500 University of California Publications in Geology [Vol. 9 



set spiral lines, both above and below, adjacent to the linear im- 

 pressed suture The decoration of the body-whorl consists of a 

 nodose spiral line at the shoulder ; twelve to fifteen spiral lines are 

 found below the shoulder, minor threads occurring between these 

 lines. 



This species is distinguished from T. monolifera (Cooper) by 

 its greater number of nodes and by greater spire length. 



Named in honor of Mr. Chester Stock, graduate student, Uni- 

 versity of California. 



Dimensions. — Length, 14 mm. ; width of body-whorl, 4.5 mm. 



Occurrence. — University of California Locality 672. 



TURRITELLA BUWALDANA, n. sp. 

 Plate 42, figures 7a, 7b 



Shell slender, elongate ; whorls fourteen or fifteen ; each flat-sided 

 whorl carinated near base, diminishing in diameter toward the apex. 

 Sculpture consists of two small spiral threads just above a linear 

 suture, then four strong spiral lines with an intercalary thread 

 and two threads close together on apex. The differences in these 

 lines are more emphasized in the younger specimens and in the 

 lower whorls of older specimens. The two small threads just above 

 and the two just below the suture of the last whorls of a large speci- 

 men are absent, the intercalary threads are much stronger than in 

 the upper whorls and the four principal ribs are practically equal 

 in strength. Spiral lines alternating in size decorate the base of 

 the body-whorl. Sinuous lines of growth cross the spiral lines. 



This species has a flat-sided whorl while T. uvascma Conrad has 

 a convex whorl. The major spiral ribs of T. uvasana Conrad are 

 equally accentuated and evenly spaced while on T. buwaldana, n. 

 sp. they vary in strength. 



The younger whorls of this species resemble those of T. mer- 

 riami Dickerson closely but the development of the later whorls in 

 the two cases is opposite. The principal carina on T. merriami be- 

 comes more and more pronounced while the reverse is true with the 

 species described above. This species has also been found at the 

 type locality of the Tejon group on the Canada de las Uvas. It is 

 very close to a Turritella described by Arnold as Turritella mar- 

 tinezensis (?) var. lompocensis. This form is really a species and 

 not a variety. The principal differences appear to be as follows : 

 T. lompocensis has a slightly concave whorl while T. buwaldcma is 



