. Bulletin of the Natural Histort Museum. Geology series. . Fig. 13 Paranecrocarcinus kennedyi Makatini Formation. Barremian. Zululand. South Africa. Reconstruction, based on the holotype. Fig. 7. x ca. 3, Fig. 14 Rathbunopon ? atherfieldense Lower Greensand. Crackers Bed. Lower Aptian, Atherfield, Isle of Wight. Reconstruction, omitting the granulation, based on the holotype. Fig. 9, and paratype. The orbito-frontal margins are diagrammatic, since details of fissures and teeth are not preserved, x ca. 8. Fig. 15 Paranecrocarcinus biscissits Wright & Collins. Cenomanian Lim
. Bulletin of the Natural Histort Museum. Geology series. . Fig. 13 Paranecrocarcinus kennedyi Makatini Formation. Barremian. Zululand. South Africa. Reconstruction, based on the holotype. Fig. 7. x ca. 3, Fig. 14 Rathbunopon ? atherfieldense Lower Greensand. Crackers Bed. Lower Aptian, Atherfield, Isle of Wight. Reconstruction, omitting the granulation, based on the holotype. Fig. 9, and paratype. The orbito-frontal margins are diagrammatic, since details of fissures and teeth are not preserved, x ca. 8. Fig. 15 Paranecrocarcinus biscissits Wright & Collins. Cenomanian Limestone. Whitecliff, Seaton. Devon. Diagrammatic reconstruction, based on specimen in Fig. 10. x ca. 4. Fig. 16 Wilherselta crepitans Wright & Collins. Lower Greensand, Crackers Bed. Lower Aptian, Atherfield, Isle of Wight. Diagram of left frontal margin, based on specimen in Fig. 12. x ca. 5. matrix and visible only from underneath. The cephalothorax is roughly pentagonal in outline with slightly convex anterolateral, straight posterolateral and slightly concave posterior margins. It is weakly arched in transverse and longitudinal sections, with appar- ently deeply undercut sides. The front is produced into a broad sulcate rostrum, incompletely preserved but showing upwardly directed rostral spines. The orbital margins are not well-preserved but the orbits appear to have been moderately wide with a fissured upper rim and an outer orbital spine; the orbito-frontal width was about half that of the carapace. The anterolateral margin ends in a spine at the lateral angle, and there is one between this and the outer orbital spine. The long posterolateral margins are almost straight and converge towards the slightly concave posterior margin. The cervical sulcus is bent strongly round the rear of the mesogas- tric lobe and then takes a sinuous oblique course to the margins. Distinct epibranchial sulci branch obliquely to the rear and define small triangular epibranchial lobes. The
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