. Bulletin of the British Museum (Natural History), Geology. 178 SMITH. Fig. 41 Camera lucida drawings of plating in Echinotiara perebaskinei Lambert. A, BMNH EE3769, ambulacrum from apex (top) to peristome margin (bottom); B, BMNH EE3763, ambulacrum from apex (top) to peristome margin (bottom); C, ambital ambulacral and interambulacral plate, BMNH EE3763. Scale bar = 1 mm. buccal notches are small but distinct. The perignathic girdle structure is seen in BMNH EE3783 and EE3788. It consists of two long peg-like auricles that do not meet above the perradius. Spines and lantern are unknown.
. Bulletin of the British Museum (Natural History), Geology. 178 SMITH. Fig. 41 Camera lucida drawings of plating in Echinotiara perebaskinei Lambert. A, BMNH EE3769, ambulacrum from apex (top) to peristome margin (bottom); B, BMNH EE3763, ambulacrum from apex (top) to peristome margin (bottom); C, ambital ambulacral and interambulacral plate, BMNH EE3763. Scale bar = 1 mm. buccal notches are small but distinct. The perignathic girdle structure is seen in BMNH EE3783 and EE3788. It consists of two long peg-like auricles that do not meet above the perradius. Spines and lantern are unknown. Remarks. This species lacks crenulate tuberculation, although preservation is usually inadequate to be certain for most specimens. It could easily be mistaken for Orthopsis miliaris on account of its very similar tuberculation and test shape. However, Orthopsis has perforate tuberculation and its ambulacral pore-pairs are strictly uniserial, not arranged in arcs of three as in Echinotiara. Furthermore, Echinotiara has well-developed phyllodes that are never seen in Orthopsis. The type material described and illustrated by Lambert differs in apparently having slightly less well developed phyllodes adorally at comparable sizes, but for the present the two populations are treated as conspecific. Cohort IRREGULARIA Latreille, 1825 Order HOLECTYPOIDA Duncan, 1889 Family HOLECTYPIDAE Lambert, 1899 Genus COENHOLECTYPUS Pomel, 1883 Coenholectypus inflatus (Cotteau & Gauthier, 1895) PI. 18, figs 7-11; Figs 42, 43A, C 1895 Holectypus inflatus Cotteau & Gauthier: 73, pi. 12, figs 1-4. 71989 Holectypus (Caenholectypus) inflatus Cotteau & Gauthier; AH: 401, fig. 4(1). Types. The specimen described and illustrated by Cotteau & Gauthier, from the late Cretaceous of Aftab, southern Iran. Material studied. Thirty specimens, of which 16 were used in the biometric analysis (BMNH E82644, EE3399, EE3401-04, EE3406-07, EE3409, EE3411-15, EE3417, EE3429). Occurrence. There are two mo
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