70 Geological Society : — 



few inclies; 2. Reddish marl, 4 inches; 3. Green marl, 4 inches; 

 4. Light-coloured, fine-grained sandstone divided by marls, 3 feet, 

 with Posidonomya minuta. Fish-bones, and Ripple-mark; 5. Gritty 

 sandstone, with teeth oiAcrodvs, and fish-bones and spines, 8 inches ; 

 6. Green marl, \ inch ; 7. Hard sandstone, with Posidonomya, 10 

 inches ; 8. Sandstone divided by green marls, 10 feet, with remains 

 of Plants, Vollzia &\\d Calamites} 9. Red marl. Bones oi Labyrin- 

 thodon were met with ; and Foot- tracks also occur, but their place 

 in the series was not determined. Fucoidal markings are frequent 

 throughout ; and ripple-mark is common in the sandstones. The 

 Warwickshire Keuper very nearly agrees with that of Worcestershire, 

 as described by the Rev. Mr. Symonds, but at Pendock the bed 

 No. 5 is coarser, is still richer in osseous remains, and contains car- 

 bonaceous matter. 



3. " On a new genus of Cephalopoda, Diploceras (Orihoceras 

 bisiphonatum of Sowerby). By J. W. Salter, Esq., F.G.S. 



In this communication the author pointed out the apparent rela- 

 tions of this peculiar form, which has been figured in the ' Silu- 

 rian System ' and in * Siluria.' It possessed ordinary septa, pierced 

 by an excentric beaded siphuncle, and also had a deep lateral cavity 

 passing down side by side with the siphuncle, and affecting at least 

 seven, if not more of the uppermost septa. 



Mr. Salter remarked that the structural peculiarities of Ortho- 

 ceras paradoxicum and of Gonioceras might elucidate the character of 

 the shell in question ; but he thought that the study of Ascoceras and 

 Cameroceras would be still more likely to throw light on the subject. 

 Mr. Salter also described a new species oi Ascoceras (A. Barrandii), 

 found not long since in the upper Ludlow rock, at Ludlow, and at 

 Stansbatch in Herefordshire. 



4. " On an Orthoceras from China." By S. P.Woodward, Esq., 

 F.G.S. 



The specimen in question was one of several that were imported 

 from China in 1854 by Mr. D. Hanbury. They are longitudinal 

 sections in thin, polished slabs of limestone, and were obtained by 

 Mr. Lockhart, of Shanghae, from some place 200 miles distant. 

 They seem to have been used as screens, having been mounted in 

 carved wooden frames with stands. Mr. Woodward described in 

 detail the appearances presented by the fossil in question, which is 

 probably of Devonian age, and offers some interesting facts as to 

 the original relations of the siphuncle, the lining membrane of the 

 shell, and other parts of the animal. The specimen exhibits appear- 

 ances attributed to the gradual separation and ultimate colla])se of 

 the lining membrane from the wails of the air-chambers towards the 

 apex of the spire, during the life-time of the animal. 



He stated that the changes which this specimen has undergone 

 appear to be these, — 1 . When buried in the sea-bed, the mud entered 

 the sii)huncle and filled the interior of those chambers in which the 

 siphuncle was incomplete. 2. Water, containing carbonate of lime 

 in solution, penetrated the air-chambers and other closed spaces. 



