. Bulletin of the British Museum (Natural History), Geology. I04 R. H. BATE. Fig. 9. Left side, male carapace, Cloiightonella rugosa sp. nov. Paratype, , approx. X95- Dimensions Holotype, , female carapace (PL 3, figs. 1-4 ; Text-fig. 8), length 0-53 mm. ; height 0-34 mm. ; width 0-28 mm. , male carapace (PL 3, figs. 5-7 ; Text-fig. g), length 0-55 mm. ; height 0-28 mm. ; width 0-26 mm. , male carapace (PL 3, figs. 12, 13), length o-6i mm. ; height 0-33 mm. ; width 0-26 mm. , female left valve (PL 3, fig. 11), length 0-48 mm. ; height 0-32 mm. , male c
. Bulletin of the British Museum (Natural History), Geology. I04 R. H. BATE. Fig. 9. Left side, male carapace, Cloiightonella rugosa sp. nov. Paratype, , approx. X95- Dimensions Holotype, , female carapace (PL 3, figs. 1-4 ; Text-fig. 8), length 0-53 mm. ; height 0-34 mm. ; width 0-28 mm. , male carapace (PL 3, figs. 5-7 ; Text-fig. g), length 0-55 mm. ; height 0-28 mm. ; width 0-26 mm. , male carapace (PL 3, figs. 12, 13), length o-6i mm. ; height 0-33 mm. ; width 0-26 mm. , female left valve (PL 3, fig. 11), length 0-48 mm. ; height 0-32 mm. , male carapace (PL 3, fig. 10), length 0-54 mm. ; height 0-29 mm. ; width 0-22 mm. , female carapace (PL 3, figs. 8, 9), length 0-51 mm. ; height 0-32 mm. ; width 0-26 mm. , male right valve, length o-6o mm. ; height 0-29 mm. Remarks. Cloughtonella rugosa is close to the genus Aulacocythere in outline but as mentioned under remarks for the genus does not possess the generic characters of the latter. The present species is also close to Procytheridea hoffmanni Brand, which can, however, be distinguished by the strongly arched dorsal margin in the left valve ; presence of a definite accommodation groove and in the more positive ornamentation. The two species are probably congeneric however. Genus FUHRBERGIELLA Brand & Malz 1962. Subgenus PRAEFUHRBERGIELLA Brand & Malz 1962 Fuhrbergiella [Praefuhrbergiella) horvida Brand & Malz. Remarks. Brand & Malz (1962 : 19) described a new subgenus Praefuhrbergiella with Fuhrbergiella (P.) horrida as type species. Two subspecies were introduced : Fuhrbergiella [P.) horrida horrida having a range of romani to blagdeni Zones and Fuhrbergiella {P.) horrida bicostata typically developed in the Sonninien-Schichten [sowerbyi to grandis Zones) but also occurring in the Coronaten-Schichten (pinguis Zone). The subspecies recorded here from the Grey Limestone Series is Fuhrbergiella (P.) horrida horrida. Fuhrbergiella {Praefuhrbe
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