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 NEW PUBLICATIONS. 



1. Zoology of the Voyage of H. M. Ship Beagle, under the Command of 

 Captain Fitzroy, during the Years 1832 to 1836. 4to. Smith, Elder, 

 and Company, London. 



The only Number of this work published since our last 

 notice at page 433 of former volume (vol. xxvi.), is No. 3. of 

 Part I. of the Fossil Mammalia, by Mr Owen. 



Mr Owen, in this Number, concludes his account of the 

 fossil remains of his new subgenus Mylodon with the follow- 

 ing summary : — " From the preceding descriptions, it Avill be 

 seen that the lower jaw of the Mylodon (the only part of the 

 animal hitherto met with), is very different from that of the 

 Megatherium ; with that of the Megalonyx we have at present 

 no means of comparing it. Among existing Edentata, the 

 Mylodon, in the form of the posterior part and angle of the 

 jaw, holds an intermediate place between the Ai and the great 

 Armadillo ; in the form of the anchylosed symphysis of the 

 lower jaw, it resembles most closely the Unavi or two-toed 

 sloth ; but in the peculiar external configuration of the symphy- 

 sis, resulting from the mammilloid processes above described, 

 the Mylodon presents a character which has not hitherto been 

 observed in any other species of Bruta, either recent or fossil." 

 The descriptions are illustrated by two plates, executed in the 

 usual style of excellence of this work. To the description of 

 the Mylodon follows that of a considerable part of the skeleton 

 of a large Edentate mammal, allied to the Megatherium and 

 Orycteropus, and for which Mr Owen proposes the name of 

 Scelidotherium Leptocephalum (from 2;«eX/s, femur ; dri^iov, bel- 

 lua ; in allusion to the disproportionate size of the thigh-bone). 

 The Cape ant-eater (Orycteropus), of all Edentata, most 

 nearly resembles the present fossil in the form of its cranium, 

 and next in this comparison the great Armadillo (Dasypus 

 gigas, Cuvier), may be cited. Although the Scelidotherium, 

 like most other Edentals, appears to have been of a low sta- 

 ture, and, like the Megatherium, presents a disproportionate 

 development of the hinder parts, it is probable, says Mr Owen, 

 that, bulk for bulk, it equalled, when alive, the largest exist- 



