. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 43o ANNALS OF THE SOUTH AFRICAN MUSEUM The protoconch agrees with Watson's description. Its extent is uncertain owing to corrosion of the surface, but i J (possibly 2) whorls would seem a reasonable estimate. The columella (pillar), however, has no kink as has the Challenger shell, and it has a very slight groove, visible on the 77 and 90 mm. apices, but dis- appearing on the basal part of the columella as seen in the fragments. The canal is not so markedly truncate as the figure of the Challenger sh
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 43o ANNALS OF THE SOUTH AFRICAN MUSEUM The protoconch agrees with Watson's description. Its extent is uncertain owing to corrosion of the surface, but i J (possibly 2) whorls would seem a reasonable estimate. The columella (pillar), however, has no kink as has the Challenger shell, and it has a very slight groove, visible on the 77 and 90 mm. apices, but dis- appearing on the basal part of the columella as seen in the fragments. The canal is not so markedly truncate as the figure of the Challenger shell would seem to suggest, even when seen in approximately the same position. Perhaps the edge of the canal was broken, but drawn by the artist as if unbroken. The fragments from the same haul as the 90 mm. apex include: a portion of the outer wall of the shell with sutural inflexion, which does not fit on to the. Fig. 5. Guivillea alabastrina (Watson), a, b, two views of columella, with (slightly enlarged) sections, c, aperture of last whorl of specimen (proto- conch + 2f whorls), showing grooved columella, d, specimen A9841 with, e, view of broken end of columella at a point opposite x, at right angles to frontal view. (All figures about f natural size.) apex as far as the latter is preserved; the canal with adjacent columella (pillar) to the upper end of which another fragment of columella appears to join (the opposed surfaces are not large enough to form an undeniable 'fit'). There is some doubt whether the 90 mm. apex and the columella fragments belong to one or two shells. Dr. Talbot tells me that the contents of the dredge when it came aboard formed such a compact mass of globigerina ooze that the extraction of the animals was difficult. Nevertheless he thinks that if a second shell (apex) had been present it would not have been Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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