PROGRESS IN VERTEBRATE PALEONTOLOGY 453 



Another pinniped — this time a walrus — has been named on 

 the evidence of one-half of a lower jaw derived from a Miocene 

 Tertiary littoral deposit at Yorktown, Virginia. It has been 

 described by Messrs. Berry and Gregory in the American 

 Journal of Science for June last as representing a new genus 

 and species, under the name of Prorosmarus alleni. 



Before leaving this portion of the subject it may be added 

 that, in the paper already cited, Mr. Condon expresses the 

 belief that seals have originated from terrestrial (creodont ?) 

 Carnivora. This, it may be observed, is in direct opposition 

 to the view of Dr. Andrews, who (in the volume cited above) 

 states that certain presumably aquatic creodonts, with otter- 

 like limb-bones, may have been the progenitors of the modern 

 Pinnipedia (or, at all events, one section of that group). 



A paper by Mr. O. A. Peterson, published in the Memoirs 

 of the Carnegie Museum, Pittsburgh (ii. art. 8), on new 

 Suilline remains from the Miocene of Nebraska, is devoted to 

 the description of the osteology of a new peccary of the genus 

 Thinohyus. A second, by Mr. F. B. Loomis, on Eocene Primates, 

 published in the American Journal of Science, is likewise merely 

 descriptive. 



Two memoirs on the mammals of the Santa Cruz beds, 

 Patagonia, have already received mention. Besides these, two 

 others, by Prof. Albert Gaudry, on the same subject have been 

 published in the first volume of the new Paris journal Annates 

 de Paleontologie. In the first of these the author discusses the 

 attitudes of many of these Patagonian ungulates, as deduced 

 from the articular surfaces and proportions of their limb-bones ; 

 contrasting them at the same time with European types. In the 

 second memoir, on the other hand, the fossil Patagonian fauna 

 is discussed as a whole in connection with its bearing on the 

 theory of a great Antarctic continent. 



As regards the Pleistocene mammals of South America, the 

 only memoir that has come under the writer's notice is one 

 by Mr. Max Rautenberg, of Breslau, on the skeleton of a 

 ground-sloth from the Arroyo Pergamino, Argentina. It is 

 described in vol. liii. of the Stuttgart Palo3ontographica as a new 

 species of that group of mylodons which is often separated 

 from the typical genus on account of peculiarities in the 

 dentition and the shortness of the nasal bones, as Pseudolcstodon. 

 The name P. hexaspondylus, by which it is designated, may 



