ISOCARDIA, CYPRINA. PR: 
FAMILY CYPRINIDEH, Geinitz. 
Isocarp1A, Lamarck. 
Isocardia cor, Linné. 
Chama cor, Linné; Cardium humanum, Linné. 
Habitat—I have never found even a fragment of this 
shell; but Mr. Norman states that he took two or three 
single valves in deep water between the Cumbraes. Living, 
as it does, in considerable abundance in the Irish Sea, and 
being occasionally found at Oban and Iona, as well as on the 
Galloway coast, there is nothing to prevent this species 
finding a home in our firth. The occurrence of two or 
three single valves can scarcely be accounted for in the same 
way as we account for a like occurrence of Pecten Islandicus, 
&e., as I believe Isocardia has not been met with in any of 
our post-tertiary deposits. It is not named in the recently 
published “Catalogue of the Western Scottish Fossils,” a 
list, the thoroughness of which is guaranteed by the names 
on the title page. These valves found by Mr. Norman may 
have been thrown overboard from some fishing boat return- 
ing from the herring fishery on the Irish coast. 
British distribution—Cornish coast; south and east of 
Treland, being chiefly at home on the Dublin coast; Mull of 
Galloway; Iona, and other localities on west and north-west 
of Scotland; also found by Dr. M‘Intosh at St. Andrews. 
Foreign localities —From Norway (Jeffreys), throughout 
western Europe to the Mediterranean and Aigean (Vares, 
and others). 
Cyprina, Lamarck. 
* Cyprina Islandica, Linné. 
Venus Islandica, Linné; Pectunculus crassus, Da Costa ; 
Cyprina vulgaris, Brown. 
Habitat—In muddy sand; nearly everywhere. I have 
taken it on all sides of Rothesay Bay; east and south sides 
of Bute; west side of Cumbrae, and onthe Tan Spit. Young 
shells are very common, but living adult specimens are (in 
my experience) seldom taken by the dredge; large and fine 
dead individuals are, however, often obtained. My largest 
specimen is from Kilbrennan Sound, and measures 43 x 44 
inches. It was taken by the long line fishermen ; and I owe 
it to the kindness of Captain Kerr of Campbeltown. 
British distribution.—Everywhere throughout our seas ; 
very common. Lister, who gives a good figure of this species 
