BIVALVIA. 47 
additional security against any injurious lateral movement of the valves. It 
appears to differ from Z. plicata of the Touraine Beds in not being so elongated, 
and in having a broader ligamental area; and from Z. obliqua, of the Paris Basin, in 
somewhat similar characters. 
5. LIMA SUBAURICULATA, Montague. Tab. VII, fig. 3, a—e. 
PECTEN SUBAURICULATA. Mont. Test. Brit. Sup., p. 63, t. 29, fig. 2, 1808. 
_ —_— Flem. Edinb. Ency., pl. 205, fig. 12. 
OsTREA SUBAURICULATA. Twurt. Conch. Dict., p. 131, 1816. 
— = W. Wood. Ind. Test. Suppl., pl. 2, Osrrua, fig. 5. 
Lima — Turt. Brit. Biv., p. 218, 1822. 
— _- Flem. Brit. An., p. 388, 1828. 
— — Thorpe. Brit. Mar. Conch., p. 114, 1844. 
— — G. Sow. Thesaur. Conch., vol. i, p. 84, pl. 22, fig. 23. 
—_ — Phil. En. Moll. Sic., vol. ii, p. 56, 1844. 
— — Lovén. Ind. Moll. Scand., p. 32, 1846. 
_— — Alder. Cat. of Moll. North. and Durh., p. 78, 1848. 
— — Fort, and Hanl. Hist. of Brit. Moll., vol. ii, p. 263, pl. 53, 
figs. 4, 5, 1849. : 
—  suLcaTa. Brown. Illust. Conch. Gr. Brit., pl. 31, figs. 4, 5, 1827. 
— —_ Miller. Ind. Moll. Greendl., p. 16, 1842. 
OsTREA NIVEA. Broc. Conch. Subap., p, 571, +. 14, fig. 14, 1814. 
Lima — Risso. Europ. Merid., t. iv, p. 306, 1826. 
— — Desh. in Lyell’s Prine., Ist ed, vol. ii, App., p. 12, 1833. 
—_ — Nyst. Rech. Coq. Proy. d’Anv., p. 17, 1835. 
_ — Phil. En. Moll. Sic., vol. i, p. 78, 1836. 
— _ Nyst. Coq. Foss. de Belg., p. 281, pl. 21, fig. 4, 1844. 
—  svuucutus? Lovén. Ind. Moll. Scand., p. 32, 1846. 
— ELONGATA. Forbes. Agean Invert., 1843, Rep. Brit. Assoc., p. 192. 
LIMATULA sUBAURICULATA, SS. Wood. Mag. Nat. Hist., New Series, vol. iii, p. 236, pl. 3, 
fig. 6, 1839. 
— — Morris. Cat. of Brit. Foss., p. 111, 1843. 
Spec. Char. Testa elongato-ovali, equilateral, fragili, converd, in medio striatd vel 
costatd, striis rugosis, sepe obtuse angulatis, mediis binis verticalibus ; cardine recto ; auriculis 
aqualibus. 
Shell elongato-ovate, equilateral, convex, fragile, and closed all round ; costated or 
striated in the centre, becoming obsolete at the sides; striz or coste rugose, sometimes 
angulated; hinge line straight; auricles equal. 
Length, +; height, + an inch. 
Locality. Cor. Crag, Sutton and Ramsholt. 
Recent, Britain, Norway, and the Hgean Sea. 
Small specimens of this species are by no means rare in the Coralline Crag at 
Sutton; this place and Ramsholt are the only two localities from which it has as yet 
been obtained ; and there js no doubt about its identity with the recent British species. 
