. Bulletin of the British Museum (Natural History), Geology. . Figs 62-63 Riyadhella regularis Redmond; primary types of the synonymous R. nana Redmond, from Saudi Arabia, Aramco Well T 60A, 100- 105 ft depth, upper Middle Dhruma Formation, mid or late Bathonian. Fig. 62, holotype of R. nana, AMNH FT-1288; axial view (length 370 urn), x 190. Figs 63a-e, paratype of R. nana, AMNH FT-1289, now sectioned; a, original axial view (length 390 urn), x 250; b, apertural view, x 1,000; c, oblique axial view, x 300; d, terminal view, x 500; e, axial section, x 160. Riyadhella arabica Redmond, 1965 Fig.
. Bulletin of the British Museum (Natural History), Geology. . Figs 62-63 Riyadhella regularis Redmond; primary types of the synonymous R. nana Redmond, from Saudi Arabia, Aramco Well T 60A, 100- 105 ft depth, upper Middle Dhruma Formation, mid or late Bathonian. Fig. 62, holotype of R. nana, AMNH FT-1288; axial view (length 370 urn), x 190. Figs 63a-e, paratype of R. nana, AMNH FT-1289, now sectioned; a, original axial view (length 390 urn), x 250; b, apertural view, x 1,000; c, oblique axial view, x 300; d, terminal view, x 500; e, axial section, x 160. Riyadhella arabica Redmond, 1965 Fig. 66 1965 Riyadhella arabica Redmond: 136; pi. 1, fig. 35. Remarks. Only the holotype of this taxon was deposited by Redmond in the American Museum of Natural History, so the species cannot properly be redescribed. Also, the aper- ture is obscured on the holotype by a coating of calcareous sediment. However, the holotype is much bigger than the specimens referred here to R. regularis, more broadly taper- ing (initially at about 40CM5°) and does not clearly become parallel-sided in the adult. The chambers are smooth-walled weakly inflated, and are about as high as broad; successive whorls embrace previous ones by about half the chambei height. R. inflata Redmond has much higher chambers, and in that species successive whorls embrace previous ones by about a quarter of the chamber height. The type specimen of R. arabica Redmond came from Riyadh Water Well 1, at 2355-2360 ft depth - the same sample as that from which the type specimens of R. elongate Redmond were obtained - and Redmond (1965) reported. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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