. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Paheuzoi'c Bivalved Entomostraca. 179 belong to the Cjtheridse or to the Cjpridid£e it is often difficult to say ; but the genus Cythere comprises very few of the smooth subovate forms, and none that have toothless hinges. Hence we find that a real Cythere is scarcely known in Pakeozoic strata; and when the term is applied to such old forms it is in a very general and probably artificial sense. 1. Macrocypris Vinei, sp. nov. (PI. IV. figs. 1, 2, 3 J and woodcut.) 1882. ''' Bai
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Paheuzoi'c Bivalved Entomostraca. 179 belong to the Cjtheridse or to the Cjpridid£e it is often difficult to say ; but the genus Cythere comprises very few of the smooth subovate forms, and none that have toothless hinges. Hence we find that a real Cythere is scarcely known in Pakeozoic strata; and when the term is applied to such old forms it is in a very general and probably artificial sense. 1. Macrocypris Vinei, sp. nov. (PI. IV. figs. 1, 2, 3 J and woodcut.) 1882. ''' Bairdia elongata, Munster(?)," Vme, Quart. Journ. Geol. Soc. vol. xxxviii. p. Macrvci/i>ris Vinei, sp. nov. Thick variety ( § ?). Magn. 26 diam. Vine Coll. lxv,. Bed no. 46. Length. Height. Thickness. C Fig. 3: 41 14 13 r» ,• * ) Woodcut: 40* 13 lroportions*:^pjg_j. 3^- ^3 ^^ (Fig. 2: 33 10 9^ Measurements of some specimens in lOOOths of an inch :— Length. Height. Thickness. 80 29 25 Vine Coll. Bed no. 40. 80 23 20 Vine Coll. Bed no. 46. 75 27 22 Vine Coll. Bed no. 46. 65 24 18 Smith Coll. Railway, Ironbridge. Carapace smooth, nearly equivalved, elongate, subcylin- drical, tapering at each end; rounded and compressed in front, obliquely acute at the postero-ventral extremity ,• arched above, nearly straight below. In some cases the dorsal edges fall in a little, so that tlie middle of the back is slightly flat- tened. The ventral edge of the left valve slightly overlaps its fellow, and sometimes an overlap by the right valve on the dorsal edge is discernible, but not so strong as in most of the recent species. Some indications of a rose-shaped muscle- spot are visible. 1868; the "Monograph of thePost-Tertiary Entomostraca," &c., by Brady, Crosskey, and Kobertson, Palteont. Soc, 1874 ; and Dr. Bradv's "Report on the Ostracoda of the 'Challenger' Expedition," 1880, • If these proportioual ininibers be divided by I'o, tlie res
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