II. 



PALEONTOLOGY. 



(a) 



A NEW TRILOBITE. 



In the registration of specimens lying in the university building in 1873, a lot 

 of miscellaneous rocks, minerals and fossils was found that had been presented 

 by the late Dr. Stoneman, of Minneapolis. The fossils and rocks were evidently 

 from the Trenton at Minneapolis; but as there were no certain records respect- 

 ing them, they were all entered in the register, and finally published, with the 

 note "records doubtful.'' (Fifth onniial report, Tp. 207.) A slib of fossiliferous 

 limestone (Mus. reg. number 90) was thus referred to the Trenton. In the sixth 

 annual report a fossil trilobite, contained on this limestone, was reported after a 

 casual examination as Asaphus extans, of Ball {loc. cif. p. 161), with the remark 

 that it "has a tuberculated surface instead _pf lamellose.'' 



In March, 1879, at tbe request of Lieut. A. W. Vogdes this specimen was sent 

 to him, and he kindly returned the specimen with the following description, as 

 a new species, naming it in honor of Dr. Stoneman. 



Bathyurus Stonemanii, Vogdes. 



Description. — The pygidium is semi-elliptical, strongly convex, 

 and the width a little greater than the length. The anterior mar- 

 gins are rounded, and the outer margins bordered by a well-defined 

 convex limb. The axis is greatly elevated above the sides, and 

 tapers toward the posterior margin, terminating on the limb. The 

 axis is marked with six rings, the first three being well-defined, 

 and the others not so prominently marked. The dorsal furrows 

 are deep and well-defined. The lateral lobes are convex and have 

 five plfurae, each being separated by deep furrows. The pleurae 

 are bent downward and backward, and arise from the second, third, 



