6-l< REPORT 1875. 



On the further Exten&wn of the lihcetic or Penarth Beds in WanvicJcsliire, 

 Leicestershire, Nottinghamshire, Yorlshire, and Cumberland ; and on the 

 Occurrence of some supposed Remains of a new Lcd>yrinthodon and a new 

 Radiate therein. By the Rev. P. B. Beodie, F.G.8. 



The author points out a considerable extension of the Rhsetics in Warwickshire, 

 Leicestershire, Nottinp-hamshire, Lincolnshire, and Yorkshire, and traces of them in 

 Cumberland and Staffordshire. Many sections are described and characteristic 

 fossils given, thus showing that though they appear to thin out north and north- 

 eastwards, yet in aU probability they will be detected beneath the Lias in its range 

 from S.W. to N.E. The line typical sections of Aust, Watchet, Penarth, AVest- 

 bm-y, and Wainlode cliffs are alluded to. In this formation near Leicester probable 

 remains of the Lab^Tinthodon and a new Radiate are for the first time recorded. 

 Thus the British Rhffitic series, though greatly inferior both in thickness and 

 abundance and variety of fossils to the much more largely developed rocks of this 

 age in the Austrian Alps, is still a well-defined and highly fossiliferous formation 

 occupying a considerable area and holding an important and independent position ; 

 and future researches will no doubt greatly increase our knowledge both of its 

 extent and fossils. 



On the Origin of the Red Clay found by the ' Chcdlenger' at great Depths in 

 the Ocean, By Dr. W. B. Caepentee, F.R.S. 



On the Condition of the Sea-bottom of the North Facijic, as sJiotvn by the 

 Soundings recently taken by the U.S. Steamship ' Tuscarora.' By Dr. W. 

 B. Cabpenter, F.R.S. 



On the Northern End of the Bristol Cocdfield. By Handel Cossham, F.O.S., 

 Ebwakd Wetheeed, F.G.S., and Walter Saise, F.G.S. 



Note on the Deposit of Tin-ore at ParJc of Mines, St. Columb, Cornwall. 

 By Clement Le Neve Foster, B.A., D.Sc, F.G.S. 



The tin-ore occurs in thin layers, generally 1 or 2 inches thick, interposed be- 

 tween the planes of bedding of the clay-slate, or Jiillas, a hardened jointy shale. 

 These layers strike E. & W., and dip north, at an angle of 60° or 70° with the 

 killas. They appear to be lateral offshoots of small north and south veins, and they 

 rarely extend more than a few feet to the E. and W. of tliem. Sometimes the 

 killas is full of little layers of tinstone for a distance of 100 fathoms from N. to S., 

 40 fathoms along the dip, and 6 to 10 feet along the strike. 



On Moraines as the retaining Walls of Lalces. By Ebwaed Fet, Q.C. 



The object of this paper is to ask a question. 



The origin of many lakes is attributed to terminal moraines of extinct glaciers, 

 which are supposed to act as the retaining walls by which the water is held back to 

 form a lake. Llyn Idwj'l is referred to as an illustration of this theory. But all 

 terminal moraines of existing glaciers are cut through to the level of the ground 

 by the streams from the glaciers. The numerous terminal moraines of the Rhone 

 glacier, each cut through by the infant Rhone, were referred to as an illustration of 

 this familiar fact. 



For a moraine to act as a retaining wall for water, the breach must be wholly or 

 partially filled up. How has this been done ? 



