. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monographic Survey of South African Non-marine Mollusca. 293 narrowly but closely reflexed, sometimes completely obliterating the minute rima. Alt. 19-2, lat. 10-4; apert. alt. 11-1, lat. 6-8; last whorl 16-2 mm., but the shell is frequently of rather more slender contour. Hab. CAPE PROVINCE. Glenavon Falls, Somerset East (Miss Bowker). Type set in British Museum. Jaw arcuate, about 1*7 mm. wide, composed of about 18 irregular radial laminae; radula (text-fig. 24) measures about 4 x 1'2 mm. when fl
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monographic Survey of South African Non-marine Mollusca. 293 narrowly but closely reflexed, sometimes completely obliterating the minute rima. Alt. 19-2, lat. 10-4; apert. alt. 11-1, lat. 6-8; last whorl 16-2 mm., but the shell is frequently of rather more slender contour. Hab. CAPE PROVINCE. Glenavon Falls, Somerset East (Miss Bowker). Type set in British Museum. Jaw arcuate, about 1*7 mm. wide, composed of about 18 irregular radial laminae; radula (text-fig. 24) measures about 4 x 1'2 mm. when flattened, formula (45 + l+45)xl60 + n; central and admedians with simple r Text-fig. 24.—Prestonella bowkeri (Sow.), cones; an ectocone ap- Somerset East. pears in line 13 of the Representative teeth from radula; x400. laterals and an endocone in line 15; from here outwards the teeth are tricuspid, diminishing in size, outermost rudimentary. Prestonella nuptialis (M. & P.). Ref. List No. 322. 1894. Buliminus nuptialis M. & P., , xiv, p. 92, pi. i, f. 5. Smaller than the foregoing, corneous yellow-brown, with more convex whorls, of which there are 4, sculptured after the 1st with straight, regular, slightly oblique growth riblets, varying a little in strength, and hardly a vestige of micro- spiral grooving; other features as in bowkeri. Alt. 16-0, lat. 8-1; apert. alt. 9-5, lat. 5-9; last whorl 13-5 mm. Hab. CAPE PROVINCE. Craigie Burn, Somerset East (type, Mrs. Barber); Elandsberg Mountain, Cradock (Farquhar). Type in British Museum. Prestonella quadingensis Conn. 1929. Prestonella quadingensis Conn., Ann. Natal Mus., vi, p. 233, pi. xiv, f. 25. Closely resembles the last species, from which it differs in very slightly more obese contour and its sculpture, which consists after the first 1£ whorl of fairly close, strong, straight growth lines crossed by weaker, much closer, microspiral ridgelets. The type, with 4 convex whorls, measures Alt. 12-3, lat
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
