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Show 300 MR. A. GARRETT ON THE TERRESTRIAL [Mar. 1, I am inclined to believe that T. pacifica, Pease, from the Caroline Islands, is identical with T. valida. 2. TRUNCATELLA RUSTICA, Mousson. Truncatella rustica, Mousson, Journ. de Conch. 1865, pl. 14. fig. 8; Paetel, Cat. Conch, p. 118; Schmeltz, Cat. Mus. Godeff. v. p. 104 ; Pfeiffer, Mon. Pneum. iv. p. 14. Truncatella costellifera, Pease, Proc. Zool. Soc. 1871, pp. 468, 477; Pfeiffer, Mon. Pneum. (Auric.) iv. p. 16. I found a few examples of this species at Taviuni, associated with T. vitiana. It was also obtained at Wallis Island ( = " Uvea"), where Dr. Graffe found the type specimens. Mr. Pease's T. costellifera, which Mr. Brazier obtained at Vavau, Tonga Islands, is undoubtedly the same as T. rustica. It is smaller (6 to 7 millim. long), more slender, the aperture not so large, and the ribs less numerous (20 to 25), and the basal keel is more conspicuous than in T. valida, and is continuous with the large rib just behind the peristome, which gives the latter a duplicated appearance. The colour corneous or ruddy corneous. 3. TRUNCATELLA CEYLANICA, Pfeiffer. Truncatella ceylanica, Pfeiffer, Proc. Zool. Soc. 1856 ; Mon. Auric. (Appendix) i. p. 186; H. Nevill, Enum. Pneum. Ceyl. 1871, p. 6 ; Tennent's Ceylon, i. p. 239. Truncatella teres, Pfeiffer, Proc. Zool. Soc. 1856, p. 336; Mon. Auric. (Appendix) i. p. 188 ; Cox, Mon. Austr. Land-Shells, p. 92, pl. 15. figs. 9, 9a, 9b; Paetel, Cat. Conch, p. 118. Truncatella semicostata, Montrouzier, Journ. de Conch. 1862, p. 243, pl. 9. fig. 10 ; Pfeiffer, Mon. Pneum. iii. p. 6 ; Gassies, Faune Nouv. Caled. p. 73, pl. 8. fig. 2 ; Paetel, Cat. Conch, p. 118 ; Schmeltz, Cat. Mus. Godeff. v. p. 104. Truncatella cerea, Gassies. Truncatella nitida, Gassies. W e obtained many thousand specimens, in all stages of growth, near high-water mark at Ovalau Island. This species may be distinguished by its rather thin shining texture and more or less evanescent riblets, which are either well developed on all the whorls, or entirely absent except at the sutures, where they are reduced to plicate crenulations. Sometimes the crenulations disappear, so that the shell is perfectly smooth and polished. Some examples have the upper whorls ribbed, and the lower one smooth or crenulated at the suture and base. Having lately received from my esteemed correspondent, Mr. E. L. Layard, of New Caledonia, a lot of Truncatella ceylanica from Ceylon, together with T. teres from the Comoro Islands, and many examples of T. semicostata from New Caledonia, and after a critical comparison of the three species, I have failed to discover a single specific character to separate one from the other. Dr. Cox records T. teres from N.E. Australia. Through the courtesy of the Rev. Montrouzier of New Caledonia, |
