 mm deep (7% of test length). The anteal sulcus is relatively broad and deepens gradually away from the apex. In profile the test is rather flat above and below and has a rounded anterior and steep posterior. The apical disc is ethmolytic and gonopores are large, those on either side almost touching (Fig. 84B). It lies well anterior of the centre, the anterior gonopores being 38% of the test length from the anterior border. The posterior ocular plates are separated by the posteriorly elongated madreporite plate. The antero-lateral ocular plates project and hardly indent the adjacent genital plates. The anterior sulcus has small isopores that are not crowded together. The anterior petals are 13-5 mm in length and I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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