452 PETRIFACTIONS AND THEIR TEACHINGS. CHAP. V. 



Megalichthys. (M. Hibbertii, carboniferous, Burdie House, near Edin- 

 burgh.) 



Rhizodus. (R. Hibbertii.) 



Pygopterus. (P. Humboldtii, copper slate of Mansfeld.) 



Megalurus. (M. lepidotus.) 



Eugnathus. (E. chirotes, lias of Wirtemberg.) 



Thrissops. (T. formosus.) 



Ptycholepis. (P. Bollensis, lias of Wirtemberg.) 



Pachycormus. (P. gracilis.) 



Caturus. (C. dubius, C. macrodus.) 



Saurichthys. (S. apicalis.) 



Acanthopleurus. (A. serratus.) 



Aspidorhyncus. (A. acutirostris, very fine, from Monte Bolca.) 



Plafcygnathus. (P. Jameson! .) 



Belonostomus. (B. cinctus, from the chalk near Lewes.) 



Acrolepis. (A. asper, from the Keuper schist.) 



Diplopterus. (No species labelled.) 



Holoptychius. (H. Flemingii, H. nobilissimus, from Devonian sand- 

 stone, Clashbinnie, near Perth.) 



Glyptolepis. (G. leptopterus.) 



Asterolepis. (A. Asmusii, Devonian of Riga.) 



Bothriolepis. (B. priscus.) 



Rhinellus. (R. furcatus.) 



Macropoma. (M. Mantelli, Chalk formation, Lewes, Sussex.) 



LophiostomusDixoni. A new ganoid from the South Downs, (ante, p. 433.) 



Phyllolepis, (P. tenuissimus.) 



WALL-CASE C. (15, to 23.) 



Dercetis. (D. elongatus, from the chalk at Lewes.) 



Blochius. (B. longirostris, Monte Bolca ; a very fine example.) 



Acanthopleurus. (A. serratus, chalk formation, slate of Glaris.) 



Pimelodus. (From the Sewalik Hills.) 



Gyrodus. (S. angustus.) 



Pycnodus. (P. gigas, from the Upper Oolite ; P. Mantelli, Wealden.) 



Platysomus. (P. gibbosus.) 



Placodus. (P. gigas, from the Muschelkalk of Franconia.) 



Acrotemnus. (A. faba, Sussex chalk.) 



Silurus. (S. Egertoni, eocene clay, Bracklesham, Sussex.) 



Sphserodus. (S. gigas, from the Oolite.) 



Phyllodus. 



Microdon. (M. nuchatis, Lewes chalk ; M. hexagonus, Monte Bolca.) 



Perca. (P. lepidota, from (Eningen ; very fine.) 



Cyclopoma. (C. gigas, Monte Bolca.) 



Pelates. (P. quindecimalis, Monte Bolca.) 



Serranus. (S. occipitalis.) 



Beryx. (B. Lewesiensis, Mantell, B. ornatus, Agassiz, Lewes chalk, dis- 

 covered in 1820.) 



(B. radians, B. microcephalus, and B. superbus, from the 



Lewes chalk.) 



Smerdis. (S. minutus, Eocene, Aix, Provence.) 



Rhacolepis. (R. Brama, R. latus, from the chalk formation of Brazil.) 



