5588 Geological Society. 



forms of cartilaginous fishes, and a few vertebrae of bony fishes, resem- 

 bling those procuredinSheppey.havebeenfound, also three new genera 

 of fishes. For the latter Dr. Buckland proposes the names of Eda- 

 phodon, Passalodon, and Ameibodon. In the first genus the struc- 

 ture of the teeth is nearly allied to that of the broad and flat palates 

 so common in the oolitic and carboniferous limestones. There were 

 three of these teeth in the upper jaw, and three in the lower on each 

 side, and they were disposed so as to form a pavement, arming the 

 interior of the mouth with powerful instruments for crushing shells. 

 Their surface is pitted with minute depressions, disposed in nearly the 

 same manner as in the genus Psammodus. The body of each tooth 

 also, as in Psammodus, is composed of hollow, long, cylindrical co- 

 lumns, placed nearly at right angles to the working surface. The 

 bones to which the teeth are attached, are not granulated as in car- 

 tilaginous fishes ; but are cancellated after the manner of bony fishes. 

 The mode of insertion of the teeth in both jaws offers many pecu- 

 liarities, as they are placed in nearly horizontal, long sockets, and 

 maintained by continual growth from the posterior extremity of each 

 tooth. Details were given of the genera Passalodon and Ameibodon ; 

 and it was stated that Edaphodon and Passalodon oflfer combinations 

 of the characters of cartilaginous and bony fishes. In the stratum 

 in which these remains were found, Mr. Sibthorpe has also dis- 

 covered portions of the carapace of an Emys, resembling that of the 

 London clay; and Sir Philip Egerton possesses a fragment of a tooth 

 found at Sheppey resembling the teeth of the Edaphodon of Gold- 

 worth Hill. From the agreement, therefore, in the fossils of that lo- 

 cality with those of the London clay, Mr. Lyell's opinion, that the 

 Bagshot sand was deposited during the eocene period, has received 

 additional support. 



A notice, by Dr. Buckland, was afterwards read " On the disco- 

 very of a fossil wing of a Neuropterous Insect in the Stonesfield 

 slate." 



ITie elytra of several species of coleopterous insects have been, for 

 some time, known to occur in the Stonesfield slate, but Dr. Buck- 

 land believes that this is the first discovery of any remains of Neuro- 

 ptera. The wings of Libellulce are not unfrequent at Solenhofen ; 

 and a neuropterous wing, resembling that of a Corydalis, has been 

 discovered by Mr. Mantell in an ironstone nodule from Coalbrook 

 Dale. To the notice was appended a description of the wing by 

 Mr. Westwood, from which the following is an extract: — "I have 

 compared the fossil insect wing with the various genera of neuro- 

 pterous insects, both indigenous and exotic, but it agrees with none 

 of them. I apprehend there can be no doubt that it belonged to a 

 tetrapterous insect, and to the order Neuroptera." 



Dr. Buckland proposes to call the fossil insect Hemerobidides gi- 

 ganteus, from its being more nearly allied to the recent genus Heme- 

 robius than to any other at present known. 



The last paper read was on some species of Orthocerata ; by Charles 

 Stokes, Esq., F.G.S. 



In Dr. Bigsby's paper on the geography and geology of Lake 



