88 Praeger — The Marine Shells 



eludes in the British catalogue, 20 are recorded as occurring in our province. 

 The Rissoa, and that other large genus of small univalves, the Odostomice, will 

 serve as good examples of the richness in the smaller univalves of that inte- 

 resting area of sand and gravel which is known as the Turbot Bank. Thus, 

 of the 20 species of Rissoa found in the district, 18, or all but 2, occur in the 

 shell-sand from this vicinity, about half of these being inhabitants of the 

 littoral and laminarian regions, while the other half frequent the coralline and 

 deep-sea zones. As regards Odostomia, to be mentioned presently, we bave 

 24 species, out of 34 British, of which no less than 21 occur in the Turbot 

 Bank sand, and 1 of these have not been obtained elsewhere in our waters. 

 As suggested by Mr. Hyndman, the home of the majority of this large num- 

 ber of species, whose deserted habitations bestrew the Turbot Bank, is pro- 

 bably the profound rocky depths near the Maidens, where they may live, out 

 of reach of the trawl and dredge. 



Note. — Except where otherwise stated, the shells referred to in the notes 

 on species of Hissoa, were dead. 

 Rissoa striatula, Montagu. 



Bundoran — Thompson. Frequent on the Turbot Bank — Hyndman. 

 Rissoa cancellata, Da Costa. 



Of frequent occurrence on the Turbot Bank— Hyndman. Dredged in 

 Strangford Lough, and the open channel adjoining — Dickie. (Both sub R. 

 crenulata). 

 Rissoa calatnrus, Forbes # Hanley. 



Turbot Bank, rare— Hyndman. 

 Rissoa reticulata, Montagu. 



Common on the Turbot Bank — Thompson, and Hyndman. Common, 7-20 

 fathoms, Castle Ward Bay, Strangford Lough — Dickie. (All sub R. Beanii). 

 In shell-sand dredged near Ardmillan in the latter lough— R.L1.P. 

 Rissoa clmicoides, Forbes. 



" Larne, Co. Antrim (J.G.J.) "—Jeffreys. The Turbot Bank is probably 

 the locality intended. Specimens in the Belfast Museum Collection are 

 labelled as from Larne. 

 Rissoa punctura, Montagu. 



Bundoran — Thompson. Common on the Turbot Bank — Hyndman. 

 Rissoa Zetlandica, Montagu. 



On the Turbot Bank— Hyndman. Specimens from thence are in the 

 Belfast Museum Collection. 

 Rissoa costata, Adams. 



Bundoran— Thompson. On the Turbot Bank, and in about 20 fathoms off 

 Ballygalley Head — Hyndman. Strangford Lough— Dickie, and R.L1.P. 

 Rissoa parva, I>a Costa. 



"A very common species around the coast" — Thompson. It lives in 



