Geotrochus affinis (E. A. Smith, 1894)
“This species is closely allied to T. conicoides from Borneo. It differs, however, in the whorls increasing more slowly, so that the last is but very little broader than the penultimate, whereas in T. conicoides there is considerable difference. The body-whorl in the present species is more convex beneath, the aperture is of a slightly different form, and the few spiral lirae are coarser than the Bornean shell.” (E. A. Smith, 1894)
E. A. Smith (1894) original descriptions on Trochonanina affinis – “Testa imperforate, conica, acute carinata, tenuis, fusco-cornea, subpellucida, supra vix nitida, infra polita; spira leviter concava, conica, ad apicem rotundata; anfractus 7, lente crescentes, primi tres vel quatuor laevigati, convexiusculi, caeteri minus convexi, ablique arcuatim striate, ultimus inferne convexiusculus, infra carinam excavatus, concentrice obsolete substriatus, haud descendens; aperture oblique, angulatim lunata; peristome tenuissimum, margine columellari ad insertionem incrassato, albo.”
Trochonanina affinis – “Diam. maj. 16 millim., min. 15, alt. 9; apertura 8 lata, 2.5 alta.” (E. A. Smith, 1894)
Type locality – “Bunguran” (E. A. Smith, 1894)
Other locality – “Sirhassen” (E. A. Smith, 1894)