1901.] Olf EXTINCT SEiPTILES FROM PATAGOTflA. 169 



specimen of one of the large Bird-catching Spiders (Avicularia). 

 This Spider did well up to the end of August last, when it died 

 soon after casting its " skin." This skin, which is perfect, I 

 exhibit. The Spider itself was so soft when it died that I could 

 not set it. 



The process of casting the " skin " amongst the large Spiders is 

 a very trying one, and most of the specimens we have had have 

 died during the process or soon after. 



On behalf of Captain Stanley Flower, F.Z.S., Mr. Sclater ex- 

 hibited photographs of three fine animals living in the Zoological 

 Garden at Grhizeh, taken by Captain T. H. Mackenzie, of the 

 Army Pay Department. Mr. Sclater remarked that the photo of 

 the young female Griraffe {Giraffa camelopardalis iypica) and that 

 of the young male White Oryx {Oryx leucoryx) represented the 

 specimens brought by Captain Mower from the Soudan last year ; 

 the photo of the fine adult male Ostrich was of special interest 

 as showing the vocal sac (text-fig. 48, p. 168) as extended in the 

 breeding-season. 



On behalf of Dr Einar Lcinnberg, two photographs of the largest 

 skull of the East Greenland Musk-ox obtained during Mr, G. 

 Kolthoff's expedition were exhibited. The dioiensions of the 

 specimen were : — 



Basal length 460 millim. 



Greatest orbital length 280 „ 



Greatest occipital width 187 ,, 



Length of boss of each horn 205 „ 



The following papers were read : — 



1. On some Extinct Reptiles from Patagonia^ of the Genera 

 Miolania, Dinilysia, and Genyoclectes. By A. Smith 

 Woodward, LL.D., F.R.S., F.Z.S. 



[Received March 1, 1901.] 



(Plates XV.-XX.i) 



To the north of Patagonia there is a widely distributed forma- 

 tion of red sandstone, supposed to be of Cretaceous age, con- 

 taining important remains of extinct Eeptiles in association with 

 equally remarkable fragments of extinct Mammals. Many of 

 these fossils haA^e been skilfully collected by Mr. Santiago lioth 

 for the La Plata Museum ; while some of them, belonging to 

 gigantic Dinosaurs and small Mesosuchian Crocodiles, have already 

 been the subject of illustrated monographs '. A few of the most 



^ For an explanation of the Plates, see p. 183. 



- E,. Lydekker, "The Dinosaurs of Patagonia," Anales Mus. La Plata — 

 Paleont. Argentina, no. ii. (1893). A. Smith Woodward, " On two Mesozoic 

 Crocodilians, Notosiwhus (genus novum) and Cynodontosuchus (genus novum), 

 from the Red Sandstones of the Territory of Neuquen," Unci. no. iv. (1896). 



