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Show 1867.] MESSRS. ADAMS AND ANGAS ON A N E W LAND-SHELL. 907 stouter than those of Hyalonema. No tentacles of the Zoanthus could be detected, the skin of the polype and the motive organs only remaining within the polypidom in a favourable condition for observation. 4. Description of a N e w Species of Land-shell belonging to the Genus Cmliaoris, H . Ad. and Angas. By H. A D A M S , F.L.S., and G. F. A N G A S , F.L.S., C.M.Z.S. (Plate XLIII.) In a paper read at the Meeting of the Society on the 10th January, 1865, we gave a description of a new species of Land-shell from the Cape of Good Hope, for which the subgeneric name Cceliaxis was proposed. Adult specimens of a second species, possessing a continuous peritreme and distinct parietal plate, have since been received by us from the Solomon archipelago, from which it would appear that Cceliaxis must be considered a distinct genus, having more affinity with Gibbulina and Ennea than with Subulina, to which we at the time referred it. Of the species upon which Cceliaxis was founded, only two examples, in the British Museum Collection, have the apertures at all complete. In one of these there is no trace of any parietal plate; while in the other, which is rather more mature, a callosity or tubercle, considered at the time accidental, exists, thus rendering it probable that in quite mature examples of this species the parietal plate will also be found distinctly developed, and the peritreme of the aperture continuous. Genus CCELIAXIS, nob. (char, emend.). Testa umbilicata, turrita, oblique costulata; spira plerumque decollata; apertura plica parietali vel tuberculo munita; perist. continuum, simplex, rectum. CCELIAXIS EXIGUA, nob. (Pl. XLIII. figs. 16, 17, p. 890.) C. testa anguste et profunde umbilicata, cylindraceo-turrita, tenui, oblicque costulato-striata, pallide fulva; spira decollata, superne attenuata; anfr. superst. 11, subplanatis, ultimo costa basali sulcum interiorem angustum formante; apertura subverticali, rhomboidea, plica parietali spirali in medio posit a; perist. simplici, continuo, soluto, margine columellari expanso. Long. 17 mill., diam. 4 mill., ap. 4 mill, longa. Hab. Solomon archipelago. <» |