164 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Class G^^STI^OI^OD^. 



Family PEOTOWAETHIID^ Ulrich. 



PROTOWARTHIA PERVOLUTA Ulrich and Scofield. 



Protoivarthia pervoluta Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 871, 

 pi. LXiii, figs. 21-27. 



This species is fairly common at Silliman's Fossil Mount, and in some 

 specimens the shell is preserved. Testiferous examples of P. pervoluta 

 are distinguished from other species of the genus by the columella-like 

 development of the inner lip. The specimens were sent to Mr. Ulrich, 

 who has compared them with his types. He writes that the Arctic 

 examples are somewhat more angular on the back of the volutions than 

 the type specimens. 



Collectors.— J. N. Oarpender and A. H. White. Cat. No. 28173, 



U.S.N.M. 



Family BUCANIID^ Ulrich. 



TETRANOTA OBSOLETA Ulrich and Scofield, 



Tetranota ohsoleta Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 880, pi. 

 Lxv, figs. 19-23. 



Of this widely distributed shell there are eight examples in the 

 present collection. Three were sent 'to Mr. Ulrich, who pronounced 

 them typical examples of his T. ohsoleta. 



In the United States, this shell ranges from the Lowville stage into 

 the Utica, and is found in Minnesota, Wisconsin, Kentucky, and at 

 Cincinnati, Ohio. 



Collectors.— J. N. Carpender and A. H. White. Cat. No. 28175, 

 U.S.N.M. Three specimens collected by Mr. R. W. Porter are in the 

 American Museum of Natural History. 



KOKENIA COSTALIS Ulrich and Scofield. 



Kokenla costalis Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 882, pi. 

 LXiv, figs. 46-49. 



Two specimens of this interesting species, from the Galena shales of 

 Goodhue County, Minnesota, the type locality for this species, are in 

 the United States National Museum. The two specimens from Fro- 

 bisher Bay agree with the present examples in every way excepting in 

 the number of revolving lines. Of these there are seven in the Minne- 

 sota specimens, while in* the Arctic individuals there are from eleven 

 to twelve, of which the fourth, sixth, and eighth are the inost prominent. 

 The first, second, fourth, sixth, and eighth revolving lines are continu- 

 ous into the aperture, the others being interpolated on the last volution. 

 Extremely fine transverse lines of growth and a few varices indicating 

 stages of growth are also present. 



Collector.— J. N. Carpender. Cat. No. 28176, U.S.N.M. 



