190 NATURAL HISTORY SOCIETY OF DUBLIN. 
should say their habitat extends about twenty miles along the coast, 
which lies between St. John’s Point and Carlingford Lough. The 
clay bottom in this district extends seawards to a depth of forty fathoms.” 
Mr. Good invariably finds the animal living on the peculiar blueish clay 
described, sunk about two-thirds of its lower valve in the mud, and 
wherever it abounds the Norway lobster also flourishes. JI am happy 
to submit Mr. Good’s interesting observations to the Society; they 
enable us to understand the distribution of the shell along our eastern 
coast, and, by connecting its discovery with a peculiar sea bottom 
of dense blueish clay, they throw much light on its habits. 
The meeting then adjourned to the first Thursday in June. 
THURSDAY, JUNE 4, 1868. 
Dr. W. Frazer, M.R.I.A., in the chair. 
The minutes of the preceding meeting were read and signed. 
The following paper was read :— 
ADDENDA TO BririsH AnD IrisH Musconoey. By Davip Moors, Pu. D., 
F.L.S., M.R.TA. 
Havine endeavoured during a number of years consecutively to 
record the several species added to our list of Irish Mosses and Hepatice, 
according as they from time to time became known to us, and also new 
habitats for the rarer kinds of those plants, I have again to offer a few 
notes on this subject to the Society. 
The first species I shall bring before your notice is a very interesting 
discovery to the British and Irish Flora—viz., Grimmia gigantea, 
Schimper (Barbula recurvifolia, Mitten.) I collected specimens of this 
moss in a barren state a good many years ago, somewhere in the west 
of Ireland, and sent them at the time both to Mr. Wilson and to Mr. | 
Mitten for their opinion relative to the plant. In reply, the former 
gentleman stated as follows:—‘‘ Probably a Grimmia nearly allied to 
Grimnmua gigantea.” The latter considered it to be Barbula recurvifolia. 
In this state of uncertainty the matter rested until lately, when the 
Irish plant has been found to be truly Schimper’s Grimmia gigantea. 
In the interval the remainder of the specimens, which were not dis- 
tributed at first, have been lost, and I cannot now state with certainty 
where they were collected. However, the contents of the letter which 
I shall now read to you testifies to the correctness of the statement I 
have made regarding this plant having been discovered by me in Ire- 
land :— 
‘“* Manchester, 1st August, 1867. 
‘(My pEAR Str—I am quite certain that you really have found 
Grimmia gigantea (Schr.) in Ireland! Wilson mentioned some time ago 
