NO. 1545. NE I V FOSSIL MOLL USKS FK OM CA LIFORNIA—A RNOLD. 529 



PLEUROTOMA (BATHYTOMA) KEEPI, new species. 

 Plate XLYI, fig. 5. 



Description. — Shell large for the genus Pleurofoina., fusiform; spire 

 about as long as aperture; whorls six, angulated below the middle, 

 sloping coneavel}^ above and about the same below. Surface orna- 

 mented l)v a rim of nodes (ten on the body whorl in the t3^pe) on the 

 angle of the whorl and l)y numerous revolving raised lines or ribs. 

 Aperture narrow, narrowing rapid!}' from top toward l>ottom; inner 

 lip straight, outer lip reflecting angulation of whorls. 



Dimensions. — Longitude (restored), (>0 mm.; latitude, 30 mm. 



Notes. — This species is closely allied to and is doubtless the precur- 

 sor of P. tnjoniana Gabb. It was first thought that the Miocene 

 forms were the same species as the living, ])ut a careful comparison of 

 .specimens shows /*. Irepi to ])e much more abbreviated and with a rela- 

 tively more angulated ])ody whorl than P. tryoniana. The nodes also 

 are somewhat sharper and are more prominently developed on the 

 body whorl in the former. Named in honor of Prof. -losiah Keep, of 

 Mills College, California. 



Type.— C2ii. No. 164993, U.S.N.M. 



Locality. — Head of Topanga Canyon, 3 miles south of Calabasas, 

 Los Angeles County, California. ''G. W. Edmond and Ralph Arnold.) 



Horizon. — Lower Miocene. 



MACRON MERRIAMI, new species. 

 Plate XLI, fig8. 4 and 4«. 



Description. — Shell small, ovate, solid; spire elevated; apex acute; 

 whorls live, evenly convex, nearly smooth, except for a prominent 

 furrow which passes around the bod}" whorl one- third the w^ay up from 

 its base; between this prominent furrow and the umbilicus are three 

 other less prominent grooves. Suture narrow but canal-like; aperture 

 narrow and elliptical. Columella slightly callous posteriorly; anterior 

 portion produced and Hexed; posterior part of lip bent. Canal a mere 

 notch. Umbilicus subperforate. 



Dimensions. — Longitude, 23 mm.; latitude, 13 mm.; body whorl, 

 19 mm.; aperture, 16 mm.; deflection, about 70°. 



Notes. — This characteristic little species is closely allied to and prob- 

 ably is the precursor of 2d. I'eJletti! A. Adams. It differs from the 

 latter, however, in being relativeh" narrower, having a narrower 

 shoidder at the suture and in having one more groove in the basal por- 

 tion of the body whorl. Named in honor of Prof. John C. Merriam, 

 of the University of California, Berkeley. 



Ty2)e.—C^t. No. 164982, U.S.N.M. 



Locality. — Head of Topanga Canyon 3 miles south of Calabasas, Los 

 Angeles County, California. (G. W. Edmond and Ralph Arnold.) 



Horizon. — Lower Miocene. 



