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 Turhot Bank. Thus, 
of the 20 species of Rissoa found in the district, 18, or all but 2, occur m t e 
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 he mentioned presently, we have 
24 species, out of 34 British, of which no less than 21 occur in the Turbot 
Bank sand, and 10 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 m the notes 
on species of Rissoa, were dead. 
Rissoa striatula, Montagu. 
Bundoran— Thompson. Frequent on the Turhot Bank— Hyndman. 
Rissoa cancellata, Fa Costa. . 
Of frequent occurrence on the Turbot Bauk-Hyndman. Dredged m 
Strangford Lough, and the open channel adjoining-Diekie. (Both sub It. 
crenulata). 
Rissoa calathrus, Forbes $ Manley. 
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. Beanu). 
In shell-sand dredged near Ardmillan in the latter lough— R.L1.P. 
Rissoa cimieoides, Forbes. 
« Lame, Co. Antrim (J.G.J.) ’’-Jeffreys. The Turbot Bank is probably 
the locality intended. Specimens in the Belfast Museum Collection are 
labelled as from Lame. 
Rissoa punetura, Montagu. 
Bundoran— Thompson. Common on the Turbot Bank— Hyndman. 
Rissoa Zetlandiea, Montagu. 
On the Turbot Bank-Hyndman. Specimens from thence are m the 
Belfast Museum Collection. 
Rissoa costata, Adams. ^ a 
Bundoran— Thompson. On the Turbot Bank, and in about 20 fathoms off 
Ballygalley Head— Hyndman. Strangford Lough— Dickie, and R.L1.P. 
Rissoa parva, Fa Costa. 
“A very common species around the coast” Thompson. It lives in 
