. Bulletin of the British Museum (Natural History), Geology. B. Fig. 48 Camera lucida drawings of adoral pore arrangement. A, 'Globator' bleicheri (Thomas & Gauthier), BMNH EE4187; B, Conulus douvillei (Cotteau & Gauthier), BMNH EE4309. Scale bar = 1 mm. 47A), but towards the peristome they become weakly arcuate and reduce in pore-diameter size (Figs 47B, 48A). There are about 88 pore-pairs in a column at 18 mm test length, rising to 127 at 32 mm test length (Fig. 46). Plates are compound in the pyrinoid style, with a single small demiplate in each triad (Figs 47A, B). All plate suture


. Bulletin of the British Museum (Natural History), Geology. B. Fig. 48 Camera lucida drawings of adoral pore arrangement. A, 'Globator' bleicheri (Thomas & Gauthier), BMNH EE4187; B, Conulus douvillei (Cotteau & Gauthier), BMNH EE4309. Scale bar = 1 mm. 47A), but towards the peristome they become weakly arcuate and reduce in pore-diameter size (Figs 47B, 48A). There are about 88 pore-pairs in a column at 18 mm test length, rising to 127 at 32 mm test length (Fig. 46). Plates are compound in the pyrinoid style, with a single small demiplate in each triad (Figs 47A, B). All plate sutures are denticulate. The periproct is large and tear-drop shaped, pointed adapi- cally (PI. 20, figs 7, 10). It lies on the posterior surface relatively high on the test, so that it is visible when viewed from above, but not from below. Periproct height is 28-46% of the test height (mean = 36%, SD = 4-6%, N = 29) and periproct width is 56-80% of its height (mean = 65%, SD = 5-8%, N = 27). The distance from the base of the periproct to the base of the test is 38-62% of the test height (mean = 49%, SD = 5-6%,N = 31). The peristome is oblique and broadly fusiform in outline, with the long axis running from interambulacrum 3 to ambu- lacrum I (PI. 20, fig. 6). There is hardly any invaginated lip SMITH developed around the peristome, although the oral surface does curve inwards towards the periproct slightly. Tuberculation is uniform throughout, with semi-regular and slightly sunken primary tubercles scattered over the surface, surrounded by a very dense miliary granulation. There is no internal butressing. Remarks. This species is easily distinguished from the other species of Conulidae, Conulus douvillei, that occurs here. C. douvillei has a periproctal opening that lies close to the base of the test, whereas the periproct in G.' bleicheri lies high on! the posterior and is separated by a considerable distance from the base. This is not a size-related character since there is c


Size: 1431px × 1746px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll