OCR Text |
Show 1891.] MR. E. A. SMITH ON SHELLS FROM ADEN. 403 when a very large series of specimens is examined, which will separate any of these so-called species from the rest. Sowerby (Proc. Zool. Soc. 1882, p. 120), on the other hand, observes " having had exceptional opportunities, from time to time, of examining large numbers of specimens of all the varieties, I continue to regard these last (G. abbas, G. panniculus, G. legatus, &c.) as species." 24. CONUS NUSSATELLA, Linn. Hab. Red Sea, East Africa, Ceylon, Java, Philippines, N . Australia, New Caledonia, Polynesia. 25. TEREBRA TESSELLATA, Gray. Hab. Pidang, Sumatra. This species is quite distinct from T. ligata, Hinds, with which it is united by Tryon1. It is, however, identical with T. decorata, Deshayes. Having the types of the three so-called species in the Museum, I can speak with certainty upon the subject. The specimens from Aden show that this species attains to much larger dimensions than those already quoted, the largest example having a length of 55 millimetres. 26. TEREBRA LAMARCKII, Kiener. Hab. Zanzibar ; Aden ? (Jousseaume as cluplicatu). This species is considered by Tryon and Reeve a variety of T. duplicata, Linne. The style of coloration, however, is very peculiar, and the longitudinal striae are farther apart. I prefer therefore, not having as yet met with intermediate forms, to regard them as distinct species. 27. TEREBRA (IMPAGES) C^ERULESCENS, Lamarck. Hab. Red Sea, Mauritius, Philippines, Australia, Polynesia. 28. PLEUROTOMA VIOLACEA, Hinds, var. Hab. Red Sea, Persian Gulf, Japan, Philippines, N e w Guinea, New Zealand, Australia. The specimens from Aden are unusually large, measuring as much as 27 millimetres in length and 9 in diameter. They do not belong to the typical lilac form, but are of a very light brownish tint with white spiral ridges, one of which is more conspicuous than the rest. 29. PLEUROTOMA (SURCULA) CATENA, Reeve. This species, the habitat of which was hitherto unknown, is well distinguished by the oblique white tubercles on the middle of the whorls with brownish spots between them. They become obsolete on the body-whorl, which is ornamented with oblique streaks and 1 Man. Conch, vol. vii. p. 26. |