312 University of California Publications in Geology [Vol. 10 



at angulation. Body whorl with well-marked groove at about middle 

 of distance between angulation and end of canal ; ornamented on the 

 sides by about eight to ten distinct, subequal, spiral ridges which be- 

 come almost obsolete immediately below the angulation ; axial varices 

 extend across groove down about one-half of length of canal. Aper- 

 ture ovate ; outer lip thin ; with long, rather wide, recurved canal. 

 Dimensions : Maximum diameter, 26 mm. ; height unknown. 



This species is apparently closely related to Trophon coalingensis 

 Arnold. It may readily be distinguished from that form, however, 

 by having a higher spire, longer canal, and less number of axial 

 varices. From such forms as Trophon stuarti Smith and Trophon 

 gracilic Perry, it differs among other characteristics in having the 

 deep groove at lower part of body whorl. 



Occurrence. — Rare in the upper Santa Margarita, northeast of 

 Coalinga ; Nacimiento River eight miles west of San Miguel, San Luis 

 Obispo County ; Vineyard Creek anticline, Monterey County. 



TURRITELLA FREYA, n. sp. 

 Plate 19, figure 2 



Type an imperfect specimen, no. 11313, from locality 2283, near SW corner 

 of NW % sec. 15, T. 19 S, R. 15 E, M. D. B. & M., Coalinga quadrangle. 



Shell tapering rapidly, number of whorls unknown ; with dis- 

 tinct, slightly impressed suture. Whorls flat with a wide ridge near 

 middle ; immediately above the suture are two prominent spiral 

 cords with interspaces of about the same width ; between the middle 

 ridge and suture above, a slight tendency to depression is noticeable ; 

 ridges and interspaces covered by numerous, on the type twenty-five, 

 narrow spiral striations ; incremental lines indistinct. Aperture sub- 

 circular to nearly square. Dimensions : Maximum diameter, 16 mm. ; 

 height unknown. 



Occurrence. — At locality 2283, northeast of Coalinga, near middle 

 of Santa Margarita; locality 1697, about one-half mile north of town 

 of Santa Margarita, in type section of the Santa Margarita. 



TURRITELLA MARGARITANA, n. sp. 

 Plate 20, figure 5 



Type specimen, no. 11312, in Univ. Calif. Coll. Invert. Palae., from locality 

 1706 at approximately middle of southern boundary of sec. 17, T. 29 S, R. 13 

 E, M. D. B. & M. ; elevation about 1200 feet. San Luis quadrangle. 



Shell medium in size ; number of whorls unknown ; sides of whorls 

 approximately flat ; suture distinctly impressed. Near the base are 



