joints of the pentacrinus; this formation may be studied most advantageously along the line of coast between Gerron point and Lough Larne, on the east side of Antrim, where several sections of it are exhibited. On the south of Gerron point the extensive bay of Glenarm opens; the village of Glenarm itself is situated near the south cape of the bay, between two lofty hills of chalk covered with basalt; the range with which these are connected sweeps in a bold semicircle round the bay, receding considerably from the line of coast which generally presents only a flat beach; towards the centre of the bay, however, a low crag of red sandstone occurs, distinguished by the name of the red braes of Carnallock; half way between these and Glenarm, the clay of the lias formation may be traced, interposed between the red sand and the green sand which underlies the chalk.
But this formation is far better displayed after doubling the Cape of Glenarm in the cliffs beneath the deer park, about two miles south-east from that village; here it emerges from under the chalk and green sand, and exhibits a thickness exceeding 100 feet. Near the outlet of Lough Larne lias has been traced in Port Muck, at the north-east extremity of the island of Magee, and borings, engaged in from the hopeless speculation of discovering coal, have proved its existence among the substrata in other parts of that island, where it rests on red marle containing gypsum. On the western shore of Lough Larne, lias occurs about one mile south from the town whence the lough derives its name; it skirts the margin of the lough for some distance towards the south, but does not appear to rise many feet above high water mark. Only one thin stratum of the limestone is here visible; this contains gryphites and pentacrinites.
We understood that lias had been traced in several places between Larne and Belfast. In Colin Glen, about four miles south-south-west
