6 4 
Praeger — The Marine Shells 
size, and all P. ingens or P. fragilis (Turt. Brit. Biv.),” and he gives Port- 
rush, Belfast Bay, and 50 fathoms off Island Magee, as localities where 
examples have been procured. It has been found at the first -mentioned 
station by Miss Richardson also. Probably the earliest record of this shell 
in our district is that in a letter from the Rev. Robert Innes, Rector of Magil- 
ligan, to Dr. Nicholson, Bishop of Derry, dated June 2nd, 1725, in which he 
describes a large example found in that neighbourhood. General Portlock, of 
the Geological Survey, writing in 1843*, and commenting on the above, says 
“ this coast continues a good locality for Pinna fragilis ; to obtain the fish in 
the valves they must be dredged up from deep water.” 
Mytiltas edulis, linne. 
Common on all our shores. Thompson gives some interesting notes as to 
the rapid growth and increase of this prolific species ; for instance, that on a 
buoy in Belfast Lougb, cleaned after being 5 years down, “the entire cir- 
cumference of the base, for a foot of space always under water, was covered 
a foot thick with full-grown mussels ” ; and that the bottom of the pilot- oa 
after its being 9 months afloat, yielded quantities of mussels 1^ inches ong. 
Mr. Incurvata. “ The only bivalve seen on Tory Island, where it is abun- 
dant, covering the rocks” — Thompson. 
pellucida. « Common in some parts of Belfast Bay ’’-Thompson (™» 
M. pellucid**). Cultra, S. A. Stewart-Belf. Mus. CoU. 
TVIvtilus modiolus, Linne. 
The “horse-mussel” is common, living in gravelly and muddy localities m 
6-90 fathoms. Dickie found it very abundant in Strangford Lough (4-2» 
fathoms), coming up in quantity in almost every haul of. the dredge (sub 
Modiola modiolus). 
var. ovata. “ County Antrim (J .G. J .)”— Jeffreys. 
Tompson mentions it («» ** 
Belfast Lough -and Hyndman, under the same name, as living sparingly in 
“ 2 0fathol, while, he obtained dead valvesm i the Turbot^ Banked 
in 75 fathoms near the Maidens. Strangford Loug e ' . „ „ t d c r . 
found complete and fresh-looking specimens on the shores of Belfast and La. 
lingford Loughs. 
My L^gTSa^off BeMast Lough, and in 70-90 fathoms off Lame 
-Hyntoan (sub Modiola phamlim); and in 4-20 fathoms in Strangford 
Lough — Dickie. 
Tunicata, all round the coast, in depths up to 90 fathoms. Hyndman places 
it under genus Cremlla, and Thompson and Dickie under MMa. 
* Be port on the Geology of the County of Londonderry &c., p. 23. 
