638 FROCEEDING8 OF THE NATIONAL MUHEUM. vol.52. 



posterior to the sulcus. The space between the peripheral angle and 

 the channeled summit forms a decided groove that separates the 

 whorls. Base short, well rounded. The entire surface of the shell 

 is marked by fine incremental lines and well-marked spiral striations. 

 Aperture moderately large, oval; posterior angle acute; outer lip 

 evenly curved; innei- lip strong, straight, revolute, provided with 

 three folds, of which the posterior is very strong, lamellar and par- 

 allelly disposed to the peripheral sidcus; the other two folds are less 

 strong and much more oblique. 



The specimen described and figured, Cat. No. 194405, U.S.N.M., 

 was collected by Mr. George H. Eldridge in the lower Miocene bluffs 

 of Kern River, 1 mile below the power developing station, on the 

 north side of the river at Bakersfield, California; it consists of the 

 last three whorls, and measures — length 6 mm., diameter 3.6 mm. 



PYRAMIDELLA (LONGCHAEUS?) PACKI Dickerson. 



Odostomia pacJxi Dickerson, BuU. Dept. Geol. Uuiv. Cala., vol. 9, No. 17, 

 1916, p. 498, pi. 37, fig. 2. 



The type, an incomplete specimen of 12 whorls, measures — length 

 10 mm., diameter 3.5 mm. It was collected in the Eocene, Tejon 

 formation, at University of California locality 2226, Rose Canyon, 

 San Diego Count3^ California. 



Of this the author states that the inner lip is marked by two plaits 

 " which is characteristic of this genus." Odostomia never has more 

 than one plait. The figure shoAvs a Pyramidella with basal portion 

 of the aperture lost, which is probably responsible for the absence of 

 the third fold characterizing the subgenus Longchaeus^ to which I 

 believe the shell belongs, 



PFRAMIDELLA (PHARCIDELLA) MAGDALENENSIS, new species. 



Plate 42, fig. 1. 



Shell elongate conic, very pale horn yellow; nuclear whorls two, 

 well rounded, forming a depressed helicoid spire, the axis of which 

 is at right angles to that of the succeeding turns, in the first of which 

 it is about one-third immersed. Post-nuclear whorls flattened, nar- 

 rowly shouldered at the summit with a deep spiral groove at the 

 periphery which shoAvs in the suture of all the turns and gives this the 

 appearance of being deeply channeled. Summit of whorls strongly 

 crenulated, the weak depressions on the sides of the crenulation pass- 

 ing down the sides of whorls for a short distance below the summit ; 

 the rest of the surface being marked by fine lines of growth and ex- 

 ceedingly fine spiral striations. The deep peripheral sulcus is crossed 

 by slender axial riblets, which are more slender and more numerous 



