108 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



The following specimens have been examined : 



TURBONILLA (PYRGISCUS) CINCTELLA Morch. 



Plate 10, figs. 2, 2«, 2b. 

 Turhonilln dnctella Morch, Malak. Bliltt., vol. 6, 1859, p. 119. 



Shell broadly elongate-conic, milk-white, with a faint broad 

 yellowish band on the middle of the space between the sutures, a 

 second narrow one at the periphery, a tliird at the insertion of the 

 columella. Nuclear whorls two and one-half, forming a depressed 

 helicoid spire, whose axis is at right angles to that of the succeeding 

 turns, in the first of which it is about one-third immersed. Post- 

 nuclear whorls extremely regular, well rounded, appressed at the 

 summit, somewhat contracted at the suture, marked by slender, 

 somewhat sinuous, almost vertical axial ribs, of which 20 occur upon 

 the first and second, 22 upon the third, 24 upon the fourth and fifth, 

 and 26 upon the remaining turns. Intercostal spaces twice as wide 

 as the ribs, marked by a series of moderately strong pits at the periph- 

 ery and a second about half as broad, a httle posterior to the middle 

 of the whorls. In addition to these pits the intercostal spaces are 

 marked by 28 slender, ecpially spaced and equally strong, incised 

 spiral Unes, 16 of which occur between the peripher}?^ and the median 

 pit, and 12 between this and the summit. Sutures well impressed. 

 Periphery and base of the last whorl well rounded, the latter marked 

 by the continuation of the axial ribs, which extend feebly to the 

 umbilical area, and slender spiral striations, which are stronger and 

 more distantly spaced than those on tlie spire, growing successively 

 weaker from the periphery to the columella. Aperture oval ; posterior 

 angle acute; out hp thin, showing the external markings within; 

 columella almost straight, slightly revolute. 



The type which has served us for our description and figure has 

 nine post-nuclear whorls and measures: Length 5 mm. diameter 

 1.6 mm. It was collected by Dr. A. S. Oersted at Sonsonate, Guate- 

 mala, and is in the museum in Copenhagen, Denmark. 



TURBONILLA (PYRGISCUS) ADUSTA, new species. 

 Plate 10, figs. 12, 12a. 



Shell robust, pale brown. (Nuclear whorls decollated.) Post- 

 nuclear whorls flattened, shghtly exerted at the summit, where they 

 are moderately squarely shouldered, marked by well developed. 



