LAMELLIBRANCHIATA. 357 
Mi*. Humphreys, &c. A small specimen procured at Portmarnock by 
Dr. Lloyd of Malahide. 
Genus Saxicava. 
S. rugosa , Linn. 
Common around the coast on the North and East ; found from between 
tide-marks to 20 fathoms, and either burrowing or free. Found shelter- 
tering among Balani or other excrescences on oysters, clams {Pecten max- 
imus ), and in the roots of the tangle {Laminaria ’digitata). I have seen 
large blocks of limestone brought up from some depth in Dublin Bay 
completely honeycombed externally, apparently by this species, as its shells 
only were in the apertures. 
Jan. 1848. Saxicava rugosa. — I find specimens sheltering among broken 
Balani and in the interstices of Cellepora cervicornis, both attached to a 
stone brought up from 40 fathoms off the Gobbins, Co. Antrim. 
I find it in the vacant space between the upper portion of Anomia, and 
the oysters to which they are attached. 
Family TuBlGOLiE. 
Genus Gasteoch^ena. 
G. pholadia, Mont. 
South Islands of Arran, off Galway Bay, and Youghal, County Cork, 
Dr. Ball. Burrowed into limestone in latter locality. Spike Island, Cork 
Harbour, Mr. Humphreys. Dr. Farran obtained it at Birterbuy Bay, as 
Sowerby figures it from the Mediterranean, within a caddis-like case, 
formed by itself of agglutinated sand and shells. 
Genus Pholas. 
P. crispata, Linn. 
Portmarnock, Belfast Lough, Brown. Inhabiting indurated clay 
(“ variegated marl”), about low- water mark, Belfast Bay. Youghal, Dr. 
Ball. Ballycotten, Co. Cork, Miss Ball. 
P. papyracea, Turt. 
. Two specimens of this shell in the Ordnance Museum are labelled 
Portrush,” North of Ireland. In the fifth volume of the Annals, p. 
14, this species was noticed as Irish, with some doubt. Prof. Harvey now 
writes to me, that “ the specimen there alluded to as found in a fishing- 
boat at Dublin, was procured by Mr. Wm. Todhunter, who believes it to 
have been dredged on a shelly bank between Howth and Lambay. It cer- 
tainly was embedded in a sandy conglomerate of shells, &c., which is 
commonly dredged in this place ; the Torbay habitat, if I remember right, 
is hard red sandstone, and totally different.” It is remarked, in reference 
to the former note — “ All the boats of a certain class in this port (Dublin) 
are called ‘ Torbay ’ boats, as they originally came from that place.” 
“ This shell is tolerably abundant in Devonshire, and typifies a peculiar de- 
posit in that country (red marl). Dr. Farran discovered it in a position and 
formation greatly at variance with its English habitat, having found it in com- 
pany with three other Pholadce, in a submerged bog, directly under his house 
at Clonell, near Dungarvan. Both these specimens were submitted to the ex- 
amination of Prof. Edw. Forbes, during his recent geological visit to Waterford, 
and elicited from that learned gentleman the remark that the fish was excellent, 
but that the Pholas was a noble and unsurpassed specimen. The discovery of 
