Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD IS 



Agasoma yaquinanum, new species 

 Plate 4, figures Sa and 5b 



Shell pyriform, with five or six tabulated whorls ; spire rather 

 low; whorls angulated near the middle, flat above and below 

 giving the shell a beautifully tabulated appearance, sculptured 

 with eleven spiral threads, six above and five below the angle, 

 and a large number of indistinct axial ribs which produce sharp 

 nodulations on the larger spiral threads and especially on the 

 angulatfons ; body-whorl inflated, with a broad tabulation, 

 sculptured with twelve or fourteen major spiral cords between 

 which are three intercalary threads, the middle one of which 

 is slightly larger than those on either side ; the interspaces be- 

 tween these secondary spirals again occupied by very fine in- 

 tercalary lines ; axial ribbing almost obsolete on the body-whorl 

 except on the angulation where they form nodes; suture ap- 

 pressed ; aperture ovate ; lips smooth and simple ; canal moder- 

 ately long and slightly recurved ; columella twisted. 



Dimensions : — Altitude of the type specimen, 25 mm. ; maxi- 

 mum latitude of the shell, 14 mm. 



Type: — No. 161, and cotype No. 162, Cal. Acad. Sci., Mio- 

 cene of the Oregon coast, a little north of the entrance to 

 Yaquina Bay, locality 39. 



Genus NASSA Martini 



Nassa ocoyana, new species 



Plate 7, figure 17. 



Shell small, with about five angulated whorls ; spire elevated ; 

 whorls of the spire nearly flat, tabulated, sculptured with eight 

 or nine broad, rounded axial ribs which are most prominent on 

 the upper portion of the whorl where they produce nodes on the 

 angulation, and seven or eight spiral cords which alternate in 

 size, there being four or five slightly more prominent than those 

 intervening; the axial ribs obsolete on the body-whorl and on 

 the lower portion of the penultimate whorl ; suture wavy, dis- 

 tinct, bounded below by a sutural band; body-whorl nearly 

 flat at the center and marked by a strong spiral groove near the 

 base ; below the groove are three or four strong spiral threads 

 and about eight indistinct spiral ridges between the groove and 



