BIVALVIA. 41 



are the following : L. Elea, D'Orb., from the Supraliasic Sands ; L. Electra, D'Orb., 

 from the Supraliasic Sands and the Inferior Oolite ; L. Hector, D'Orb., Inferior Oolite ; 

 L. Luciensis, D'Orb., Great Oolite; L. rudis, Sow., Coralline Oolite j L. rotundata, 

 Buv., Coralline Oolite; L. anc/usta, Buv., Coralline Oolite. 



Lima punctatilla, Lye. Tab. XL, fig. 32. 



Lima punctatilia, Lye. Ann. and Mag. Nat. Hist., 1853, p. 420. 



Testa parva, injlata, ovato-ohlonga, auricuUs parvts mhcequalibm, lateribus leviter 

 excavatis ; costis radlantihus {circa 24) elevatis, (/ranulatis, intcrstiis angustis, striis eon- 

 centricis crebris decussatis. 



Shell small, inflated, ovately oblong ; auricles small and nearly equal, the sides of the 

 valves steep and slightly excavated ; radiating (costse about 24), elevated, granulated ; large 

 upon the centre of the valves, and degenerating upon the sides into lines, decussated by 

 closely arranged concentric striations. 



The general figure resembles Lima gibbosa, but more convex, and with radiating lines 

 or delicate costae upon the sides, which increase in size symmetrically towards the middle 

 of the valve, each rib being ornamented with a minute line of granules. The specimen 

 figured is of less dimensions than others, but it has only occurred very rarely. 



Geological Position and Locality. The Great Oolite of Minchinhampton ; the Inferior 

 Oolite of Leckhampton Hill, in the shelly freestone. 



Lima Helvetica, OppeL Tab. XXXIII, figs. 8, 8 a. 



Lima gibbosa, Goldfuss. Pet., t. 102, fig. 10, p. 86, non Sow. 

 — Helvetica, Oppel. Juraformation, p. 489. 



Lima testa fornicata ovata subobliqua antice declivi, costis (25 — 27) subacutis adpressis 

 et linea laterali nofatis, sulcis confortnibus, lunula lavi convexa. (Goldfuss.) 



Shell ovately oblong, convex, slightly oblique ; anterior slope lengthened, steep ; pos- 

 terior slope more gradual and flattened; umbones acute, straight; anterior and posterior 

 auricles equal and but little produced, forming a short horizontal hinge-line ; radiating 

 costge upon the middle portion of the valves narrow, sub-acute, 25 — 27 in number at the 

 loAver border, 14 — 15 near to the umbo, the additional costae near to the lower border 

 consisting of smaller intervening costse or lines, unequal in size, and rather irregularly 

 arranged ; the larger costse towards the sides of the valves appear as if compressed upon 

 the shell. The anterior sides of the valves are nearly smooth, but each side has a few 

 very delicate radiating lines ; the entire surface of the valves has very delicate, closely 

 arranged, concentric, irregular striations, which impress the costae, and are very con- 

 spicuous upon the wide, flattened intercostal spaces ; the valves are close fitting and thin. 



6 



