334 
MOLLUSCA. 
sionally found adapted to the form of the shell to which it attaches itself. 
Belfast and Strangford Loughs, Mr. Hyndman ; Carlingford, W. T. 
P. glaber , Mont. 
Cork Harbour, rare, Mr. Humphreys ; Birterbuy Bay, Dr. Farran. 
I have not seen the specimens from either locality. 
P. Icevis, Penn. 
Noticed as from “ Dublin Bay, very rare,” in Turton’s Catalogue ; but 
in his Conch. Diet. (p. 131 and 133), and Brit. Bival. (p. 213, 214), he 
makes P. Icevis, Mont., the same as P. similis, Laskey. Mr. Barlee in- 
cludes P. Icevis in his Birterbuy Bay list. 
P. similis , Laskey. 
Numerous valves were dredged from 45 fathoms off Cape Clear by Mr. 
M ‘Andrew, who finds it “ an abundant deep-water species from Scilly to 
Zetland.” Entrance of Belfast Bay, 30 — 35 fathoms, Mr. Hyndman. This 
species was noted, at the suggestion of Professor Edward Forbes, as pro- 
bably synonymous with P. Icevis, in my Report on the Invertebrata of 
Ireland. 
P. obsoletus, Penn. 
Taken not uncommonly, but in limited numbers, in the deeper parts of 
Belfast and Strangford Loughs, on shelly and sandy ground. A specimen 
dredged at Roundstone by Mr. Jeffreys, given me byThat gentleman. 
Mr. Humphreys mentions P. Icevis, Penn. Mont., as often found in the 
intestines of haddock and gurnard taken in Cork Harbour ; he favoured 
me with one of these specimens, which I regard as a smooth variety of 
P. obsoletus. 
P. varius, Linn. 
Not very uncommonly found attached by a byssus to the shells of oysters, 
brought from the North and East coasts, &c., to Belfast market. Dredged 
in Killery, Clifden, and Clew Bays in July, 1840. Dr. Farran mentions his 
finding P. varius and P. maximus at 20 fathoms in Roundstone Bay, and 
in some situations with not more than a foot of water over them in Clif- 
den Bay, and in some instances the P. varius was altogether dry, 1844. 
Mr. Warren has a specimen 3i inches long and the same broad, found at 
Killibegs. 
P. striatus, Muller. 
A single specimen dredged in Strangford Lough in 1837 by Mr. Hynd- 
man and myself. 
Procured on rocky ground, East of Cape Clear (40 to 45 fathoms), by 
Mr. M‘ Andrew, who remarks that “ it is a common though rather deep- 
water species.” I have obtained it at Scilly, Isle of Man, Mull of Galloway, 
Glenluce Bay, Clyde, and Hebrides ; generally adheres to stones ; only at 
Oban have I found it attached to the Fucus. 
I have learned from Mr. Barlee that he obtained this species in Birter- 
buy Bay (County Galway), in the summer of 1845. 1847, I saw a spe- 
cimen which was dredged off the coast of Waterford, near the Nymph 
Bank, in Mr. Warren’s collection. Nov., 1849, I saw one in Mr. War- 
ren’s collection, which he found among a mass of Caryophyllia Smithii 
brought him from the Nymph Bank above four years ago. * 
* Pecten Danicus, Cham. 
Pecten nebulosus. Brown’s Illust. 
In Dr. Farran’s collection are specimens of this Pecten, purchased of a dealer 
