Title: Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum Identifier: annalsofsoutha4719637sout Year: 1898 (1890s) Authors: South African Museum Subjects: Natural history Publisher: Cape Town : The Museum Contributing Library: Smithsonian Libraries Digitizing Sponsor: Biodiversity Heritage Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Text Appearing Before Image: 142 ANNALS OF THE SOUTH AFRICAN MUSEUM Nucleus of protoconch decollated in all examples even the smallest (19 mm.), apparently naturally because the hole has been filled with a shelly plug. Decollation may occur a little later, and the hole plugged. Number of protoconchal whorls probably ij. Postnatal whorls in 45 mm. shell 11 remaining, probably 5 missing; in Type 13, probably 3 missing. Profile of whole shell straight, of each whorl sigmoid. First 5 whorls with 2 spiral lirae in lower half, on 3rd whorl a 3rd Text Appearing After Image: Fig. 27. Abyssochrysos melanioides Tomlin. a, apical whorls, b, profile of later whorl, c, head and mantle of animal, d, inner view of portion of mantle showing oviduct, anal papilla and gill, e, radula teeth, and margin of buccal armature. A. tomlini n. sp. /, apical whorls. lira appears in upper half; on 6th whorl, another lira appears in lower half; the uppermost lira continues, but becomes evanescent on later whorls, the lov/er 3 lirae may increase to 4 or even 5, but all become more or less evanes- cent on the last 2 or 3 whorls. Axial riblets c. 18-20 on 1st and 2nd whorls, decreasing to 14 on later whorls, on last (16th) or last two (15th and 16th) becoming less regular, and with duplications sometimes numbering 16-18; protractively curved on early whorls, becoming straighter on middle whorls, and again curved on last two or three whorls; small tubercles at intersections with the lirae, especially the upper- most lira, obsolescent on the lower lirae as these become obsolete. Note About Images 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 work.