Geological Society of London. 377 



the Ardmillnn Series is of Caradoc-Bala age. The Newlands Series 

 answers to the Llandovery formation of Murchison, containing 

 similar fossils and corresponding local breaks in the succession. 

 The Purple Shales of Penhill correspond in systematic position, 

 petrological features, and fossils with the Tarannon; and the Straiten 

 Beds represent the lower division of the Wenlock. 



The development of the palseontological features of the several 

 zones of life in this succession, and the demonstration of their 

 correspondence with the zones already recognized in the synchronous 

 Lower Palceozoic strata of Moffat, the Lake-District, Scandinavia, 

 and elsewhere, were reserved by the author for a second part of this 

 memoir. 



3. " Notes on the Annelida tiibicola of the Wenlock Shales, from 

 the Washings of Mr. Geo. Maw, F.G.S." By Geo. R. Vine, Esq. 

 Communicated by Prof. P. Martin Duncan, M.B., F.R.S., V.P.G.S. 



The author commenced with a sketch of the bibliography of the 

 subject and of the known Silurian genera of tubicolar Annelids. 

 This was followed by a description of the following genera and 

 their contained species : — Cornulites, Concliicolites, Ortonia, Spi- 

 rorhis. Of the last there is one species (-S. minutus) from the 

 Buildwas Shale; this differs only in the slightest degree from 

 S. arkonensis, described by Prof. Nicholson from the American 

 Devonians. This new genus, Arenatnhulites, is in many respects a 

 peculiar and interesting form, having the tube composed of minute 

 grains of sand, like Sabellaria and Terebella. The author describes 

 two species, A. elongata and A. amplexus ; they occur in the Pick- 

 wood beds. A description follows of the genus Tentaculites, which 

 the author referred to the Tubicolar Annelids, and several species of 

 it were described. 



4. " Description of Part of the Femur of NototJierium Milchelli" 

 By Prof. Owen, C.B., F.R.S., F.G.S., etc. 



The specimen described consisted of the distal portion, probably 

 about one-half, of a femur obtained from Darling Downs, Queens- 

 land, and received by the author from Dr. George Bennett. Its 

 principal differences from Diprotodon are that it has no depression 

 above the outer condyle, but in its place a rough longitudinal rising 

 for the attachment of the same or of a homologous muscle : and 

 the hinder surface of the outer condyle is transversely convex. The 

 relative width of the post-condylar fossa resembles that in Phasco- 

 lomys ; and a further resemblance to the Wombats consists in the 

 more equal prominence of the lateral boundaries of the rotular 

 surface than in Diprotodon and Macropus. The bone differs from 

 the corresponding part in the Wombats by several subordinate cha- 

 racters, and the animal to which it belonged would seem to have 

 been intermediate between Phascolomijs and Macropus. From the 

 size and characters of the bone the author referred it to Nototherium 

 Mitchelli ; its breadth across the condyles is 5f in. 



5. " On Helicopora latispiralis, a new spiral Fenestellid from 

 the Upper Silurian beds of Ohio, U.S." By E. W. Claypole, Esq., 

 B.A., B.Sc. (Lond.), F.G.S. 



