The land operculate mollusca collected during the 'Skeat expedition' to the Malay peninsula in 1899-1900 / by E.R. Sykes.

  • Sykes, Ernest Ruthven, 1867-1954.
Date:
1903
Catalogue details

Licence: In copyright

Credit: The land operculate mollusca collected during the 'Skeat expedition' to the Malay peninsula in 1899-1900 / by E.R. Sykes. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    brunnect, strigis cornels picta, fascia unica nigro-brunnea ad peripheriam ornata ; anfr. 4^, mediocriter crescentes, convexi, sutura bene notata separati; apertura subcircular is, peri- stomate indistincte duplicate, ala parva antice angulato. Alt. 8; diam. max. 16 millim. Ilab. Gunong Inas, at 5000 feet. I thought at first that this might be a form of P. blandi Bens., but it appears to be smaller, more elevate and not so widely umbilicated, and to differ in colour. In the two specimens that I have seen the lip is duplicated only on its outer margin, and the wing is small and thin. Rhiostoma jalorensis, sp. nov. (Plate XX. figs. 6-8.) Nearly related to R. housei but larger, slightly more depressed, and with the whorls not so tightly coiled. The tube is long and large, reaching the body of the shell, and is bent slightly back- wards at the junction. The disjoined portion of the last whorl is much longer than is the case in R. housei, as will be seen from the figure, and is more descending. The colour resembles that of R. housei, and a dark band is usually present at the periphery. Operculum as usual. Diam. max. 29 millim. Hah. Limestone Hills and Oaves, Biserat, Jalor. I have been in some doubt as to whether this is not a local race of R. housei, but the differences are constant in the specimens examined and, I think, are of specific value. The porcellaneous appearance of the operculum, so often seen in this group, appears to be due to the wearing down of the outer layers. Rhiostoma, sp. Hah. Kwala Aring, Kelantan. A single specimen which agrees well with R. jousseaumei De Morgan, save that the tube is placed a little further back from the mouth, and is thinner and more cylindrical. It appears safer, however, to await further material ere describing this form. Opisthoporus penangensis Stol. Opisthoporus penangensis Stoliczka, J. As. Soc. Bengal, vol. xlii. pt. 2, p. 265, pi. x. fig. 7. Hub. Kwala Aring, Kelantan. A single specimen, which I refer to this species with some doubt. Rhaphaulus ascendens, sp. nov. (Plate XX. figs. 11, 12.) Testa pupoidea, anguste umbilicata, fusco-purpurea, dense costu- lato-striata, spira bene elevata, apice obtusulo ; anfr. 6, plano- convexi, penultimus gibbosus; apertura subcircular is, intus pallide fusca; peristoma pallide corneum, expansum et reflexum, marginibus callo junctis ; tubulus brevis, incrassatus, a sutura oblique ascendens. Alt. 18 5 ; diam. max. 9*5 millim. Hob. Patalung.
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