672 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



It was collected in the Eocene Tejon formation at the University 

 of California locality 672, SE. i of NW. i sec. 24, Parson's Peak, 

 in Tejon white sandstone, to 10 feet below white shale. 



CERITHIOPSIS OREGONENSIS Dickerson. 



Cerithiopsis oregonensis Dickekson, Proc, Cal. Acad. Sci., ser. 4, vol. 4, 1914, 

 p. 121, pi. 11, figs. 5, 5a. 

 The type of this species. No. 246, California Academy of Sciences, 

 comes from the Eocene, locality 25, Eoseburg Quadrangle, Oregon, 

 near the center of sec. 19, T. 26 S., R. 3 W., on the east bank of Little 

 Eiver at its confluence with the Umpqua, underneath the bridge at 

 that point. It measures— length, 20 mm. ; diameter, 4.5 mm. 



CERITHIOPSIS BOLINGERENSIS Clark. 



Cerithiopsis boUngerensis Clark, Bull. Dept. Geol. Univ. Cal., vol. 8, 1915, 

 pp. 490, 491, pi. 65, fig. 25. 

 This species comes from the Miocene Upper San Pablo of Las 

 Trampas Ridge, University of California locality 1182. It is said 

 to have seven or eight whorls and measures about 8 mm. in length. 



CERIXmOPSIS TURNERI Clark. 



Cerithiopsis turneri Clark, Bull. Dept. Geol. Uuiv. Cal., vol. 8, 1915, p. 490, 

 pi. 65, figs. 1, 2. 

 This specimen comes from the Miocene, in the Lower San Pablo 

 group at Kirker Pass, University of California locality 100. 



The type is said to have 10 to 11 whorls and measures — length, 

 about 15 mm. ; diameter, 4 mm. 



BITTIUM BARTOLOMENSIS, new specieg. 



Plate 47, fig. 5. 



Shell stout, very broadly conic, with deeply channeled suture, the 

 posterior half between the summit and suture of each whorl and the 

 posterior half of the base brown, the rest white. Nuclear whorls 

 decollated. Postnuclear turns marked by broad, rounded axial ribs, 

 of which 16 occur upon the second to fifth, 18 upon the sixth, and 20 

 upon the last turn. These ribs extend strongly from the rather 

 prominent shoulder at the summit to the suture. The spiral sculp- 

 ture consists of four equally strong and equally spaced cords, which 

 are about as wide as the spaces that separate them. On the last two 

 turns a slender intercalated spiral thread appears between the 

 second and third and the third and fourth cords. The junction of the 

 axial ribs and spiral cords form quite strong well-rounded tubercles, 

 while the spaces inclosed by them are rather deep concave pits except 

 Avhere they are divided by the intercalated threads. Suture strongly 



