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The Atoll of Funafuti, Ellice group : its zoology, botany, ethnology and general structure based on collections made by Charles Hedley of the Australian Museum, Sydney, N.S.W.
Triforis Incisus, Pease. — (Fig. 33)
Triforis Incisus, Pease.
(Fig. 33).
Tryon, loc. cit., p. 190, pl. xxxix., fig. 65.
The inadequate description and poor figure quoted, suggest, but fail to demonstrate, that a shell figured herewith should be so named. The species is represented by a single, perforated and decollated example from the Funafuti lagoon. It is 5½ mm. in length, has thirteen whorls remaining, and in colour is ochraceous splashed with white. The last whorl has six spiral ridges, two of which are basal; the three preceding whorls have each three, and those above each two such ridges. The ridges are smooth, elevate and keeled, the anterior of each series the larger; on the upper
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whorls the posterior ridge tends to divide into beads. The interstices are broad, deep and finely spirally grooved. The spur of the outer lip crosses the pillar. Anal notch deep and cordate. Canal short and perpendicular.
Fig. 33.
Pease described T. incisus from Hawaii.* I have collected at Port Moresby, British New Guinea, what seems a form of that described above. It differs in colour being variegated with black, chocolate and white. The uppermost ridge has not the same disposition to become beaded but longitudinal plications are developed in the interstices. The protoconch in these Papuan shells is six whorled, bicarinate and crossed by coarse bars., like the apex I figure for T. obesula.
* Pease—Proc. Zool. Soc, 1860, p. 434.