72 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



eighteen low, rounded axial ribs and numerous spiral cords 

 which alternate in size ; the spiral sculpture on the penultimate 

 whorl consisting of four pair of double strap like cords, between 

 each pair of which are three less prominent cords, the middle 

 one being slightly larger than those on either side; the inter- 

 spaces are narrower than the cords ; the double cords produce 

 nodulation on the axial ribs ; two rugose discontinuous varices 

 crossing each whorl from suture to suture ; entire surface faintly 

 spirally striate ; canal and aperture partly defective. 



Dimensions: — Altitude of the figured specimens, 65 mm.; 

 maximum diameter of the body-whorl, 44 mm. 



Occurrence : — From the Miocene of the Oregon coast, four 

 and one half miles north of Yaquina Bay, locality 35. 



This species can be distinguished from Argohuccinum ore- 

 gonense Redfield by a difference in the spiral sculpture and 

 more prominent varices. 



Type: — No. 152, Cal. Acad. Sci., Lincoln County, Oregon, 

 along the sea clifT a little south of the mouth of Wade Creek, 

 about six miles north of Yaquina Bay. 



Named in honor of Prof. J. S. Diller, Geologist, U. S. Geo- 

 logical Survey. 



Genus AMPHISSA 



Amphissa posunculensis, new species 



Plate 7, figures 11a and lib. 



Shell small, thin, bucciniform, with about seven whorls ; spire 

 elevated; apex subacute; whorls well rounded and distinctly 

 cancellated with small rounded axial ribs, separated by much 

 wider interspaces and numerous spiral cords; the axial ribs 

 are slightly nodose where crossed by the spiral cords ; there are 

 twenty-four axial ribs and about nine spiral cords of equal 

 prominence on the penultimate whorl ; the interspaces between 

 the spiral lines usually carrying small intercalary threads ; 

 suture very distinct, channeled; body-whorl large with a 

 broadly angulated base; aperture broadly ehiptical; outer lip 

 lirate within ; inner lip incrusted ; columella short, twisted ; canal 

 very short and broad, slightly curved. 



Dimensions : — Altitude of the type, apex defective, 18 mm. ; 

 diameter of the last whorl, 9 mm. 



