. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 596 Annals of the South African Museum. Assiminea (?) lugubris Turton. (Text-fig. 55.) 1932. Assiminea lugubris Turton, Marine Shells of Port Alfred, p. 154, pi. xxxv, f. 1095. Shell very small, globose, imperforate, smooth, glossy, corneous brown, columella, except at extreme base, white and glossy. Spire short, sides rounded, apex minute, mamillate. Whorls 3, convex, rapidly increasing, practically sculptureless, suture simple, not deep. Aperture nearly circular, slightly angulate at top, peri
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 596 Annals of the South African Museum. Assiminea (?) lugubris Turton. (Text-fig. 55.) 1932. Assiminea lugubris Turton, Marine Shells of Port Alfred, p. 154, pi. xxxv, f. 1095. Shell very small, globose, imperforate, smooth, glossy, corneous brown, columella, except at extreme base, white and glossy. Spire short, sides rounded, apex minute, mamillate. Whorls 3, convex, rapidly increasing, practically sculptureless, suture simple, not deep. Aperture nearly circular, slightly angulate at top, peristome simple, labrum straight and scarcely receding in profile, columella concave, white and glossy until Text-fig. 55. near its extreme base, slightly thickened but not truncate or Assiminea (?) reflexed. Operculum ?. lugubris Turton. Alt. 2-1, lat. 1-75; apert. alt. 1-32, lat. 1-02; last Type in Oxford wh0rl 1-94 mm. Museum; x 8. Hab. CAPE PROVINCE. Port Alfred (Turton). Type in Oxford University Museum. Order Aspidobranchia. Nervous system little concentrated. Pedal centres long ganglion- ated cords, to anterior ends of which pleural centres are attached; cerebral ganglia widely separated, and united by a long commissure lying in front of buccal mass and salivary glands. An infra-oeso- phageal commissure is present; osphradium little specialised, situate on branchial nerve; otocyst containing numerous otoconia. Ctenidia nearly always present, bipectinate and free at distal ends. As a rule the Aspidobranchia exhibit well-marked traces of original bilateral symmetry, usually having 2 auricles to the heart. Suborder Rhipidoglossa. Aspidobranchia with dialyneurous nerve system; osphradium single except in genera with 2 ctenidia; 1 or 2 hypobranchial glands. Radula with numerous slender marginal teeth. Family HYDROCENIDAE. Shell small with exerted spire, operculum with apophysis. No ctenidium, but a pulmonary cavity present; foot obtuse; tentacles short; heart with a single auric
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
