1922] Fauna from the Eocene of Washington 27 



Gastropoda 



GENUS FISSURIDEA SWAINSON 



FlSSURIDEA STlUvWATERENSIS n. Sp. 



Plate XI, Figures 3, 6 



Description. Shell medium in size, outline elliptical ; apex situated a little 

 in advance of the middle ; anterior slope moderately steep ; angle of the posterior 

 slope less than that of the anterior; surface ornamented with about 28 primary, 

 radiating ribs between which are ribs secondary in size, in most cases there is a 

 third, smaller, radiating rib between the primary and secondary ribs ; the alterna- 

 tion in the size of the ribs is most conspicuous nearer the apex of the shell and 

 on the anterior and posterior slopes ; the radiating ribs are crossed by numerous, 

 revolving lines which give the shell a close, cancellated appearance. 



In size, shape and general rib arrangement this shell resembles Fissuridea 

 alabama (Harris), (Bull. Amer. Pal. Ill, No. 11, p. 102, pi. 12, fig. 23, 1899) 

 from the Sabine Eocene of Alabama, but from which it differs in having a greater 

 number of primary ribs and in a greater tendency for the intervening ribs to be 

 produced into secondary and tertiary, there never being more than three smaller 

 radiating ribs between the primaries. 



The type locality for this species is at 319 on the Stillwater Creek, Lewis 

 County. An eroded specimen of this same species was found at locality 347, on 

 Coal Creek, Cowlitz County. No other species of this genus has been described 

 from the west coast Eocene. 



Dimensions. Greater diameter 19 mm. ; lesser diameter 13 mm. ; altitude 8 

 mm.; apical angle 113. 



Occurrence. At locality 319 (type) (University of Washington Palaeonto- 

 logical Collection) McClarety ranch on south bank of Stillwater Creek, one 

 mile west of Vader, Lewis County, Section 30, Township 11 North, Range 2 

 West ; locality 347, back of Leybo place about one mile below old Inman-Polson 

 camp, on Coal Creek, Cowlitz County, Section 27, Township 9 North, Range 3 

 West. 



GENUS SOLAR I ELL A s. WOOD 



SOLARIELI,A OIvEQUAHENSlS n. Sp. 



Plate XII, Figures 10, 12 



Description. Shell small ; whorls five angulated ; aperture round ; suture im- 

 pressed, slightly channelled ; body whorl sharply angulated at the base ; between 



