1872.] WINTLE — LANDSLIP IN TASMANIA. 33 



posterior thoracic segments, and others may yet be discovered with 

 even a larger number. 



In development, such organs must necessarily be removed ; not 

 one fossil-cleaner in a hundred would again put upon a trilobite 

 eleven spines which he had removed ; and in many instances such 

 appendages may have been overlooked. 



Tbe occurrence of this truly remarkable specimen may cause fresh 

 interest to be awakened among the numerous collectors of these 

 attractive fossils, and so lead to an increase of knowledge concerning 

 the group. 



Dimensions of Encrinurus crista- g alii: total length (including head) 

 3^ inches ; breadth of thorax 1| inches. 



EXPLANATION OF PLATE II. figs. 6 & 7. 

 Encrinurus crista-galli, H. Woodw. 



Fig. 6. Dorsal aspect of specimen. 



7. Profile (drawn from a cast of the intaglio side of the nodule enclosing 

 the specimen) showing the dorsal and caudal spines, and the head 

 bent under the anterior segments, but only very imperfectly preserved. 

 Both figures of the natural size. 



Obtained by Dr. W. G-uybon Atherstone, F.G-.S., of Graham's Town, in 

 breaking open a nodule of dark claystone of Silurian (or Devonian?) age; 

 Cock's-Comb Mountains, Cape of Good Hope. 

 The specimen has been presented by Dr. Atherstone to the British Museum. 



Discussion. 



Mr. Evans called attention to the importance of examining the 

 matrix out of which fossil trilobites were extracted, as, were it not 

 for the matrix, the spines on this specimen would have escaped 

 observation. 



Mr. Woodward stated that he had not until the day of the Meeting 

 been able to examine the trilobites collected at the Cape by the late Mr. 

 Bain, and had at first sight doubted whether the fossil he had described 

 might not be identical with Typhloniscus Bainii of Salter ; but on 

 closer examination he was inclined to consider it distinct. He pre- 

 ferred for the present retaining the name of Encrinurus for the genus, 

 but still with some doubt. 



5. On an Extensive Landslip at Glenorchx, Tasmania. 

 By S. H. Wintle, Esq. 



(Communicated by Prof. Eamsay, F.E.S., V.P.G.S.) 



On the 4th of June last this colony was visited by a very heavy 

 rainfall, which continued without intermission -for twenty-four 

 hours, when 4| inches of rain fell, causing most disastrous floods in 

 many parts of the island. "While the citizens of Hobart Town were 

 actively employed in trying to save life and property from the raging 

 torrent that rushed through the heart of the city, news arrived of a 

 most extensive landslip having occurred during the night at Glenorchy, 

 vol. xxix. — part i. d 



