1922] Trash: The Briones Formation of Middle California 155 



Family Buccinidae 

 Genus SIPHONALIA Adams 

 SIPHONALIA EODEOENSIS, n. sp. 

 Plate 7, figures 4a and 4& 

 Type.— No. 12389, Univ. Calif. Mus. Pal. 



Shell fusiform; spire of medium height; sutures moderately appressed; whorls 

 subangulate above the middle and slope gently up to the suture; surface of 

 whorls with about ten longitudinal ridges, which are more pronounced upon the 

 spiral whorls, and are more prominent at the point of angulation of the whorls; 

 shell sculptured with numerous spiral ribs, which tend to become obsolete on 

 the body whorl; on the whorls of the spire there are three major revolving ribs 

 alternating with two minor ribs; inner lip smooth; canal medium in length and 

 gently reflexed; umbilicus subperf orate. 



Dimensions. — Type specimen U. C. no. 12389; alt., 30.5 mm.; greatest width, 

 17.8 mm.; alt. of aperture, 21.5 mm. 



Occurrence. — Briones formation. Type from TJ. C. loc. no. 1177, on the north 

 side of Eodeo Creek. 



This species resembles S. danvillensis Clark, 30 found in the Upper 

 San Pablo, but it differs from the latter in that the angulation on the 

 whorls, particularly on those of the spire, is not so pronounced ; the 

 surface of the whorls above the point of angulation slopes upward 

 toward the suture and is not depressed as in S. danvillensis ; there are 

 no spiral ribs above the angulation; and there is a pronounced alter- 

 nating arrangement in size of the revolving ribs on the spiral whorls. 



Family Muricidab 

 Genus TROPHON Montfort 

 TEOPHON DAVIESI, n. sp. 

 Plate 7, figures 5a and 5b 

 Type.— No. 12391, Univ. Calif. Mus. Pal. 



Shell medium in size; spire about one-third height of shell; suture slightly 

 appressed; body whorls five, with a flat, somewhat upward sloping tabulation; 

 body whorl large, with depression about midway from angulation to base of 

 whorl; outer lip not preserved; inner lip incrusted; canal moderately long and 

 recurved; umbilicus subperf orate. 



Dimensions. — Type specimen U. C. no. 12391; alt., 42 mm.; greatest width, 

 29 mm.; alt. of aperture, 28 mm. 



Occurrence. — Briones formation. Type from U. C. loc no. 1354. 



Named in honor of my mother, Kate Davies Trask and my uncle, Dr. M. J. 

 Davies. 



so Clark, Univ. Calif. Publ. Bull. Dept. Geol., vol. 8, p. 497, pi. 67, fig. 6, 1915. 



