BIVALVIA. ING 
Glacial of Hopton Cliff! The ZLeda hyperborea of Mr. A. Bell’s list in ‘Ann. and 
Mag., Sept., 1870, from Butley, is, I think, the above oblongordes. 
Lepa semistriata, 8. Wood. Crag Moll., vol. ii, p, 91, Tab. X, fig. 19. 
In his list in White’s ‘ Directory,’ Dr. Woodward gave, on the authority of a single 
valve in the Middleton collection, this species from the Norwich Crag. I suspect that 
this was a spurious specimen. I know this species from no newer bed than the Coralline 
Crag. 
Lepa nancnonata, J. Sow. Crag Moll., vol. ii, p. 88, Tab. X, fig. 16. 
Localities. Red Crag, Bawdsey. Fluvio-marine Crag, Bramerton. Chillesford bed, 
Chillesford. Middle Glacial, Hopton. 
A considerable fragment of this shell, exhibiting the wavy line ornamentation of the 
exterior, has occurred in the Middle Glacial sand of Hopton, and a similar fragment in 
the Fluvio-marine Crag of Bramerton. 
Lepa myauis? Couthouy. Supplement, Tab. IX, fig. 2a, 6. 
Nucuna myauts, Couth. Bost. Journ. Nat. Hist., vol. ii, p. 61, pl. 3, fig. 7, 1838. 
Locality. Fluvio-marine Crag, Postwick. Lower Glacial, Runton. 
The specimen figured is one in the British Museum, and agrees with the recent 
myalis of Couthouy in all respects, but I question whether after all it is anything more 
than an extreme form of the preceding species odlongoides. The specimen figured is, with 
another valve in the British Museum, marked “ Postwick,” and a third there is marked 
“Runton ” which can only be from the Lower Glacial sands, which are fossilliferous at 
that place. 
Fig. 13 a, 6, of ‘Crag Moll.,? Tab. X, may retain the name of Z. caudata, Donovan, 
and fig. 12a, 6, of the same plate I will refer to mnuta, Mont. This latter is from the 
Red Crag, and the caudata is the Bridlington form. 
1 It is the shell referred to under the name Uimatula in the list in ‘ Quart. Journ. Geol. Soc.,’ vol. xxvi, 
p. 94. 
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