658 PROCEEDINGS OF THE XATIOXAL MUSEUM. vol.52. 



distant from the second. Of these lines the first and second are the 

 weakest, while the fourth and ninth are the strongest, the rest being 

 intermediate. In addition to this sculpture there are many fine in- 

 cremental lines and equally fine spiral striations on the spire which 

 give the surface a fine clothlike texture. Suture well impressed. 

 Periphery of the last whorl well rounded. Base short, strongly 

 rounded, marked by the feeble continuations of the axial ribs, which 

 become evanescent before reaching its middle, and eight almost equal 

 and equally spaced incised spiral lines. Aperture broadly oval; 

 posterior angle acute; outer lip thin, showing the external sculpture 

 within; inner lip almost straight, oblique, somewhat revolute, and 

 provided with a strong fold a little anterior to its insertion ; parietal 

 wall covered with a thick callus. 



The type and four additional specimens, Cat. No. 267722a, 

 U.S.N.M., were dredged in shallow water in Santa Maria Bay, Lower 

 California. The type has 9| postnuclear whorls and measures — 

 length, 6,1 mm. ; diameter, 1.7 mm. Cat. No. 268730, U.S.N.M., con- 

 tains another specimen dredged by the U. S. Bureau of Fislieries 

 steamer Albatross at station 5678 off Eedondo Point, Magdalena Bay, 

 Lower California. 



TURBONILLA (PYRGISCUS) BAEGERTI, new species. 



Plate 45, fig. 2. 



Shell elongate conic, light yellow horn colored. Nuclear whorls 

 2^, well rounded, forming a decidedly depressed helicoid spire, 

 the axis of which is at right angles to that of the succeeding 

 whorls, in the first of which the tilted edge of the nucleus is about 

 one-fifth immersed. Postnuclear whorls flattened, slopingly shoul- 

 dred toward the summit, marked by distinctly spaced, well-rounded, 

 XQYj regular, slightly retractively slanting axial ribs of which 18 

 occur upon the first five and 20 upon the remaining turns. These ribs 

 become decidedly enfeebled and somewhat flattened toward the sum- 

 mit. Intercostal spaces about twice as wide as the ribs crossed by 

 12 incised spiral lines of which the first to fourth, and the sixth, 

 ninth, and tenth are mere striations while the fifth, seventh, eighth, 

 eleventh, and twelfth are subequal and much stronger. The widest 

 space is between the tenth and eleventh line, the rest of the spacing 

 is subequal, excepting the first four lines below the summit, which are 

 a little more closely crowded. Suture strongly constricted. Periph- 

 ery of the last whorl well rounded. Base short, well roimded, marked 

 by the feeble continuation of the axial ribs which become evanescent 

 before reaching the middle of the base and 16 rather closely crowded 

 finely incised spiral lines, the first of which is considerably anterior 

 to the first series of supraperipheral pits. Aperture large, broadly 



