CYTHERELLA. 



73 



7. Cytherella obliquata, G. S. Brady, MS. Plate Vll, figs. 5 a — d. 



Carapace suboblong, or oblong with round ends, which are nearly but not quite equal 

 in curvature ; moderately convex, compressed forward and thick behind, giving an acute- 

 ovate profile, and a suboval end-view. Surface smooth, marked with two oblique 

 indentations in the antero- dorsal region. 



Length "52 ; height "36; thickness '24 mm. Proportions 13 : 9 : 6, 

 From the Carboniferous Shales at Capelrig Quarry,^ Lanarkshire. Li Mr. D. 

 Robertson's collection. 



8. Cytherella nuciformis, Jones. Plate VII, figs. 14 a — c. 



Cythere (Cytherella?) nuciformis, /o?«es. In King's Monogr. Perm. Foss., Pal. 



Soc, 1850, p. 64, pi. 18, figs. 1 1 a—c. 

 Cytherella nuciformis, Reuss. Jahresb. "Wetterauer Ges., 1854, p. 68, f. 9. 



— — Richie)-. Zeitsch. deutsch. geol. Gesell., vol. vii, 1855, 



p. 529, pi. 26, figs, 8, 9. 

 Cythere — Jones. In Kirkby's Permian Entomostraca, Trans. Tyne- 



side Nat. Field-Club, vol, iv, 1859, p. 40, pi. 11, 

 figs. 7 a — c. 



— — Geinitz. Dyas, 1861, p. 31, figs. 1 a — h. 



We include this little Permian species among the Carboniferous series, because of the 

 intimate relationship of the fossils of the two formations. It has a subovate, smooth 

 carapace, rather straighter on one edge than on the other; the profile is compressed- 

 ovate, truncate posteriorly ; end-view suboval, nearly round. 



Length "28; height "16; thickness '12 mm. Proportions 7:4:3. 



Permian : Byer's Quarry, Sunderland ; and in Germany, near Hanau and near 

 Saalfeld. 



In King's ' Monogr. Permian Poss.,' p. 63, another doubtful species was referred to 

 as ""Cythere {Cytherella?) inornata, M'Coy ;" and this has been quoted by Ricliter 

 ('Zeitsch. d. g. Ges.,' vii, 1855, p. 529) as " Cytherella inornata, M'Coy," and by our- 

 selves (' Trans. Tynes. P. Club,' iv, 1859, p. 160) as " Cythere inornata, M'Coy." We 

 very much doubt if it be a Cytherella ; and we are certain that M'Coy's " Cythere 

 inornata " is a dwarf form of Leperditia Okeni (see ' Ann. Mag. Nat. Hist.,' ser. 3, 

 vol, xviii, 1866, p. 44). Should this Permian species ultimately prove to be a 

 Cytherella, it will stand as C. inornata, Richter. 



1 'Catal. W.-Scot. Fossils,' 1876, p. 79. 



K 



