Figure 4

Nicaisolopha nicaisei (Coquand, 1862) from the Campanian successions of the Wadi Tarfa and Wadi Umm Omeiyied sections, in the North Eastern Desert, Egypt. (a,d) External views of right valves from the El-Rakhiyat Formation in the Wadi Tarfa section. (b,e,h,i) External views of left valves from the El-Rakhiyat Formation in the Wadi Tarfa section. (c) Internal view of the right valve from the El-Rakhiyat Formation in the Wadi Tarfa section. (f,g) External views of left valves from the El-Rakhiyat Formation in the Wadi Umm Omeiyied section. The bar scale is equal to 10 mm.