82 Reviews — Dr. H. M. Sovelacque — On " the Wooden Dinosaur." 



of its affinities has not been attained. So far as the terms of the 

 " generic definition " are concerned, the name will apply equally 

 well to a sole or a sun-fish ; but the fine figures and detailed descrip- 

 tion of the fossils help to compensate for the insufficiency of the 

 diagnosis. 



The memoir as a whole makes an important advance in our know- 

 ledge of the Upper Cretaceous Fishes of Western Europe, and 

 ichthyologists are much indebted to the author for providing so 

 many new facts that will assist in future generalizations. 



A. S. W. 



III. Dr. E. EaBRINI on MACHiEBODUS. 



Mach^kodus (Meganthereon) del Valdarno Superioeb, Memoria 

 DEL DoTT. Emilio Fabrini. (BoU. E, Com. Geol. 1890, 

 Nos. 3-6, pp. 43, pis. 3.) 



I^HE present Memoir is another of the series intended to illustrate 

 the extinct Mammalian fauna of Italy, reference to which has 

 already been made in our issue of last month. 



The author describes in full detail, with excellent illustrations, 

 all the more important remains of Sabre-toothed Tigers [Machcerodiis) 

 from the Pliocene of the Yal d'Arno preserved in the Italian 

 Museums. He concludes that two species have hitherto been 

 confused together under the name of M. cultridens. In that species 

 the upper canine teeth of the male are long and narrow, and have 

 no serrations on their trenchant edges ; and it is believed that the 

 smaller skulls and jaws which have been regarded as representing 

 a distinct species — M. meganthereon — are really referable to females 

 of M. cultridens. A second new species designated M. crenatidens 

 is distinguished by the shorter and wider canine teeth of the males, 

 in which both the front and hind edges are strongly serrated. In 

 accordance with the oontour of the canine the hollow in the flange 

 of the lower jaw, against which they are applied, is likewise 

 unusual. It is considered that the lower jaw from the Norfolk 

 Forest-bed, described by the late Mr. Backhouse in the Geological 

 Society's Journal, is referable to this form, whereby a new species 

 is added to the British Fauna. 



A second new species, which it is proposed to designate M. 

 nestianus, is characterized by the upper canine teeth carrying 

 serrations only on their hinder edges ; and likewise by the long 

 gap separating the third and fourth premolars in the lower jaws. 

 It is suggested that it may be advisable to regard this species as the 

 type of a new genus, in which case the name Homotherium might be 

 adopted. E. L. 



IV. — SUR LA NATURE VeGETALE DE l'AaCHENOSAURUS MULTIDENS, 



G. Smets. Par Dr. Maurice Hovelacque. (Mem. Soc. Beige 



de Geol. iv. (1890) p. 59 et seq.) 

 niHE "wooden Dinosaur" — as the so-called AacTienosaurus multidens 

 JL has not inaptly been termed on this side of the Channel — has at 

 length received its coup de grace at the hands of the author of this 



