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Show ,806 MR. E. A. SMITH ON MARINE SHELLS [Nov. 5, the Andaman Islands, as the type shells were described as East- Australian. The specimen before me, which is apparently adult, has a length of 21 millims., and the last whorl is 4 in diameter. The costaa (about 18 on a whorl) are thickest at the upper extremity, above the sulcus which parts off the infrasutural belt, gradually attenuating downwards, and at length become quite obsolete at the extreme base of the body-whorl. 7. MUREX (MURICIDEA) CIRROSUS, Hinds. Hab. Straits of Macassar (Hinds). Some small specimens of this charming shell were dredged by Capt. Wilmer, one of which possesses an unusually long canal. 8. MUREX (MURICIDEA) RUSTICUS, Reeve. (Plate L. fig. 5.) Hab. 1 I feel uncertain whether the Andamanese shell is without doubt the same species as that figured by Reeve. It agrees very well with the description, but exhibits some difference from the figure, which is very coarsely executed. The number of transverse ridges is greater, the*mouth a little smaller; and the fronds, although a little broken and worn, would not I think, if perfect, be as long as those represented in the figure. 9. MUREX (MURICIDEA) BARCLAYANA, H. Adams. Coralliophila barclayana, II. Ad. P. Z. S. 1873, p. 205, pl. 23. fig. 1. Hab. Mauritius (H. Ad.). The Andamanese specimen of this species, the type of which is now in the British Museum, is only 21 millims. in length, yet apparently full-grown. Its coloration is much less brilliant than the representation of the described shell, being pale pinkish white, with the lateral varix and the termination of the canal tinged with brown, the aperture being light purple. 10. MUREX (OCINEBRA) BREVICULUS, Sowerby, Proc. Zool. Soc. 1840, p. 146; Conchol. Illustr. fig. 37. M. tetragonus, Reeve (non Broderip), Conch. Icon. iii. fig. 118. Hab. ? A single, much worn, yet undoubted example of this species is valuable as indicating the habitat of so interesting a form. Reeve considers it a short variety of Broderip's M. tetragonus, the figure he gives of the latter representing a typical breviculus. M. tetragonus proper is well figured by Sowerby in his ' Conchological Illustrations,' fig. 25. Judging from the specimens of the two species which I have examined, all of them unfortunately in a more or less worn and faded condition, I am of opinion that they are specifically distinct. Besides the much stouter and less-produced form of M. breviculus, its aperture is larger and more circular, white or slightly blotched with brown far within ; the transverse costae, especially on the obtuse varices, are also brown. M. tetragonus, on the other |