426 smithsonian miscellaneous collections [vol. 50 



New Eocene (Tejon Formation) Species and Varieties 



TURRITELLA (MARTINEZENSIS Gabb, var. ?) LOMPOCENSIS, 



new variety 



PI. LI, %s. 5a, $b, and 8. 



Description. — Shell averaging about 80 millimeters in altitude, 

 turreted, slender; apex acute. Whorls 10 or more, angulated near 

 base, upper portion flat or slightly convex, lower concave. Suture 

 appressed, not very distinct. Sculpture consists of a prominent 

 raised revolving line on angle, another equally as important at the 

 anterior margin and 3 others of varying degrees of importance above 

 the angle ; between these 5 principal lines there are sometimes inter- 

 calaries. the type showing a persistent one between the angle and 

 the next line above; fine sharp incremental lines, some more impor- 

 tant than others, cross the whorls, bowing convexly backward, this 

 system of sculpture associated with the spiral lines, often giving the 

 surface a cancellate appearance; the interspaces between the major 

 spiral lines are of approximately the same width except in the case 

 of the ones between the second and third lines above the angle, and 

 between the third line above the angle and the suture, both of which 

 are about two-thirds the width of the major interspaces. 



Dimensions. — Altitude of type, from which four or five upper 

 whorls are gone, 68 mm. ; latitude, 20 mm. 



Notes.— This variety is much slenderer than the typical form, and 

 has the angle relatively nearer the base. Named for the town of 

 Lompoc, near the type locality. 



Type.— Cat. No. 165,316, U. S. N. M. 



Locality. — Float boulder, sharp turn in road in San Miguelito 

 Canyon, 4^2 miles southwest of Lompoc, Santa Barbara County* 

 Cal. ; locality No. 4509. 



Horizon. — Tejon formation, Eocene 



PECTEN (CHLAMYS ?) YNEZIANA, new species 



PI. L, fig. 4, and PI. LI, figs. 6a and 6/' 



Description. — Shell averaging 60 to 70 millimeters in altitude; 

 slightly higher than long, moderately convex, practically equivalve 

 and equilateral, rather thin ; base regularly rounded ; dorsal margins 

 concave ; margins somewhat serrate. Surface of disk onamented by 

 from 30 to 45 irregular, inequidistant rounded, more or less imbri- 

 cated ribs ; in some instances the ribs occur quite regularly, every 

 alternate one being prominent, with lesser ones (appearing as inter- 



