724 BEPORT — 1802. 



been found. Two or tLree show the position of the vertebral column and rib«, but 

 up to the present no definite centra have been traced ; besides this there is evidence 

 of scapula, clavicle, humerus, radius, and ulna, the humerus having the charac- 

 teristic anomodont expansion of the two extremities. In two specimens the ilia 

 are preserved. These forms appear to be distinct from Dicynodon, and probably 

 represent at least two or three species. 



Another skull presents most of the characters of Ttycliorjnathus, but has a short 

 muzzle and no teeth. The last and by far the most remarkable skull of this 

 series is about six inches in length, and has the outer surface completely covered 

 in by bony plates, the nostrils, orbits, and pineal fossa being the only apertures. The 

 chief feature of this skull is the extreme development of horns upon the face and 

 cheeks, there being about thirty of these formidable defences, varying from a fourth 

 of an inch to nearly three inches in length, besides some smaller bosses. The 

 dentition is pleurodont, and resembles very closely that of the living Iguana ; the 

 palate is lacertilian, but with the pterygoids united iu front of the pterygoid 

 vacuity. This skull reminds one very strongly of the living Moloch and Phrynosoma, 

 but it probably finds its nearest ally in the Pareiasaurus from the South African 

 Karoo Bed. The detailed description of these specimens is nearly completed, and 

 will, it is hoped, be shortly published. 



8. Report of the Committee on the Registration of Tij^e Specimens. 

 See Reports, p. 289. 



9. Report of the Committee on the Cretaceous Pohjzoa. 

 See Reports, p. 301. 



10. Report of the Committee on Earth-tremors.- -See Reports, p. 343. 



W£DXUSDAr, AUGUST 10. 



The following Papers and Reports were read : — 



1. Additions to the Eurypterid Fauna of the Upper Silurian, 

 By Malcolm Laurie, B.A., B.Sc, F.L.S.^ 



The uppermost Silurian rocks are almost universally characterised by a well- 

 developed Eurypterid fauna. It has been described iu Eussia, Bohemia, and 

 America, as well as in two or three places in Great Britain. The range of the 

 species, however, is, as a rule, very limited, almost every new locality yielding 

 new forms. 



The Silurian rocks of the Pentland Hills, passing as they do conformably into 

 the Lovrer Old Ked saiidstone, might be expected to yield some trace of this fauna, 

 and a small bed containing somewhat abundant I'emains was described by Mr. 

 Henderson iu the 'Transactions of the Edinbuigh Geological Society,' vol. iii. 

 The collection which he made is now in the Museum of Science and Art, where 

 I had an opportunity of examining it last year. 



The specimens belong to three genera, one of which is new. Eurypterus is 

 represented by three species, one of which— represented only by fragments — may 

 be identical with U. scorpioides of Woodward ; the other two appear to be new. 



' A detailed account of these forms is in course of publication in the Transactions 

 of the Royal Society of A'ditibtiryJi. 



