. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monographic Survey of South, African Non-marine Mollusca. 297 nearly uniform cream or pale buff, with a beautiful band of bright rose around the inner margin of aperture and up the columella, broadly diffused over the entire paries. I have, however, seen on one example traces of a thin dark brown periostracum, which probably covers the shell before weathering, resembling in this respect the more northerly races. The spire is broadly conoid, apical angle nearly 90°, apex very small, broadly subacute
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monographic Survey of South, African Non-marine Mollusca. 297 nearly uniform cream or pale buff, with a beautiful band of bright rose around the inner margin of aperture and up the columella, broadly diffused over the entire paries. I have, however, seen on one example traces of a thin dark brown periostracum, which probably covers the shell before weathering, resembling in this respect the more northerly races. The spire is broadly conoid, apical angle nearly 90°, apex very small, broadly subacute; whorls 6|, moderately convex, rapidly increasing, the earlier practically smooth, later showing the granulation typical of the subfamily above the periphery, below which there are fairly strong, very close vertical striae with little or no spiral sculpture. Aperture subovate, peristome slightly thickened, labrum vertical and nearly straight in profile, colu- mella straight, erect, margin narrowly triangularly reflexed over the rima; callus pink and continuous. The shell described measures Alt. 109, lat. 71; apert. alt. 67, lat. (extern.) 46; last whorl 87 mm. Hab. S. RHODESIA. Near the Amanze Inyama River (type, Penther); Salisbury (Oakley); Insiza (French); Victoria Falls (Soper); Sawmills; Nyamandhlovu (Arnold); Battlefields (Parkinson); Umtali (Kidwell); Omvuma (Miss Smith); Zimbabwe; Shangani (Williamson). Type in Vienna Museum. Fairly common in Northern Rhodesia; Watson and Peile report that there is no special feature in the anatomy or radula to suggest specific distinction from some q | 20 50 63'4- 65 of the northern races. The radula (text-fig. 26) of a specimen from Broken Hill measures 16x9 mm. when flattened out, formula (83 + 1 + 83) x 110 + nascent, outer- Text-fig. 26.—Burton nilotica (Pfr.) . var. arnoldi btur. o m J Representative teeth from radula; x 115. small and almost indistin- guishable. The first lateral appears tricuspid, though the inner process do
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
