1922] Packard: New Species from Santa Ana Mountains 429 



Family Naticidae 

 Genus AMAUROPSIS Morch 

 AMAUEOPSIS PSEUDOALVEATA, n. sp. 

 Plate 35, figures la, lb, and 3 



Type specimen 12301, Coll. Invert. Palae., Univ. Calif., loc. 2151. 



Shell with seven whorls, spire distinctly tabulated, the sides of each spire- 

 whorl flat, except for a shallow groove at the top of the whorl; sutures slightly 

 impressed, the tabulae in some specimens are depressed dorsally and ornamented 

 by several faint revolving ribs; body whorl large, globose, prominently tabu- 

 lated, below which is a conspicuous shallow groove; aperture semicircular, outer 

 lip apparently thin, inner lip with a callus that completely covers the umbilical 

 region; surface of the type smooth except for very fine growth lines. Height 

 of type, 23 mm.; diameter of body whorl, 20 mm.; length of aperture, 17 mm. 



This species is undoubtedly the same as that obtained at Tuscan 

 Springs, California, and figured under the name of the Eocene species 

 A. alveata Gabb. It differs from Gabb's Eocene form in being imper- 

 forate and having a less expanded aperture. 



The type apparently represents an individual of about two-thirds 

 the maximum size of the species. No specimens have been found that 

 equal those described by Gabb as Euspira tabulata in size, although 

 this new species resembles it somewhat in form. 



Horizon. — Chico group, all three zones. 



Genus GYRODES Conrad 

 GYEODES CAL1POENICA, n. sp. 

 Plate 35, figures 2a and 2b 



Type specimen 12300, Coll. Invert. Palae., Univ. Calif., loc. 2167. 



Shell medium size, nearly as high as broad, spire low, consisting of three 

 whorls, which are depressed, rounded without groove or tabulation; suture 

 appressed; aperture subcircular, broadly rounded below and angulated above; 

 umbilicus very small; surface sculptured by irregular lines of growth. Height 

 of type, about 17 mm.; diameter of body whorl, 19.5 mm. 



This species differs from O. canadensis Whiteaves in the lack of 

 tabulation of the last two whorls, and from O. compressus Waring by 

 the lack of a constriction below the suture. 



Horizon. — Chico group, Turritella pescaderoensis zone. 



