Prothalotia baudini: Baudin's Top Shell. Shell imperforate, eonic-elongate, rather thick-whorls six 1o seven, planulate, the first hull', eroded the following whitish ornamented with sparse rosy points and angular chestnut streaks- spirally lirate, lirae eight on the penultimate whorl; last whorl subangular, depressed above; base convex, with about eight concentric lirae; aperture rhomboidal; lip simple; columella short, subnodose-truncate below. Diameter 9 mm., height 11 mm.

Height to width ratio about 3:2; periphery subangulate, whorls concave; imperforate; with eight spiral cords on the base, two or three immediately above the periphery, cords usually obsolete on upper part of the whorls. Typically patterned with brown, reddish or greenish oblique-axial stripes alternating with white or pale fawn stripes, and heavily spotted with rose flecks, especially on the periphery.

Prothalotia baudini: The King Island in Bass Straits

Testa imperforata, conico-elongata, crassiuscula; anfractus 6-7 planulati, primi lutescentes, erosi; reliqui albidi, strigis angulatis, castaneis et punctis roseis, sparsis ornate, spiraliter cingulati, cingulis circiter 8 in penultimo anfractu; anfractus ultimus subangulatus, superne depressus, infra convexus et liris concentricis circiter 9 notatus; apertura rhomboidea, labro simplici, columella brevi, inferne subnodoso-truncata. — Longit. 11, lat. 9 mill.

T.flindersi affinis, forma graciliore, statura minore, anfractu ultimo superne depresso, umbilico deficiente, discrepans.

In Shark Bay it is abundant in seagrass beds along with C. mundula from which it may be distinguished by weaker sculpture, darker colouring and consistently closed umbilicus.

Shark Bay, Western Australia.. The type locality was given as Bass St. but that appears to have been an error. There are no records of specimens clearly referable to this species outside Shark Bay although a central west coast WA distribution seems likely.

Prothalotia baudini: Differs from P. flindersi in lacking the minute umbilical perforation, smaller size, by the depression of the upper part of the whorl and the colouration.