Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 65 



Occurrence : — Miocene of the Oregon coast, five miles north 

 of Yaquina Bay, locaHty 36. 



This species is very similar to the recent and fossil species, 

 Calliostoma costatum Martyn, but can be distinguished from 

 the latter by the fine spiral sculpture on the base. The base of 

 C. costatum \s sculptured the same as the whorls of the spire. 



Type: — No. 134, and cotype No. 133, Cal. Acad. Sci., one- 

 half mile north of Yaquina Head, Lincoln County, Oregon. 



Genus NISO Risso 

 Niso (?) antiselli, new species 



Plate 7, figure 22. 



Shell small, smooth, with six whorls; spire conical, upper 

 whorls absent in the type specimen ; whorls nearly flat, tapering 

 toward the apex, unsculptured ; suture appressed ; body-whorl 

 sharply angulated at the periphery; base convex, with a dis- 

 tinct umbilicus; aperture quadrate; outer lip distinctly angu- 

 lated, angle about 100° ; inner lip thin, smooth; umbilical open- 

 ing large but not extending to the apex of the shell. 



Dimensions: — Altitude, apex broken, 7.5 mm.; latitude of 

 the last whorl, 4 mm. 



Occurrence : — The type specimen was obtained from the 

 lower Miocene of eastern San Luis Obispo County, California, 

 locality 125. 



The living species of this genus are found in tropical and 

 temperate seas. The placing of this species in the genus Niso 

 is somewhat doubtful. The umbilical opening does not extend' 

 to the apex of the shell ; it is, however, much more pronounced 

 than in any of the EulimidcC or Pyramidellidse and has there- 

 fore been classed as a Niso. 



Type: — No. 135, Cal. Acad. Sci., on top of a hill in the 

 southwest corner of the S. E. Va of Sec. 29, T. 28 S., R. 15 E., 

 San Luis Obispo County, California. 



Named in honor of Dr. Thomas Antisell, one of the early 

 geologists of California. 



