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Show 420 MR. E. A. SMITH ON SHELLS FROM ADEN. [June 16, 169. TROCHUS (TECTUM) DENTATUS, Forskal. Hab. Red Sea, Persian Gulf. Both the typical form and the variety (T. noduliferus, Lamk.) occur at Aden. Of the latter some specimens are very large, being 69 millim. in height and 100 across the base. In these very fine examples the nodules at the periphery become somewhat obsolete upon the last third of the whorl towards the outer lip. Their operculaare 37 millim. in diameter, thin, yellowish brown, and consist of 12 whorls which enlarge somewhat rapidly. 170. TROCHUS (INFUNDIBULOPS) ERYTHR^EUS, Brocchi. Hab. Red Sea, Gulf of Suez. 171. TROCHUS (INFUNDIBULOPS) FIRMUS, Philippi. Hab. Persian Gulf. 172. TROCHUS (EUCHELUS) ATRATUS, Gmelin. Hab. Widely distributed. Many parts of the Indian and Pacific Oceans. 173. TROCHUS (CLANCULUS) PHARAONIS, Linn. Hab. Red Sea, Gulfs of Suez and Akaba. 174. TROCHUS (MONODONTA) AUSTRALIS, Lamarck. Hab. Natal, Seychelles, Madagascar ; Gulf of Suez. All the specimens from South Africa which I have seen have stronger spiral sulci and ridges than the examples from Aden. These are nearly smooth, but precist ly similar in style of colouring. 175. FISSURELLA RUPPELLII, Sowerby. Hab. Mauritius, Red Sea, East Africa, Mergui. 176. PATELLA CHITONOIDES, Reeve. Hab. Madagascar, Mauritius, Reunion. 177. CHITON (ACANTHOPLEURA) SPINIGER, Sowerby. Hab. Suez (Lssel) ; Aden (Haddon) ; also widely distributed in the Pacific and Indian Oceans. 178. CHITON (ISCHNOCHITON) YERBURYI. (Plate XXXIII. fig. 6.) Testa parva, depressa, in medio leviter carinata, pallide sordido-viride maculata ; arece laterales, centrales antica undique sub&qualiter reticulatce ; apex valva posticce subcentralis, mediocriter acutus ; ligamentum squamis indutum, roseo-griseum, sordido-viride maculatum. J^ongit. 15 millim., diam. 8. Only a single specimen of this species was found by Major Yerbury. The sculpture recalls that of a thimble. It is a trifle coarser on the lateral, especially along their posterior margins, than on the |