ART. 14. NEW MOLLUSKS FROM ECUADOR BARTSCH. 7 



ing turns. The intercostal spaces are a little wider than the ribs. In 

 addition to the axial sculpture, the whorls are marked by 5 spiral 

 cords of which the first is at the summit, and is a little broader than 

 the rest. These spiral cords are equally spaced. The intersections 

 between them and the axial ribs form low, rounded nodules, while 

 the spaces enclosed between them form slightly elongated pits, the 

 long axis of which coincides with the spiral sculpture. Suture 

 moderately constricted. Periphery of the last whorl marked by a 

 spiral cord similar to those on the spire. Base short, well rounded, 

 marked by 5 spiral cords between the peripheral cord and the inser- 

 tion of the columella, which grow consecutively smaller from the 

 posterior anteriorly, the columella being marked by 3 slender spiral 

 threads. Aperture broadly oval; posterior angle acute; outer lip 

 thin, showing the external sculpture within; inner lip almost straight, 

 reflected over and appressed to the base for almost its entire length, 

 provided with a moderately strong fold a little anterior to its inser- 

 tion. ^ 



The type. Cat. No. 359762, U.S.N.M., has 6.5 postnuclear whorls 

 and measures: length, 3.5 mm.; diameter, 1.2 mm. 



The present species is nearest related to TurboniUa {Bartschella) 

 andreivsi Dall and Bartsch from Panama, from which it differs by 

 its white color, much larger size and more elegant sculpture 



ODOSTOMIA (CHRYSALLIDA) OLSSONI, new species. 



Plate 2, fig. 3. 



Shell elongate-ovate, bluish white. Nuclear whorls decollated in 

 part, the remaining portion deeply immersed in the first of the suc- 

 ceeding turns. Postnuclear whorls strongly, tabulatedly shouldered 

 at the summit, marked by very strong, slightly protractively slant- 

 ing, almost vertical axial ribs, of which 18 occur upon the first, 20 

 upon the second, and 18 upon the remaining turns. Intercostal 

 spaces about one and a half times as wide as the ribs. The spiral 

 sculpture consists of 4 spiral cords which are not as strong as the 

 axial ribs, the first of which is at the summit. These cords divide 

 the space between the summit and the periphery into three equal 

 spiral zones of pits. In the later whorls the summit of the turn 

 drops below the periphery and leaves the peripheral cord in the 

 suture. This is as strong as the spiral cords on the spire. Suture 

 strongly channeled. Base rather long, marked by 5 strong spiral 

 cords, the spaces between which are crossed by numerous fine axial 

 threads. Aperture oval ; posterior angle obtuse ; outer lip fractured ; 

 inner lip stout, reflected over and appressed to the base, and provided 

 with a very strong oblique fold a little anterior to its insertion. 



