This fine species most nearly resembles Vivipara ussuriensis, Gerst.; but the last whorl is more inflated, and the surface of the shell is not malleated or lirate. It is the largest species yet discovered on the Australian continent. We have great pleasure in dedicating it to F.G. Waterhouse, Esquire, who, under great difficulties during the expedition, succeeded in making many valuable additions to science.
2. Vivipara kingi, Adams and Angas.
V. testa turbinata, globoso-conica, umbilicata, spira mediocri erosa nodulosa, epidermide tenui pallide fusco-viridi obtecta, ad apicem purpurascente; anfractibus convexis, lineolis transversis et longitudinalibus elevatis decussatis, anfractu ultimo ad basin sulcis impressis spiralibus instructo; apertura ovata, antice subeffusa; labio vix reflexo.
Long. 1 inch, lat. 8 lines.
Habitat. King's Ponds, Arnhem's Land (Coll. Angas).
This is a neat, finely-decussated, concolorous species, with the upper whorls nodulous from erosion, as in Vivipara praerosa, Gerst. It is named after Mr. Stephen King, one of the gentlemen who accompanied the expedition.
3. Melania (Melasma) onca, Adams and Angas.
M. testa fusiformi-turrita; spira elata, conica; epidermide pallide olivaceo induta, rufo-fusca, pulcherrime maculata, maculis saepe in lineis undulatis longitudinalibus dispositis; anfractibus planis, longitudinaliter plicatis, plicis aequalibus regularibus subdistantibus, ad suturas nodulosis; apertura oblongo-ovata, antice effusa; labio subincrassato; labro simplici, acuto.
Long. 1 inch, lat. 4 lines.
Habitat. Tributary of Adelaide River, Arnhem's Land (Coll. Angas).