74 Geological Society: — 



to the Anatidse, in the near allies of which, the Goosanders and Mer- 

 gansers, the beak is furnished with strong pointed denticulations. 

 In these, however, the tooth- like processes belong to the horny bill 

 only ; and the author stated that the production of the alveolar margin 

 into bony teeth is peculiar, so far as he knows, to Odontopteryx. 

 He concluded, from the consideration of all its characters, ' ; that 

 Odontopteryx was a warm-blooded, feathered biped, with wings ; 

 and further, that it was web-footed and a fish-eater, and that in the 

 catching of its slippery prey it was assisted by this pterosauroid 

 armature of its jaws.''' In conclusion, the author indicated the cha- 

 racters separating Odontopteryx from the Cretaceous fossil skull 

 lately described by Prof. 0. C. Marsh, and which he affirms to have 

 small, similar teeth implanted in distinct sockets. 



3. " Contribution to the Anatomy of Hypsilophodon Foxii, an 

 Account of some recentlv acquired Eemains of this Dinosaur." By 

 J. W. Hulke, Esq., E.RX E.G.S. 



After referring to Professors Owen and Huxley's descriptions of 

 the Mantell-Bowerbank skeleton in the British Museum, and to the 

 paper by the last-named gentleman on the skull of this Dinosaur 

 read at a meeting of this Society in ] 870, the author communicated 

 details of its dentition, the form of its mandible, and that of the 

 cones of the shoulder and fore limb, and of the haunch and hind 

 limb, hitherto imperfectly or quite unknown. The resemblance to 

 Iguanodon is greater than had been supposed ; but the generic di- 

 stinctness of Hypsilophodon holds good. 



4. " On the Glacial Phenomena of the ' Long Island,' or Outer He- 

 brides." By James Geikie, Esq., E.R.S.E., E.G.S., of H.M. Geolo- 

 gical Survey of Scotland. — First paper. 



The author commenced by describing the physical features of 

 Lewis, which he stated to be broken and mountainous in the south, 

 whilst the north might be described as a great peat moss rising 

 gradually to a height of about 400 feet, but with the rock breaking 

 through here and there, and sometimes reaching a higher elevation. 

 The north-east and north-west coasts are comparatively unbroken; 

 but south of Aird Laimisheadar in the west and Stornoway in the 

 east, many inlets run far into the country. The island contains a 

 great number of lakes of various sizes, which are most abundant in 

 the southern mountain tract and in the undulating ground at its 

 base. The greater part of Lewis consists of gneiss, the only other 

 rocks met with being granite and red sandstone, and conglomerate 

 of Cambrian age. The stratification of the gneissic rocks is generally 

 well-marked; the prevalent strike is X.E. and S.W., with S.E. dip, 

 generally at a high angle. The author described in considerable 

 detail the traces of glaciation observed in the lower northern part of 

 Lewis, and inferred from his observations that the ice passed from 

 sea to sea across the whole breadth of this district, and that it not 

 only did not come from the mountainous tract to the south, but must 

 have been of sufficient thickness to keep on its course towards the 

 north-west undisturbed by the pressure of the glacier masses which 

 must at the same time have filled the glens and valley? of that 



