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MOLLUSCA. 
Genus Lottia. 
L. virginea, Muller. 
In Mr. Hyndman’s collection (Belfast) are a few specimens of this shell 
— the first obtained on the shore of Belfast Bay by Mrs. M‘Gee, the 
others found by Mr. H. adhering to oysters in Belfast market in 1831. 
L. testudinulis, Muller. 
Northern and eastern coasts. 
Newcastle, Down, Sep. 1 , 1836. Looked particularly for this shell on 
stones opposite the village, at low-water, and found only two or three 
dead ones. 
Bloody Bridge, Oct. 22, 1851. I found two very fine living specimens 
here at extreme low-water. I presume there are plenty, but I had a very 
short time to look for them. 
At Glassdrummond, two miles southward of the Bloody Bridge, Patrick 
Doran tells me it is common at low-water mark, and very fine. 
L . fulva, Muller. 
One of this species was found by Miss M. Ball several years ago in 
company with Crania personata, Lam., on a stone dredged in very deep 
water at Youghal. 
ORDER GIRRHO BR AN CHI AT A. 
Genus Dentalium. 
D. dentalis, Turt. 
Eastern and western shores of Ireland. 
D. entalis, Linn. 
On most parts of the Irish coast. 
ORDER CYCLOBRANCHIATA. 
Genus Patella. 
P. vulgata, Linn. 
Common everywhere. 
P. pellucida, Linn. 
Of general occurrence. 
P. ancyloides, Forbes. 
Obtained by Mr. Hyndman many years ago on oysters from Strangford 
Lough. Length 3 lines, breadth 2f, height If. The great resemblance 
this shell bears to the Ancylus Jluviatilis is not confined to external ap- 
pearance, but internally it exhibits the same bluish cast. 
Genus Chiton. 
C. fascicularis, Linn. 
Generally distributed. 
