310 6v Baur — Palceohatteria and the Proganosauria. 



Fig. 19. Vertical longitudinal section of 5 shaft between the 5th and 6th 

 levels. Dotted lines are lines of equal chemical composition. 



Fig. 20. Vertical longitudinal section of 5 shaft between 5^ and 6 levels, show- 

 ing ore in winzes and its relation to ore in drifts. 



Fig. 21. Vertical longitudinal section of 5 shaft between the 7th and 8th levels, 

 showing depth of winzes and distances along drifts, and method of establishing 

 an isochemic line. 



Fig. 22. Vein map of 6 level, Ludington mine. 



Fig. 23. Sketch map of the isochemistry of 5 shaft from surface to the 8th 

 level. The dark lines represent high phosphorus ore, the open spaces and ar- 

 rows low phosphorus ore and its direction of increase. The space covered by 

 these lines and the figures is the ore deposit in part worked out. The jasper at 

 the left shows the western limit of the ore deposit. The jasper occurring to the 

 right of this constitutes what is known as horses of rock splitting up the vein and 

 breaking the regularity of the deposit. 



These figures are drawn from maps made by Mr. Chas. N. Snow, engineer of 

 the Ludington mine, Mr. Per Larson, engineer of the Chapin mine, and Mr. E. 

 Everett of Ishpemmg, to whom I am much indebted for their kind assistance in 

 the preparation of this paper. 



Art. XXXIII. — Palceohatteria Credner, and the Progano- 

 sauria • by Dr. G. Baur. 



One of the most important discoveries in Paleontology 

 has just been made by Professor H. Credner of Leipzig, well 

 known by bis publications on the Stegocephalia of the Permian 

 of Saxony.* 



This discovery consists of a series of nearly complete skele- 

 tons of a reptile from the lower Permian (Bothliegendes). 

 This reptile, with the exception of /Stereosternum Cope, from 

 the Carboniferous (?) of Brazil, is the oldest yet known. Pro- 

 fessor Credner calls it Palwohatteria from the close resemblance 

 to Hatteria from ~New Zealand, the only living member of 

 the Khynchocephalia. But since Hatteria is preoccupied by 

 Sjphenodon^ this new form really ought to be called Palceo- 

 sphenodon. It is t placed by Professor Credner among the 

 Sphenodontidse, but it has to be considered as the type of a 

 distinct family, which may be called the Palceo hatter •iidce, or 

 PalcBOSj)henodontidce, in case the name Palososphenodon shall 

 be admitted by Credner. 



Characters of the Palceohatteriidce. — Skull resembling 

 Sphenodon ; lacrymal free from prefrontal ; bones showing 

 centers of ossification, like those of Stegocephalia ; interclavicle 



* Credner, Hermann : Die Stegocephalen und Saurier aus dem Rothliegenden 

 des Plauenschen Grundes bei Dresden, vii Theil. Palceohatteria longicaudata 

 Cred. Zeitschrift Deutsch. Geol. Gesellsch., 1888. 



\ Sphenodon Gray, 1831; Sphenodon Lund, 1839 (Mamm.) ; Hatteria Gray, 

 1841 ; Sphenodon Agass. 1843 (Fish.) Baur, G, Erwiderung an Herrn Dr. A. 

 Gunther. Zool. Anz., No. 245, 1887. 



