Notices of Memoirs — Prof. S. G. Seeley — On Iguanodon. 561 



and rests upon Lower Silurian slate. Its dimensions are nearly 

 as follows: — length, 14 feet; height, 9 feet; breadth, 9 feet. 

 It contains about 35 cubic yards of matter, and its weight would 

 be about 70 tons. From the site of the Mottha Stone, at a level 

 of 810 feet above the sea, the eye ranges westward along the 

 magnificent valley of Glenmalui-e, to the flanks of Lugnaquilla, 

 at a distance of about ten or twelve miles, whence, as we may 

 suppose, the granite block started on its journey. In its course 

 it must have crossed the deep hollow of the Avonmore valley, 

 which extends just below the feet of the observer transversely 

 to the path of this remarkable erratic block. 



2. Castle Kevin. — In the valley between Castle Kevin and 

 Moneystown, where large boulders are numerous, there lies a block 

 of granite, partially imbedded, of which the dimensions are : — 

 length, 15 feet ; breadth, 10 feet ; height, 9 feet (imbedded portion 

 — probably o feet — is not included in above). This block contains 

 about 50 cubic j'^ards of matter, and is about 100 tons in weight. 

 The birthplace of this boulder was pi'obably the mountainous tract 

 about Mullaghcleevann, 2783 feet in height, lying at the head 

 of the valley in which is situated the deep waters of Lough Dan. 

 and it probably travelled a distance of eight or nine miles in an 

 E.S.E. direction. 



3. The last boulder-stone that I shall mention is the largest 

 I have met with in co. Wicklow — perhaps in the British Islands. 

 It stands behind a cottage by the roadside, near Eoundwood Church, 

 and is quite as large as the cottage itself, to which it forms a good 

 pi'otection from the storms descending from the mountains behind. 

 This boulder consists of granitoid gneiss, resting on Lower Silurian 

 slate and grit. Its dimensions are (q. p.) : — length, 21 feet ; breadth, 

 14 feet ; height, 12 feet. Its form is somewhat oval, and it contains 

 about 120 cubic yards of matter, and is about 240 tons in weight. 

 The source of this block, which lies at an elevation of about 800 feet 

 above the sea, was probably in the same locality with that of the 

 Castle Kevin boulder, and the distance travelled was about six or 

 seven miles. 



The blocks above noticed, with many others of sinaller size, 

 do not belong to any of the local glaciers which once filled the 

 valleys towards the close of the glacial epoch, and which have left 

 numerous well-formed moraines in nearly all the principal valleys 

 descending from the Wicklow range. They are to be referred, 

 in all probability, to the eai'lier stage of intense glaciation, in which 

 the whole district was covered with perennial snows and ice, moving 

 eastward into the hollow now occupied by the waters of the Irish Sea. 



II. — On the Eeputed Clavicles and Interclavicles of louAxoDoy. 

 By Professor H. G. Seelet, F.R.S.^ 



THE author showed, by superimposing a figure of the reputed 

 clavicle upon the bone figured by Mr. Hulke as clavicle and 

 interclavicle of Iguanodon (Quart. Journ. Geol. Soc. vol. xli. pi. xiv.), 

 ^ Abstract of a paper read before tbe Britisb Association, Manchester, Sept. 1887. 



DECADE III. — VOL. IV. NO. XII. 36 



