430 University of California Publications in Geology [Vol. 13 



Family Cerithiidae 

 Genus CERITHIUM Bruguiere 

 CERITHIUM (?) SUCIAENSIS, n. sp. 

 Plate 35, figure 4 

 Type specimen 12303, Coll. Invert. Palae., Univ. Calif., loc. 2209. 

 The specimen herein described includes only portions of three whorls from 

 the lower part of a very large turretted gastropod. The whorls are markedly 

 restricted at the sutures and slightly flattened midway between them; aper- 

 ture apparently oval; columella smooth, without a sulcus probably imperforate; 

 canal unknown; shell ornamented by about 22 axial ribs, being more prominent 

 near the top and the bottom of the whorl; each rib is deflected backward at 

 the shoulder and joins the suture by a curved line; base of each whorl orna- 

 mented by several indistinct revolving ribs. Height of whorl, 24 mm.; diameter, 

 43 mm. 



Horizon. — Chieo group, zonal position unknown. 



CERITHIUM (?), sp. 



Two specimens, each represented by imperfect, partially deccolated 

 whorls, were obtained at locality 2173 and 2135, Santa Ana Moun- 

 tains. The larger of these has a body whorl having a diameter of 

 30 mm. It was apparently ornamented by two prominent, spiral rows 

 of nodes, each with at least 18 rather conspicuous nodes. The other 

 specimen (2135) may represent the upper whorls of C. (?) suciaensis, 

 but the latter is probably distinct. These are unsuitable for figuring. 



Family Aporrhaidae 

 Genus ALARIA Morris and Lycett 

 ALARIA NODOSA, n. sp. 

 Plate 36, figures 5a and 5b 

 Type specimen 12297, Coll. Invert. Palae., Univ. Calif., loc. 2155. 

 Shell medium sized, spire high, eight whorls; spire whorls tumid, ornamented 

 by about 14 slightly oblique transverse ribs, which do not reach the suture; 

 region just below the suture on each whorl ornamented by several very fine 

 spiral ridges; body whorl large, canal long; outer lip flat, expanded, lower 

 margin slightly concave; upper margin somewhat concave from the bluntly 

 pointed, upward directed projection of the lip. Height of type, 27+ mm. 



This species is apparently represented by a partly deccolated speci- 

 men from locality 2142, which shows the same configuration of the 

 lower margin of the lip, but possesses less pronounced transverse 

 ridges. 



Horizon.- — Chieo group, zonal position unknown. 



