90 University of Washington Publications in Geology [Vol. 1 



width and contain no revolving threads ; the middle portion of the whorl possesses 

 four very prominent revolving ribs which are equally spaced and which when 

 crossing the longitudinal ribs form fairly well developed nodes; between each of 

 these four prominent ribs there are three less well defined minor ribs of about 

 the same magnitude as those on the upper third of the surface of the body whorl; 

 between each of the minor ribs are interspaces of approximately equal width but 

 containing no ornamentation. The lower portion of the body whorl including the 

 canal is ornamented with 13 equally developed and fairly prominent rounded 

 revolving ribs with interspaces of triple width ; in the middle of each interspace 

 is a minor revolving thread; canal about one and one-half times as long as the spire, 

 twisted to the left and backward; aperture elliptical and terminating in an open 

 canal ; inner lip moderately calloused, callous extending for some distance over on to 

 the sculpture of the body whorl ; outer lip thin. 



This species differs from Hemifusus washingtonensis Weaver in possessing a 

 longer canal which in all specimens of the species is reflected backwards. Hemifusus 

 washingtonensis is characterized by having a straight canal. 



Dimensions Altitude of shell 33 mm. ; altitude of spire 8 mm. ; maximum 

 diameter of shell 16 mm.; angle of spire 53. 



Occurrence At locality 352 (University of Washington Paleontological Col- 

 lection) in cuts on the line of the O.-W. R. R. & N. Co., one-fourth mile west of 

 Lincoln Creek Station, in Section 27, Township 15 North, Range 3 West. 



Horizon Lower Oligocene; Molopophorous lincolnensis Zone. 



GENUS PSEUDOLIVIA SWAINSOX 



PSEUDOLIVIA PACKARDI n. Sp. 



Plate VII, Figure 16 



Description Shell minute, smooth and moderately thick ; whorls four in number ; 

 spire very inconspicuous; body whorl swollen; suture linear and indistinct; aperture 

 elongate, narrow at posterior end but gradually increasing in width toward the 

 anterior end where it merges into a very short canal, which is slightly notched. 



Dimensions Altitude of shell 4 mm. ; altitude of spire .75 mm. ; maximum 

 diameter of shell 2 mm.; angle of spire 82. 



Occurrence At locality 330 (University of Washington Paleontological Col- 

 lection) situated at the Greece ranch, four miles east of Vader, on the east bank of 

 Cowlitz River, in Section 25, Township 11 North, Range 2 West. 



Horizon Lower Oligocene; lower phase of Molopophorous lincolnensis Zone. 



