MOLLUSCA FROM THE CRAG. 
2 
aS 
~ 
Spec. Char. Testa ovatd subtrigonuld, subinequilaterali, tenui, levi, compressiusculd ; 
margine dorsali conveaiusculo ; dentibus lateralibus remotis, levigatis, acutis, tenuibus ; 
foved cardinali magna ; sinu palliari semicirculari. 
Shell ovate, slightly trigonular, nearly equilateral, thin and smooth, somewhat 
compressed ; dorsal margin slightly curved; lateral teeth remote, smooth, sharp, and 
thin; cartilage pit large; palleal sinus semicircular. 
Length, 3% inches. Height, 23 inches. 
Locality. Red Crag, Newbourn. Recent, Mediterranean, British Channel. 
This species, in the recent state, seems restricted to the warmer parts of the British 
Seas, and to the Mediterranean, and as such we might have expected to have found it 
in the lower Crag deposit. Two specimens were found by myself in the genuine, though 
rather disturbed portion of the, Red Crag: there is, I think, little doubt of its having 
been an inhabitant of the sea of this latter Period, as so large and thin a species 
would hardly have escaped destruction in a removal from one formation to another. 
M. stultorum is the shell with which it is most likely to be confounded; that 
species, however, never attains to so great a magnitude. The dental characters in 
this are strongly marked; the right valve has two unequal sized cardinal teeth, the 
anterior one short, inside of which the A-formed tooth of the left valve interlocks; 
the lateral teeth are long, thin and sharp, rather less elevated towards the sides than 
are those of JZ. stultorwm, and in this species the umbo is rather more prominent: the pit 
for the cartilage is of a triangular form, and the mantle sinus is comparatively less. 
Born seems intitled to priority, as there is very little doubt his figure, though 
not a good one, was intended for this species, and to which Chemnitz (who has given 
a much better representation) has referred. 
Menke has introduced this species into his ‘ List of New Holland Mollusca.’ This 
Australia shell may be what is called by some authors its representative. 
2. Macrra sTuLTORUM, Linneus. Tab. XXIII, fig. 3, a—d. 
Macrra stutrorum. Gualteri. Ind. Test. Conch., t. 71, fig. c, 1742. 
PrectuncuLus. Leigh. Nat. Hist. Chesh., pl. 3, fig. 6, 1700. 
CaRpium stuLtorum. Linn, Syst. Nat., ed. 10, p. 681, No. 8. 
Macrra stuttorum. Linn. Syst. Nat., ed. 12, p. 1126, No. 99, 1767. 
— -- Broce. Conch. Foss. Subap., p. 535, No. 2, 1814. 
—- — Phil. En. Moll. Sic., vol. i, p. 10, t. 3, fig. 2, 1836. 
= = Forb. and Hanl. Hist. Brit. Moll., vol. i, p. 362, pl. 22, figs. 4—6. 
— cinerea. Mont. Test. Brit. Supp., p. 35, 1808. 
— MAGNA. Woodw. Geol. of Norf., p. 43, t. 2, fig. 10, 1833. 
—  sTRAMINEA? Desh. 2d ed. Lamk. tom. vi, p. 100, 1835. 
TRIGONELLA RADIATA. Da Costa. Brit. Conch., p. 196, pl. 12, fig. 3, 1778. 
TELLINA RADIATA, Penn. Brit. Zool., ed. 4, vol. iv, p. 87, pl. 49, fig. 30. 
