498 University of California Publications in Geology [Vol. 9 



ODOSTOMIA PACKI, n. sp. 

 Plate 37, figure 11 

 Shell small, elongate, slender, with at least twelve whorls ; spire 

 high with acute apex; whorls flat-sided, smooth or ornamented by 

 very fine spiral threads, suture distinct, linear, channeled ; aperture 

 round ; outer lip marked by an internal spiral rib ; inner lip by two 

 plaits, which are characteristic of this genus. 



Named in honor of Robert W. Pack, Palaeontologist, U. S. Geolog- 

 ical Survey. 



Dimensions. — Length of broken type, 10 mm. ; width of body- 

 whorl, 3.5 mm. 



Occurrence. — The type is from University of California Locality 

 2226, Rose Canon, San Diego County, California. This species also 

 occurs at University of California Locality 1817, lower Tejon beds 

 north of Coalinga, California and at California Academy of Sciences 

 Locality 183, Vader, Lewis County, Washington, in the west bank of 

 the Cowlitz River about one and three-fourths miles southeast of 

 Vader or about one-half mile south of Locality 182. 



STREPSIDURA HOWARDI, n. sp. 

 Plate 37, figure 13 

 Shell robust, medium in size, with twelve prominent, rounded 

 nodes ; number of whorls unknown ; suture wavy ; body -whorl swollen ; 

 strong spiral lines about twenty in number decorating the body- 

 whorl ; mouth semi-oval ; outer lip thin ; inner lip but slightly in- 

 crusted. 



Dimensions. — Length of broken type, 27 mm. ; width of body- 

 whorl, 23 mm. 



Occurrence. — University of California Locality 476. 



SIPHONALIA SUTTERENSIS Dickerson 



Plate 41, figures 5a, 5b, 5c, 5d, 5e 



Siphonalia sutterensis Dickerson, "Fauna of Eocene at Marysville Buttes, 

 California," Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, p. 283, 1913. 



A large series of specimens of this species were collected at Uni- 

 versity of California Locality 2225. The younger specimens are 

 slenderer than the mature forms, the canal is less bent, the spiral 

 ribbing on the body whorl is more conspicuous, and nodes of the body 

 whorl are less marked. A young specimen resembles a form belonging 

 to the genus Nyctilochus. 



