MOLLUSCA FROM THE GREAT OOLITE. 



EMARGINULA SOALARIS, Sow. Plate VIII, figs. 4, 40, b, c. 



EMARGINULA SCALARIS, Sow. 1826. Min. Con., t. 519, figs. 3, 4. 



Brown. 1847. Illust. FOBS. Conch., p. 103, t. xlviii, fig. 5. 



Bronn. 1848. Index Paleeont., p. 456. 



D'Orb. 1850. Prod. Paleont., p. 303. 

 1 Deal. 1842. Mem. Soc. Lin. Norm. vii. p. 125. 



E. Testdparvd, conicd; ambilu suborbiculari; apice plus minusve postico; costis loevibus 

 radiantibus et transversis decussantibus ; rimd elongatd laid. 



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 Minchinhampton ; at the latter place it is very rare : Langrune. 

 Trance. 



Family PATELLID^E. 



PATELLA, Linnceus. 1758. 



PATELLAKIA, Lhwyd. Lith. Brit. Ich. 

 HELCION, D'Orbigny. 



Shell ovately conical, with an oblong or oval base ; apex subcentral, or inclining towards 

 the anterior side ; internal surface smooth ; muscular impression horse-shoe shaped ; margin 

 of the aperture entire. 



PATELLA CINGULATA, Gold/. Plate XII, figs. 4, 4a d. 



PATELLA CINGULATA, Goldfuss. 1843. Petref., t. 177, fig. 11. 

 HELCION D'Orb. 1850. Prod. Paleont., p. 358. 



P. Testa conicd, ambitu ovali, vertice subacuto, elato, erecto, antemediano; striis conccn- 

 tricis confertis irregularibm. 



Shell conical, base oval, apex subacute, elevated, erect, placed anterior to the middle 

 line of the shell, with encircling, irregular, closely-arranged striae. 



This may be regarded as one of the most abundant and characteristic of the Patellae 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. 



