iv 
CONTENTS. 
XII.  Observations  on  the  Neck  of  the  Three-toed  Sloth,  Bradypus  tridactylus,  Linn.  By 
Thomas  Bell,  Esq.,  F.R.S.,  L.S.,  G.S.,  8^  Z.S  page  113 
XIII.  On  the  Anatomy  of  the  concave  Hornbill,  Buceros  cavatus,  Lath.  By  Richard 
Owen,  Esq.,  F.Z.S.,  Assistant  Conservator  of  the  Museum  of  the  Royal  College  of 
Surgeons  in  London  117 
XIV.  Description  of  a  New  Genus  of  Acanthopterygian  Fishes.    By  the  Rev.  R.  T. 
Lowe,  B.A.,  Corr.  Memb.  Z.S.    (In  a  Letter  to  the  Secretary.)     .    .    .  123 
XV.  On  the  Anatomy  of  the  Cheetah,  Felis  jubata,  Schreb.    By  Richard  Owen,  Esq., 
F.Z.S.,  Assistant  Conservator  of  the  Museum  of  the  Royal  College  of  Surgeons 
in  London  129 
XVI.  Notice  of  a  Mammiferous  Animal  from  Madagascar,  constituting  a  new  Form  among 
the  Viverridous  Carnivora.   By  E.  T.  Bennett,  Esq.,  F.L.S.,  Sec.  Z.S.  .  137 
XVII.  Descriptions  of  some  new  Species  of  Cuvier's  Family  of  Brachiopoda.  By 
W.  J.  Broderip,  Esq.,  Vice-President  of  the  Geological  and  Zoological  Societies, 
F.R.S.,  L.S.,  8fc  141 
XVIII.  On  the  Anatomy  of  the  Brachiopoda  of  Cuvier,  and  more  especially  of  the  Genera 
Terebratula  and  Orbicula.  By  Richard  Owen,  Esq.,  F.Z.S.,  Assistant  Con- 
servator of  the  Museum  of  the  Royal  College  of  Surgeons  in  London  .    .    .  145 
XIX.  Some  Account  of  the  maneless  Lion  of  Guzerat.  By  Capt.  Walter  Smee,  of  the 
Bombay  Army,  F.Z.S  165 
XX.  Description  of  a  nev)  Species  of  the  Genus  Eurylaimus  of  Dr.  Horsfield.  By 
Mr.  John  Gould,  F.L.S.    Communicated  by  the  Secretary  175 
XXI.  A  few  Remarks  tending  to  illustrate  the  Natural  History  of  two  Annulose  Genera, 
viz.  Urania  of  Fabricius,  and  Mygale  of  Walckenaer.  By  W.  S.  MacLeay,  Esq., 
F.Z.S. ,  8fc.   179 
XXII.  Descriptions  of  some  new  Species  of  Calyptrseidae.  By  W.  J.  Broderip,  Esq., 
Vice-President  of  the  Geological  and  Zoological  Societies,  F.R.S.,  L.S.,  ^c.  195 
XXIII.  On  the  Anatomy  of  the  Calyptrseidse.  By  Richard  Owen,  Esq.,  F.Z.S.,  Assistant 
Conservator  of  the  Museum  of  the  Royal  College  of  Surgeons  in  London  .    .  207 
XXIV.  On  the  Structure  of  the  Heart  in  the  Perennibranchiate  Batrachia.  By  Richard 
Owen,  Esq.,  F.Z.S.,  Assistant  Conservator  of  the  Museum  of  the  Royal  College 
of  Surgeons  in  London  213 
XXV.  On  the  Young  of  the  Ornithorhynchus  paradoxus,  Blum.  By  Richard  Owen, 
Esq.,  F.Z.S.,  Assistant  Conservator  of  the  Museum  of  the  Royal  College  of  Sur- 
geons in  London  .  221 
XXVI.  Notes  on  the  Natural  History  and  Habits  of  the  Ornithorhynchus  paradoxus, 
Blum.    By  George  Bennett,  Esq.,  F.L.S. ,  Corr.  Memb.  Z.S  229 
