. Bulletin of the British Museum (Natural History), Geology. 176 R. A. FORTEY & R. M. OWENS Discussion. Novakella is a very rare genus, and the holotype of the new species is one of the best preserved specimens known. N. copei is easily distinguished from the type species, N. bergeroni, from the Llanvirn Sarka Formation of Bohemia and the Hope Shales, Shropshire (Marek 1961: 50-52; pi. 4, figs 10-15; Whittard 1961a: pi. 23, fig. 5), which has an extended glabellar 'nose' making the cranidium longer than wide, and a semicircular, rather effaced pygidium. Novakella incisa Whittard, 1961a (:1
. Bulletin of the British Museum (Natural History), Geology. 176 R. A. FORTEY & R. M. OWENS Discussion. Novakella is a very rare genus, and the holotype of the new species is one of the best preserved specimens known. N. copei is easily distinguished from the type species, N. bergeroni, from the Llanvirn Sarka Formation of Bohemia and the Hope Shales, Shropshire (Marek 1961: 50-52; pi. 4, figs 10-15; Whittard 1961a: pi. 23, fig. 5), which has an extended glabellar 'nose' making the cranidium longer than wide, and a semicircular, rather effaced pygidium. Novakella incisa Whittard, 1961a (:170; pi. 23, fig. 6) is known from a single speci- men from the Hope Shales; compared with the holotype of N. copei the glabella is less broadly rounded anteriorly and clearly defined posteriorly; the 3P glabellar furrows are more strongly forward-directed; the pygidium has a narrow, more gently tapering axis and six pairs of clearly-defined pleural furrows. However, it should be noted that Whittard's holotype is smaller than ours, and it is likely that the relative depth of the furrows, for example, is a function of size; our smaller cranidium is more like N. incisa in its cephalic furrows (Fig. 52c). The difference in cranidial outline, and the shape and width of the pygidial axis, may be better specific characters. A smaller specimen of N. copei from the Lake District supports this; it is poorly preserved, but it shows that the pygidial axis was like that of copei rather than incisa at this size, and the glabellar front is broadly rounded. Genus PROSPECT A TRIX Fortey 1981 Type species. Cyclopyge genatenta Stubblefield 1927, by original designation. Diagnosis. See Fortey 1981: 611. Prospectatrix cf. superciliata (Dean 19736) (Fig. 53) cf. 19736 Pricyclopyge superciliata Dean: 314-316; pi. 6, figs 2, 4, 6, 8, 9, 14. Type locality and horizon. Sobova Formation, Taurus Mountains, Turkey; late Arenig. Occurrence in Wales. Pontyfenni Formation, Upper Arenig, Fennian, biozone of Be
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