No. 556] NOTES AND LITERATURE 



253 



two new species of Miocene rhinoceroses and a "Faunal Lists 

 of the Tertiary Formations of Sioux County, Nebraska." These 

 formations extend from the Lower Oligocene to the Pleistocene 

 and many species are listed, 11 pages being taken up with the 

 lists. Peterson, 18 however, states that one of the above species 

 was based on a deciduous dentition. 



Dr. R. S. Lull in the Yale Alumni Weekly of November 8, 

 1912, gives a very interesting account of his expedition to Texas 

 in search of the remains of early horses, which he found in 

 abundance. 



Broili 19 has described very carefully a new specimen of 

 Pterodactylus micronyx H. von Meyer from the lithographic 

 slates of Eichstaedt in Bavaria. The nearly complete animal 

 is seen from the dorsal side as it lies in the stone. 



The same author 20 describes and figures very fully the 

 osteology of the skull of Placodus based on a series of specimens 

 of this peculiar, primitive, yet highly specialized reptile. On 

 page 151 are given four reconstructions of the dorsal, ventral, 

 lateral and occipital views of the skull. The animal is very 

 peculiar in many ways and of very uncertain relationship, being 

 assigned to several reptilian groups by the various authors 

 who have studied the species. The maxillary and palatine teeth 

 have the unusual form of pavement crushing teeth, the palatine 

 teeth are especially large and broad, the middle one of the 

 three on each palatine measuring nearly one by two inches. 

 That the animal was a feeder on molluscs or hard vegetation 

 would seem quite probable. Zittel in his "Handbuch der 

 Paleontologie" lists six species of this genus; the one described 

 by Broili being P. gigas Ag. The animal possesses a single 

 temporal opening in the skull and amphiplatyan vertebra?, with 

 the nostrils located far back on the skull with the nasals reduced, 

 indicating an aquatic habit of life. 



In the American Journal of Science for November, 1912, S. 

 "W- Williston describes and figures further portions of the 

 osteology of the peculiar Permian reptile Limnoscelis from New 

 Mexico, together with a restoration of the skeleton of the speci. 

 L. pahidis Will. Nearly the entire osteology of the species ' 

 "Science, December 6, 1912, p. 801. 



" Zeitschrift der Bevtschen Gcoloqifichen Gesclhchaft. Bd. 64. J- 

 1912, H. 3. 



"Paleontographiea, Bd. LTX, pp. 149-155, with figures and Taf. XIV. 



