30 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
Lucinopsis, Forbes and Hanley. 
* Lucinopsis undata, Pennant. 
Venus undata, Pennant ; Venus inquinata, Lamarck ; Lucina 
undata, Brown; Artemis undata, Alder. 
Habitat—In muddy sand and gravel, in Kames Bay and 
on the Tan Spit, Cumbrae; in Rothesay Bay, Bute ; and off 
Otter Spit, Loch Fyne; generally in about 8 to 12 fathoms, 
but scarce and seldom good. 
British distribution—Every where in sandy bays through- 
out our isles, but not generally common; Dr. M‘Intosh, how- 
ever, says that it is thrown on the beach at St. Andrews, 
after storms, in vast numbers. 
Foreign localities—Norway (Lovén and Savs), Spain and 
Portugal (Andrew), Mediterranean and Algean Seas 
(Forbes, and others). 
Famity TeELLINIDA, Latreille. 
TELLINA, Linné. 
Tellina crassa, Pennant. 
Venus crassa, Gmelin ; Pectunculus depressior, Da Costa ; 
Tellina rigida, Pulteney ; Arcopagia crassa and A. ovata, 
Brown. 
Habitat—Scarce in sand and nullipore, in about 6 to 8 
fathoms. I have taken one specimen on the Tan Spit, 
Cumbrae, and one off Silvercraigs, Loch Fyne. Single valves 
occur pretty frequently. 
British distribution.—On sandy ground throughout our 
seas. Scarce in western and northern waters, but common 
in the south-west of England and Iveland. It occurs on the 
Northumberland coast plentifully, as well as at St. Andrews 
and other east coast localities. 
Foreign localities—Norway (Sars, and others), Spain and 
Portugal (M‘Andrew), Mediterranean (Deshayes, and others). 
* Tellina Balthica, Linné. 
Tellina solidula, Pulteney; Tellina parva, Lister; Tellina 
earnaria, Pennant ; Tellina rubra, Da Costa. 
Habitat.—Not uncommon but somewhat local, on muddy 
eravel and sand, between tide marks at Rothesay Bay and 
Kamesburgh Bay in Bute; Fintry Bay, Cumbrae; and at 
Lochgilphead ; being plentiful and fine in the last-named 
