320 
MOLLUSCA. 
T. cinerarius , Turt. 
Still more widely diffused, and in greater numbers than the last- 
Found at the depth of a few fathoms, as well as living between tide- 
marks. 
T. littoralis, Brown. 
Killough, County Down, and Clew Bay, County Mayo, are the localities 
in which this species is said to be found. 
T. tumidus, Turt. 
Dredged in very limited numbers from the deeper portions, 10 to 12 
fathoms, &c., in Belfast and Strangford Loughs, and at Donaghadee. Like 
most of our Mollusca, &c., it attains a much larger size on the Dublin 
coast than in the localities just named. In Clifden and Clew Bays, on 
the western coasts, it was dredged by our party in 1840. 
T. papillosus, Br. 
Dublin Bay ; Bray, County Wicklow. Single specimens of this fine 
species have been obtained on the South-West coast of Scotland, from 50 
fathoms off the Mull of Galloway (Capt. Beechy, B. N.), and from 40 off 
Sana Island (Mr. Hyndman). 
T. ziziphinus, Br. 
Of common occurrence, but not numerous, on our northern coast, from 
just below low-water mark to 12 fathoms, &c. ; inhabits chiefly the La- 
minarian region, and is found on the fronds of Laminaria. This Trochus 
is subject to considerable variety; the T. discrepans, Brown, Irish Tes- 
tacea, p. 519, pi. 24, f. 4, is noticed as such by Turton in his Conch. Diet., 
p. 189. A single specimen only is recorded to have been found at Holy- 
wood, Belfast Bay, by Miss Templeton. The pure white variety has been 
dredged of all sizes, but very sparingly, in this lough, by Mr. Hyndman 
and myself ; on one occasion we found numbers of this variety on the 
beach at Ardmillan, whence they were brought adherent to “ wrack ” 
(fuci) cut for manure about some of the islands. 
T. millegranus, Philippi. 
This species has been in my collection for some years from the north- 
ern and southern localities of Strangford Lough and Bantry Bay.- Prof. 
Forbes informs me that it is to this Trochus the name of T. Martini is 
applied in Mr. Smith’s paper, lately published in the Wernerian Memoirs 
(vol. viii. part 1). It is there stated that Mr. Alder found the species at 
Dublin, but I understand that the Irish specimens thus alluded to were 
not from that locality, but from the one first mentioned here. Mr. Hum- 
phreys of Cork, from whom I had the Bantry Bay specimen in 1835, 
stated that Dr. Turton had named it T. conuloides. T. Clelandi , 
Wood, Index, Test. Supp., f. 15, is considered another var. It was sent 
to the Author from Strangford Lough, by James Bose Clealand, Esq., 
Dalkey Sound, Dublin Bay, Dr. Ball ; Glandore, County Cork, Prof. All- 
man; and Killery Bay, County Mayo, and Galway, W. T. &c., maybe 
named as localities in which this Trochus has been dredged. In the last 
it was taken within 3 to 12 fathoms. It inhabits the deeper portions of 
Strangford and Belfast Loughs, chiefly from 10 to 23 fathoms, in sand 
ooze, &c. ; living specimens were dredged from 50 fathoms off the Mull of 
Galloway, see Ann. N. H. vol. x. 21. Bundoran, Mrs. Hancock. 
