426 Reports and Proceedings — 



always worn flat. He also remarked on the peculiar modification of 

 the premolar in the genus Diprotodon. 



8. " Description of Species of Chcetetes from the Lower Silurian 

 Eocks of North America." By Prof. H. Alleyne Nicholson, M.D., 

 D.Sc, F.E.S.E., F.aS. 



In this paper the author accepted the union of Chcetetes and 

 Stenopora made by Milne-Edwards and Haime, and stated that 

 Monticnlipora, D'Orb., and Nebulipora, McCoy, also seemed to him 

 to belong to the same generic group, for which he proposed to 

 employ the name Chcetetes. The genus thus defined he proposed to 

 divide into four groups, under which he described the following 

 North-American species : — 



Group I. Eamose species : — 

 C. Dalei, rugosus, pulchellus, and Fletcheri, M.-Edw. and Haime ; 

 C. gracilis, James ; and C approximatus, attritus, delicatulus, no- 

 dnlosus, Jamesi, and rhombicus, sp. nov, 



G-roup II. Fron descent and Palmate species : — 

 C. mammidatus, M.-Edw. and Haime ; frondosus, D'Orb. (?) ; and 

 clathratulus, James. 



Group IIL Massive and Discoid species : — 

 C. petropoUtanus, Pand. ; and discoideus, James ; and 



Group IV. Encrusting species : — 

 C. papillutus, McCoy ; and corticans and Ortoni, sp. nov. 

 Most of the species are from the Cincinnati group near Cincinnati. 



9. " On the Composition, and Structure of the Bony Palate of 

 Ctenodus." By L. C. Miall, Esq. Communicated by Prof. P. Martin 

 Duncan, F,E,S,, F.G.S. 



The specimen noticed by the author was obtained from the Low- 

 Main Coal-seam of Newsham, Northumberland, The component 

 bones are a parasphenoid and a pair of pterygo-palatals. The left 

 dental plate agrees with the type of Ctenodus cristatus, Agassiz, in 

 the Leeds Museum. The author describes the bones and teeth in 

 detail. He regards Ctenodus as closely related to Ceratodus in the 

 structure of the palate, and as difiering but little from the Devonian 

 Dijiterus. 



10. "Notes on a Eailway Section of the Lower Lias and Ehastics 

 between Stratford-on-Avon and Fenny Compton, and on the occur- 

 rence of the Eh^etics near Kineton and the Insect-beds near Knowle 

 in Warwickshire, and on the recent discovery of the Ehgetics near 

 Leicester." By the Eev. P. B. Brodie, M.A., F.G.S. 



This paper consists of a detailed description of the strata exposed 

 at a little distance from the railway-station at Stratford-on-Avon 

 and at Kineton, and of the evidence of the existence of the Insect- 

 beds near Knowle in Warwickshire. The author also records the 

 discovery of the Ehsetics near Leicester by Mr. Harrison. The 

 following is the section at the brick-pit at the base of the Spinney 

 Hills in ascending order: — twenty feet of red and blue marls, 

 twenty feet of hard fissured sandy marl containing fish-scales, and 



