166 University of California Publications in Geology [Vol. 11 



The form referred to Crepidula praerupta from the Agasoma 

 gravidum beds was determined purely on external outline ; the sep- 

 tum of this species is unknown, and it is very possible that two or 

 more species have been listed hy different writers under this name. 



Crepidula praerupta is reported in the Miocene of Coos Bay, 

 Oregon. Conrad's type came from near Astoria and was obtained 

 from either the Oligocene or Miocene of that region. Arnold and 

 Hannibal have reported Crepidula praerupta, from the Oligocene of 

 Vancouver Island and Oregon. They have also reported it from the 

 Lower Miocene of Oregon and Washington. 



CREPIDULA EOSTRALIS Conrad 



Crepidula? Conrad, Geol. IT. S. Expl. Exp., pi. 19, figs. 11a. 116, 1849. 

 Crypta rostralis Conrad, Amer. Jour. Conch., vol. 1, p. 151, 1865. 

 Crepidula rostralis Conrad, Dall, U. S. Geol. Surv., Prof, paper no. 59, 

 p. 83, 1909. 



Family Naticidae 

 Genus NATICA Scopoli 



NATICA (AMPULLINA) GABBI, n. sp. 

 Plate 19, figures 12, 14 and 15 

 Type specimen 11252, Coll. Invert. Palae. Univ. Calif, loe. 1311 



Shell small to medium in size, globose ; spire low ; apex acute ; sutures marked 

 by a distinct impressed line. Number of whorls five; whorls of spire gently 

 convex ; on the body whorl the convexity is the greatest just below the suture, 

 while the sides of the whorl are only gently convex. On some of the specimens, 

 on the body whorl just below the suture there is a fairly well-defined, narrow 

 tabulation ; this appears to be due to weathering. Surface smooth except for 

 fine lines of growth. Base of body whorl rather narrow and strongly produced 

 anteriorly. Aperture semilunate ; inner lip reflexed anteriorly, the reflexed por- 

 tion extending up to and nearly covering the umbilicus; here it is somewhat 

 thicker than anteriorly and might be considered as a part of the callus. On a 

 few specimens, posterior to the umbilicus the base of the body whorl is covered 

 by a thin wash of callus. Umbilicus subperforate. 



Dimensions. — Type specimen: height, 11 mm.; height of body whorl, 9 mm.; 

 maximum width of body whorl, 11 mm. 



Occurrence. — University of California localities 14, 1131, 1311, 1309, etc 

 Type specimen from locality 1131 ; paratype from locality 1309. 



NATICA (EUSPIEA) RAMONENSIS, n. sp. 

 Plate 19, figure 16 

 Type specimen 11257, Coll. Invert. Palae. Univ. Calif., loc. 1131 

 Shell medium in size, subovate ; spire low; body whorl large, a little over 

 three-fourths the height of the shell, subtabulate just below the suture. Num- 

 ber of whorls five, with sides gently convex. Sutures appressed. Surface of 



