Praeger — Fossils at Alexandra Dock ) Belfast. 
43 
* Tapes virgineus, Linn. 
Yery rare. I found two worn valves in the yellow sand. 
Iiucinopsis undata, Penn. 
In great abundance, and very large, in the upper clay, of which it is one of 
the most characteristic fossils. Large single valves occur in numbers in 
the shelly layer at the base of the yellow sand, lying on the upper surface 
of the clay. 
Tellina Balthica, Linn. 
In profusion, but of small size, in the top clays. Abundant and large in 
the lower clay, particularly in the basal portion. 
Tellina tenuis, La Costa. 
Very rare. A few specimens in the newest deposit. 
Psammobia Ferroensis, Chemn. 
Single valves occasionally observed. 
* IVtactrasolida, var. elliptica, Brown. 
One valve in the lower clay. 
Mactra subtruncata, La Costa. 
Yery frequent, but small and of variable form, in the deposits. 
XiUtraria elliptica, Lamk . 
Over the greater portion of the excavations young specimens only occurred, 
but, as previously mentioned, near the outer entrance, where the clay 
thinned out to a depth of only a couple of feet, full-grown specimens were 
abundant, covered with a rich golden-brown epidermis, and measuring up 
to six inches in breadth. 
Scrobicularia alba, Wood. 
In extraordinary profusion in the upper clay. Much rarer in both the 
underlying clay and the yellow sand. 
Scrobicularia piperata, Bellonius. 
In countless thousands in the lower clay. Almost entirely absent from the 
other beds. 
Solen pellucidus, Penn. 
Frequent in the deep-water deposit. 
Solen vagina, Linn. 
In the upper clay and yellow sand, not uncommon. It is very strange how 
this species has disappeared from our bay, and how S. siliqua , which is 
unknown in the Estuarine Clays, has taken its place. 
Solen ensis, Linn. 
With the last, but rarer. 
Thracia papyracea, Poli. 
Upper clay only, not rare. 
