LAMELLIBRANCHIATA. 357 



Mr. Humphreys, &c. A small specimen pi'ocured at Portmarnock by 

 Dr. Lloyd of Malahide. 



Genus Saxicava. 

 S. ritgosa, 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 Baktni or other excrescences on oysters, clams [Pecten max- 

 imtis), and in the roots of the tangle {Laminaria 'digituta). 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 riigosa. — I find specimens sheltering among broken 

 Balani and in the interstices of CcJh'pora cervicornis, both attached to a 

 stone brought up from 40 fathoms ofl' 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 TuBICOL.li. 



Genus Gastp.och.t:na. 

 G. liholadia, 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. Hvmiphreys. 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. 2Mi)yracea, 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 diff'erent." 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 coimtry (red marl). Dr. Farran discovered it hi a position and 

 formation greatly at variance with its Engliish habitat, having found it in com- 

 pany with three other Plioladce, in a submerged bog, directly under his house 

 at Clonell, near Dungarvan. Both these specimens were submitted to tlie ex- 

 amination of Prof. Edw. Forbes, during his recent geological visit to Waterford, 

 and elicited from that learned gentleman tlio remark that the fish was excellent, 

 but that the Pholas was a noble and unsurpassed specimen. The discovery of 



