. The atoll of Funafuti, Ellice group: its zoology, botany, ethnology, and general structure based on collections made by Mrs. Charles Hedley, of the Australian museum, Sydney, N. S. W. Rissoa invisibilis, sp. nov. (Fig. 9). Shell small, sturdy, conic ovate. Colour white. Whorls four. Sculpture— distant, longitudinal, sharp costse are crossed by three similar spiral ribs, which together divide the surface into nearly square compartments ; at the intersections are small projections. One spiral ridge alone appears on the Fig. 0. penultimate whorl, both it and the longitudinals vanish on the whor
. The atoll of Funafuti, Ellice group: its zoology, botany, ethnology, and general structure based on collections made by Mrs. Charles Hedley, of the Australian museum, Sydney, N. S. W. Rissoa invisibilis, sp. nov. (Fig. 9). Shell small, sturdy, conic ovate. Colour white. Whorls four. Sculpture— distant, longitudinal, sharp costse are crossed by three similar spiral ribs, which together divide the surface into nearly square compartments ; at the intersections are small projections. One spiral ridge alone appears on the Fig. 0. penultimate whorl, both it and the longitudinals vanish on the whorl above. The base is flattened, umbilicus narrow and deep. Aperture round, columella slightly sinuate, recurved over the umbilicus, lip with a heavy varix. Length 1-15, breadth -63 mm. One specimen from the sand of the lagoon shore. Shape and sculpture ally this to the group including R. trajectus, Watson. The heavy lip, open pattern of ornament, and com- parative breadth of the shell clearly distinguish the novelty, one of the smallest of the genus, from any known form. Rissoina exasperata, Souverbie. (Fig. 10). Souverbie, Journ. de Conch., xiv., 1866, p. 259, pi. ix., tig. 10. To this species is referred with doubt a series from Funafuti. The published account is insufficient for accurate determination, and my principal reason for considering the Ellice shell to be R. exasperata is its identity with a common New Caledonian shell which I have myself collected at Panie, , and have received from Noumea, from Mr. R. C. Rossiter. That Conchologist regards it as R. ex- asperata, and it answers fairly to Souverbie's description as far as that goes, but it is less easy to reconcile it with his figure. This figure, perhaps drawn from a worn specimen, was so badly copied by Weinkauff * as to almost eliminate the name character and represents a smooth exasperata. Tryon unfortunately appears. Fi<?. 10. * Conchylien Cabinet, i., 22, 1885, p. 54, pi. xiv., fig. Please note th
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