470 Scientific Intelligence. 



pis. 31-33. — This excellent paper describes and illustrates in detail 

 the large marine turtle Protostega gigas, of which two good 

 specimens have recently been secured by Mr. Sternberg for the 

 Pittsburg Museum. Cope estimated the entire length of this 

 turtle to be 13 feet, but a restudy of the original specimen com- 

 bined with this new material has shrunk the animal to a length 

 of less than 6 feet. However, Wieland has elsewhere described 

 a Cretaceous turtle from Dakota, Archelon, having a length of 

 13 feet. c. s. 



6. Hie Osteology of Diplodocus Marsh ; by W. J. Holland. 

 Mem. Carnegie Mus., Pittsburg, Pa., ii, 1906, pp. 225-264 1 pis. 

 23-30. — This paper treats of the additional material of the 

 Diplodocus carnegiei collected since Hatcher's account published 

 in the first volume of the same memoirs, and of the restoration of 

 this animal recently presented by Dr. Carnegie to the British 

 Museum of Natural History. Dr. Holland describes and figures 

 in detail the fine skull secured by Mr. Utterback in 1902, and a 

 fourth fine skull in the American Museum of Natural History. 

 The author does not at all believe in the presence of a pineal eye 

 at maturity in Diplodocus. Other parts described in detail are : 

 The atlas, sternal plates, and supposed clavicle. Brief remarks 

 are also made on the dorsal, sacral, and caudal vertebrae, and the 

 chevrons. c. s. 



7. A New Ruminant from the Pleistocene of JYeio Mexico ; 

 by J. W. Gidley. Proc. U. S. Nat. Mus., xxx, 1906, pp. 165- 

 167. — Describes an incomplete skull of a new bovine genus Liops 

 from Juni, New Mexico. 



8. Report on the Lead and Zinc Deposits of Wisconsin with 

 an Atlas of detailed maps; by Ulysses Sherman Grant. Wis- 

 consin Geological and Natural History Survey. Bulletin No. 

 XLV. 100 pp., 26 pis., 10 figures in text. — This is a brief report 

 on the geology of that portion of the Upper Mississippi Valley 

 lead and zinc district that lies in the southwestern corner of 

 Wisconsin. This area is one that is covered entirely by early 

 Palaeozoic sedimentary deposits, there being no igneous or meta- 

 morphic rocks exposed although such rocks have been proven by 

 means of deep borings to exist beneath the sedimentary series. 

 The oldest sedimentary rock is the Potsdam sandstone, of Cam- 

 brian age. Upon this lies a dolomite, called the Lower Magnesian, 

 which in turn is overlain by the St. Peter sandstone. Then come 

 the two limestones, the Platteville (or Trenton) and the Galena 

 formations in which lie the bulk of the productive ore deposits. 

 These are covered with a shale series called the Maquoketo. All 

 of these rocks belong to the Ordovician. In isolated places 

 remnants of an upper Silurian limestone, the Niagara, are found. 



Throughout the district as a whole the rocks have a low south- 

 west inclination. In addition to this general monoclinal structure 

 the district is covered by a series of gentle rolls of the strata, 

 whose axes run approximately east and west. Most of the forma- 

 tions show a pronounced series of joints. These are especially well 



