58 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
* Trochus millegranus, Philippi. 
Trochus Clelandi, Wm. Wood ; Trochus Martini, Jas. Smith ; 
Trochus elegans, Jeffreys. 
Habitat——On hard ground in 8 to 30 fathoms, but young 
specimens occasionally occur in shallower water. It is 
rather a common species, and is found throughout the whole 
district on suitable ground. Exceedingly fine specimens 
were obtained on Bogany Point, Bute ; and off Silvercraigs, 
Loch Fyne, where it is plentiful. It is also more or less 
common on the Ascog and Craigmore shore, in Bute; and in 
Cumbrae, off Shellbole Bay. 
British distribution.—Abundant on the western coast of 
Scotland, and more or less common on all our western shores, 
extending as far south as the Channel Islands, becoming 
scarcer and smaller in the more southern localities. On the 
east coast the only locality I have noted is the Northum- 
berland coast, whence two or three specimens are reported 
by Mr. Alder, and where Messrs. Brady and Robertson 
report it as common. It occurs throughout the whole of 
Treland. 
Foreign localities —From Norway and Sweden (Lovén, 
and others) to Spain and Portugal (‘Andrew), the Medi- 
terranean (Naves, and others), Augean and Sea of Marmora 
(Forbes and Spratt). 
* Trochus zizyphinus, Linné. 
V) 
Trochus conuloides, Lamarck ; Trochus Cranchianus, Leach. 
Habitat—F rom low water on stony beaches and rocky 
ledges down to 10 fathoms, not an uncommon species in this 
district. Between tide marks I have taken it on west side 
of Battery Pomt, Cumbrae, and with the dredge off Shellbole 
Bay; also at Bogany and Craigmore, Bute ; and off Moll Dhu, 
Loch Fyne. Except var. hwmilior, I have not noticed any 
of the varieties. 
British distribution —Everywhere and generally common. 
It occurs in all the lists I have examined. 
Foreign localities—Everywhere from upper Norway 
throughout western Europe to Mogador, - Madeira, and 
eau ee as well as in the Mediterranean and Algean 
peas, 
