88 MOLLUSCA FROM THE GREAT OOLITE. 
EMARGINULA scaLARIs, Sow. Plate VIII, figs. 4, 4a, 4, c. 
EMARGINULA SCALARIS, Sow. 1826. Min. Con., t. 519, figs. 3, 4. 
_ _ Brown. 1847. Illust. Foss. Conch., p. 103, t. xlviii, fig. 5. 
— — Bronn. 1848. Index Paleont., p. 456. 
— — D’ Orb. 1850. Prod. Paléont., p. 303. 
7 _ Desl. 1842. Mem. Soc. Lin. Norm. vii. p. 125. 
E. Testé parva, conicd ; ambitu suborbiculari; apice plus minusve postico ; costis levibus 
radiantibus et transversis decussantibus; rima elongata latd. 
Shell small, conical; base nearly circular; apex elevated, more or less posterior ; ribs 
radiating, smooth, transversely crossed by others. The radiating ribs are narrow, but 
are somewhat larger than those which are transverse; the mesial radiating rib bifurcates 
near the margin, forming a lengthened and wide fissure. 
Locality. Ancliff and Minchmhampton ; at the latter place it is very rare: Langrune, 
France. 
Family—PATELLIDE. 
PateLua, Linneus. 1758. 
Paretiaria, Lhwyd. Lith. Brit. Ich. 
Hetcion, D’ Orbigny. 
Shell ovately conical, with an oblong or oval base ; apex subcentral, or inclinmg towards 
the anterior side ; internal surface smooth ; muscular impression horse-shoe shaped ; margin 
of the aperture entire. 
PaTELLA CINGULATA, Goldf. Plate XII, figs. 4, 4a—d. 
PaTELLA cINGuLATA, Goldfuss. 1843. Petref., t. 177, fig. 11. 
HELCION — D' Orb. 1850. Prod. Paléont., p. 358. 
P. Testa conicad, ambitu ovali, verticé subacuto, elato, erecto, antemediano; striis concen- 
tricis confertis irregularibus. 
Shell conical, base oval, apex subacute, elevated, erect, placed anterior to the middle 
line of the shell, with encircling, irregular, closely-arranged striz. 
This may be regarded as one of the most abundant and characteristic of the Patelle of 
the Great Ooolite. It occurs in all the shelly beds, but more especially in the white stone 
of Eastcombs and Bussage, near Brimscombe. The dimensions vary from the size of a 
duck-shot to a diameter of seven lines; and, from the great thickness of the shell, it is 
usually well preserved. The height is equal to two thirds of the longer basal diameter. 
