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Show 518 DR. A. GUNTHER ON A ZOOLOGICAL [June 23, 7. Littorina moluccana, Philippi. 8. Littorina picta, Philippi. 9. Littorina granicostata, sp. n. *10. Neritaplicata, Linn. *11. Nerita maxima, Chemnitz. *12. Turbo lajonkairei, Deshayes. 13. Succinea solidula, Pfeiffer. 14. Succinea solitaria, sp. n. 15. Melampus luteus, Quoy and Gaimard. 16. Melampus fasciatus, Deshayes. SUCCINEA SOLIDULA, Pfeiffer1. This species has never been figured nor has a locality been previously assigned to it. The two specimens from Christmas Island agree in every respect with the types described by Pfeiffer in M r . Cuming's collection. There are two principal features which distinguish this form, namely, the thickened peristome and the peculiar sculpture. The latter has the appearance (under a lens) of the texture Fig. 1. 1, 2. Succinea solidula. 3, 4. Succinea solitaria. of very fine linen, or minute crisscross lines, rather than of minute granulations as described by Pfeiffer. Besides this excessively fine ornamentation the surface exhibits rather strong lines of growth or subplications. The thickening of the peristome is slight but evident, and internal, hence Pfeiffer's expression " perist. submar-ginatum." SUCCINEA SOLITARIA, sp. n. Shell rather obliquely ovate, acuminate above, rather solid, reddish at the apex, paler on the second whorl and wax-white' on the last ; sculptured with very 6trong ridges of growth and coarse spiral striae ; volutions 3, very rapidly enlarging, two first very convex, the last sloping above and less rounded, oblique; aperture roundly 1 Proc. Zool. Soc. 1849, p. 134; Monogr. Hel. vol. iii. p. 22. |