. Bulletin of the Natural Histort Museum. Geology series. 140 RUSHTON AND POWELL. Fig. 14 Hesa problematica Richter & Richter, holotype; plaster cast () of cranidial fragment, showing parts of the preocular suture and anterior border, Khirbet El-Burj, Senckenberg Museum X1287a, x 4. Figs 15-18 Realaspis sp. nov., Wadi Qunai, Safi. 15a, b, abraded cranidium ; 15a. whitened, shows the interocular swelling, occipital furrow and occipital node, x ; 15b, unwhitened, shows the course of the facial suture, x 3. 16, small cranidium , x 8. 17, fragment o
. Bulletin of the Natural Histort Museum. Geology series. 140 RUSHTON AND POWELL. Fig. 14 Hesa problematica Richter & Richter, holotype; plaster cast () of cranidial fragment, showing parts of the preocular suture and anterior border, Khirbet El-Burj, Senckenberg Museum X1287a, x 4. Figs 15-18 Realaspis sp. nov., Wadi Qunai, Safi. 15a, b, abraded cranidium ; 15a. whitened, shows the interocular swelling, occipital furrow and occipital node, x ; 15b, unwhitened, shows the course of the facial suture, x 3. 16, small cranidium , x 8. 17, fragment of fixigena of large cranidium attributed to this species, showing granulation. , x 3. 18, two pygidia. (right) and 26211/2 (left), x 4. has more divergent preocular facial sutures and no interocular swelling is shown. Few bigotinid pygidia have been described, but those of the present species are unlike those of Bigotina itself (Pillola 1993: pi. 3, figs 3, 8). The holotype of Hesa problematica Richter & Richter (1941: pi. 2, fig. 7) is a fragment of a large trilobite on the same block as the holotype of Redlichops blanckenhorni. It is unsuitable to be the formal representative of a distinct genus, but shows a slightly divergent preocular suture and a frontal border (Fig. 14) striated in much the same way as our Fig. 15; it differs because the glabella seems to indent the frontal border, a difference that seems too great to be attributed to the stage of growth. Protolemts orientalis Picard (1942: 1, pi. 2, figs 1,2) was revised by Parnes (1971: 186, pi. 1, figs 1^0, who figured two cranidia, including Picard's specimen. He referred the species to Resserops (Richtewps) Hupe. 1953, though the form of the palpebral lobe is more compatible with Realaspis. Our material differs from R. orientalis in having a stronger, striated anterior border, a stronger border furrow, wider interocular fixigenae with stronger interocular swellings, and a coarser granulation.
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