Praeger — Fossils at Alexandra Dock, Belfast. 43 



* Tapes virgineus, linn. 



Very rare. I found two worn valve3 in the yellow sand. 



Xiucinopsis undata, Penn. 



In great abundance, and very large, in the upper clay, of which it is one of 

 the most chai-acteristic 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. 



Telllna 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, JDa Costa. 



Very rare. A few specimens in the newest deposit. 



Psammobia Ferroensis, Chemn. 

 Single valves occasionally observed. 



* WCactra solida, var. elliptica, Brown. 



One valve in the lower clay. 



Mactra subtruncata, Da Costa. 



Very frequent, but small and of variable form, in the deposits. 



Imtraria elliptica, Lamh. 



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. 



Scrobicularla alba, Wood. 



In extraordinary profusion in the upper clay. Much rarer in both the 



underlying clay and the yellow sand. 

 Scrobicularla piperata, Bellonius. 



Ln 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, Poh. 



Upper clay only, not rare. 



