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Fig. 19 | Swiss Journal of Palaeontology

Fig. 19

From: Crinoids from the Middle Jurassic (Bajocian–Lower Callovian) of Ardèche, France

Fig. 19

Topmost columnals of Cyrtocrinus praenutans n. sp., Lower Bathonian, La Pouza. a Proximal view of cup with low pentagonal columnal on thin plates in the aboral cavity of cup, two radials have pits, M10954. b Higher columnal, b1 upper facet with central depression, b2 lower facet with short strong crenulae, M10961. c Cone-shaped partly angular columnal, c1 distal facet, c2 proximal facet with irregular short crenulae, M10963. d High columnal with oval upper part, d1 proximal facet with wide depression, d2 lateral, d3 distal facet with irregular crenulae, M10965. e Aboral view of cup with bulging radials and oval columnal, M10956. f Upper facet of circular columnal with central depression surrounded by five sloping facets with additional depressions, lower facet with a few short crenulae, M 10847. g Oval columnal with pit at both narrow ends, M10910. h Low saddle-shaped oval columnal, h1 proximal facet with a few irregular crenulae, h2 lateral, h3 distal facet with long crenulae, M10966. i Saddle-shaped columnal, i1 proximal facet (distal facet is similar), i2 lateral, M10964. j Lateral view of high columnal with sloping proximal facet at an angle of approximately 45° to the cup, M 10967. k Aboral view of cup with columnal attached at an angle, lower facet of columnal with strong long crenulae, M10955. l Slightly asymmetric cup with triangular, wedge-shaped topmost columnal (arrow), M10991. m Nearly symmetric cup with attached high columnal (small topmost columnal may be hidden), M10992. n Small conical columnal, n1 lower facet, n2 upper facet with wide axial canal, M10999. Scale bars 1 mm

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