PALEONTOLOGY A. lanceolatus, from Dover — the former being typically from Sussex, while the latter seems to be known solely by Kentish examples. Syllamus anglicus, of which remains have been described from the Chalk of Burham and Dover and the Gault of Folkestone, as well as from Surrey, is allied to the atherines {Crossognathidce). More interesting still is Urenchelys anglkus, typically from the Lower Chalk of Dover, the Kentish representative of a genus of eels [Murcenidce) first described from the North American Cretaceous. In the existing family Berychidce we have remains of the well known Sussex fish Hoplopteryx leivesiensis recorded from the Chalk of Cuxton, Dover, Folkestone, Hailing and Rochester ; while those of H. superbus, likewise typically Sussex, occur at Maidstone and other places in the county. Another member of the same family, Homonotus dorsalis, was described by Dixon on the evidence of an imperfect fish in the Brighton Museum from Mailing, other remains occurring at Bromley, Charing and Northfleet. A well known fish from the Sussex Chalk, named Berycopsis elegans, perhaps belonging to the family Stromateidce (allies of the horse-mackerels), is represented in the county by specimens from Burham, Cuxton and Maidstone. From the Upper Greensand of Maidstone has been described a species of Port Jackson shark under the name of Cestracion sulcatus, apparently the only fish named from that formation in the county. In addition to teeth of the common Cretaceous fish-lizard Ichthyo- saurus campylodon, the Gault of Folkestone has yielded remains of a few reptiles, all but one of which have been named on the evidence of speci- mens from this formation. They include two species of pterodactyles of large size, namely Ornithochirus daviesi and 0. diomedius, the remains of the former having been originally regarded as those of a bird. Also three plesiosaurians, or long-necked marine saurians, respectively named Cimoliosaurus cantabrigiensis, C. constrtctus and C. smithi, the former being typically from the Cambridge Greensand and the latter also occurring in the Kentish Lower Greensand. A species, Rhinochelys elegans, belong- ing to a genus of small marine chelonians occurring typically in the Cambridge Greensand, and taking their name from a peculiarity in the structure of the bones of the nose, has also been named on the evidence of a Folkestone skull. The fishes of the Folkestone Gault, in addition to a few species common to the Chalk already noticed, comprise the following. The comb-toothed sharks are represented by a species recently described from this formation by Dr. A. Smith Woodward under the name of Notidanus lanceolatus, while crushing sharks' teeth from Folkestone have been made by the same author the types of a species of Acrodus, as A. levis. Another cestraciont shark, Synechodus recurvus, typically from the Russian Cretaceous, has also been identified from the Folkestone Gault. Among the porbeagle family there occur remains of Oxyrhina macrorhiza, a species typically from the Swiss Cretaceous, and also of Lamna macro- rhiza, which was named on the evidence of North American specimens. Among the chimaeroids the species Ischyodus thurmanni, originally I 41 6
