Dyakia hugonis (Pfeiffer, 1863)
“Noch höher und mit noch mehr abgesetzten Windungen als die vorige, sehr nahe den höheren Formen der folgenden.” (Martens, 1867)
Pfeiffer (1863) original descriptions on Helix hugonis – “Testa sinistrorsa, clause perforata, turbinata, solida, undique conferte et subargute granulatostriata, superne fuscula; spira conoidea, vertice obtusulo; anfr. 8, lente accrescentes, convexiusculi, supra suturam flavescentes, ultimus compresse carinatus, infra carinam inflatus, castaneus; aperture obliqua, irregulariter angulato-lunaris, intus margaritacea; peristome subsimplex, margine supero brevi, basali perarcuato, versus perforationem submcrassato et leviter dilalato.”
Martens (1867) descriptions on Nanina hugonis – “Testa sinistra, angustissime perforata, conica, acute carinata, supra et infra confertim granuloso-striata, supra pallidius, infra intensius rufo-castanea, peripheria pallide flava; spira elata, conica; anfr. 7, convexi, sutura sat profunda, ultimus infra sat convexus, carina prominente, antice haud descendens; apertura parum obliqua, lunata; peristoma rectum, acutum, margine basali valde arcuato, antrorsum producto, columellari sat declivi, ad insertionem breviter reflexo.”
Laidlaw (1963) descriptions on Dyakia hugonis - “Rather depressed pyramidal, sharply keeled, suture not impressed; whorls about 7 ½; aperture lunate; lower surface more tumid than upper; striae fine, becoming more marked on later whorls; uniformly dull brown. Diam. max. 44 mm., alt. 15 mm. This description is base on a specimen in the Royal Scottish Museum labelled “metatype”, determined by Pfeiffer. Dextral individuals are occasionally found. This species is near to janus, but has a more elevated spire.”
“Animal, pale ruddy colour with small black specklings. The dorsal lobes are very considerably reduced in size; they present a very small lappet-like left dorsal and a fringing right dorsal lobe, and no shell-lobes in the spirit-specimen.” (Godwin-Austen, 1891)
“The anatomy of Hemiplecta humphreysiana Lea, from Singapore, the type of the genus, which I have examined and alluded to before, differs widely from that of H. hugonis.” (Godwin-Austen, 1891)
“The odontophore consists of numerous teeth in the rows; the laterals very minute and unicuspid; the centrals are simple, straight sided, spear-shaped teeth without cusps: (50 . 60 . 18 . 1 . 18 . 50 or 60) and (78 . 1 . 78.). the jaw is arched with a central projection.” (Godwin-Austen, 1891)
“The generative organs are interesting because they are, as regards the amatory organ, like some other forms from the same region, and present a type not yet known to exist in India. The male organ is simple, bent on itself; the amatorial organ has at the free end, a large secretory gland, made up of five separate glands; a short muscular cylindrical part comes next, armed at the lower part with a very beautiful fine calcareous dart 3.25 millim. In length; its position is at the end of a long cylindrical open sac with rugous sides, near the base of which is the spermatheca. The albumen-gland is large, but the other parts of the generative organs present nothing that differs from the usual form.” (Godwin-Austen, 1891)
Helix hugonis – “Diam. maj. 38, min. 35, alt. 21-22 mill.” (Pfeiffer, 1863)
Type locality – “In insula Labuan” leg. H. Low (Pfeiffer, 1863)
Other localities – “Trusan” and “Niah Hills” leg. A. Everett (Godwin-Austen, 1891); “Bunguran” leg. A. Everett (E. A. Smith, 1894); “Baramflufs” (Kobelt, 1897)