is spreading outwards; columella callosity broad, almost flat, white with usually two purple spots on it, sculpture of five spiral rows or rounded tubercles, the two upper ones being the most prominent; color pale fawn. This is a fairly common species low on rocky shores especially in crevices under overhanging rocks, etc (Yankson and Kendall, 2001). Thais haemostoma (see Stramonita haemastoma described on this site). Thais forbesi shell height is about 25–35 mm, width somewhat less and aperture about half height of shell. It is not usually toothed; spire somewhat pointed; two or three spiral rows of pointed tubercles. This species is grey to brown in color, often overgrown; and inside of the aperture is grey(Yankson and Kendall, 2001). Thais callifera has a shell height of 30 – 70 mm, with width slightly less, aperture notched near suture as well as below; body whorl large, spire short and blunt, sculpture two or four rows or rounded tubercles, color pale fawn, inside of aperture pale orange. This species has been recorded in Nigeria and Cameroun. Shells may sometimes be confused with Thais haemostoma, but are paler and fatter (Yankson and Kendall, 2001). Rotula sp. (Echinodermata: West African sand dollar) have the appearance of flattened sea urchin. They are circular to heart shaped in outline and little more than the thickness of a coin in depth. A mat of flat lying spines covers them. Sand dollars bury into intertidal sand leaving a characteristic mark at the sediment surface. This species had been recorded in Ghana though rare (Yankson and Kendall, 2001). Other species found on the West Africa shore such as sea anemone, Perna perna, Ocypode cursor, Diadema antillarum have already been described on this site. See also Rocky shores References Edmunds, J. (1978). Sea shells and other molluscs found on West African coast and estuaries. Arakan Press Ltd. Accra. 146pp. Gauld, D. T. and Buchanan, J. B. (1959). The principal features of the rock shore fauna in Ghana. Fasc. Oikos 1 (10): 121-132. Lamptey, E., Armah,A.K and Allotey, L.C. (2000). Spatial Assemblages of Tropical Intertidal Rocky Shore Communities in Ghana, West Africa. Environmental Science, Engineering and Technology. Yankson, K. and Akpabey, F.J. 2001. A preliminary survey of the macro-invertebrate fauna at Iture Rocky Beach, Cape Coast, Ghana. Journal of Natural Sciences, 1: 11-22. Yankson, K. and Kendall, M. (2001). A student's Guide to the Fauna of Seashores in West Africa. Darwin