ART. 20 ADDITIONAL MOLLUSKS FROM ECUADOE BARTSCH 3 



space between the third and the base show the ribs as slender raised 

 threads. Of these ribs, 20 occur upon the second and third of the 

 remaining turns, 21 upon the fourth, 24 upon the fifth, 28 upon the 

 sixth, and 34 upon the last turn. Periphery of the last whorl marked 

 b}'^ a strong spiral cord a little stronger than the first supraperipheral 

 cord. Base moderately rounded, marked by two strong spiral cords 

 which divide the space between the peripheral cord and the tip of 

 the columella into three equal spaces ; these broad spaces between the 

 spiral cords are crossed by slender, threadlike continuations of the 

 axial ribs. Aperture rendered irregular by the strong spiral cords. 

 Outer lip thin, showing the external sculpture within, provided with 

 three slender spiral folds of which the first is between the median 

 and the third, and the second between the third and peripheral cord 

 on the spire, while the third is between the peripheral and first basal 

 cord. Columella very stout, provided with three folds of which the 

 first, which is a little anterior to the insertion of the columella, is 

 very strong and continues over the base as the anterior basal fold, 

 while the other two are slender and much more oblique and rather 

 closely approximated, and almost extend to the anterior terminal 

 point of the columella. 



The unique type (Cat. No. 363066, U.S.N.M.) has seven whorls re- 

 maining, which measure, length, 5 mm. ; diameter, 1.6 mm. 



PYRAMmELLA (SYRNOLA) COLLEA, new specks 



Plate 3, fig. 7 



Shell small, very irregularly elongate-conic, bluish-white, semi- 

 translucent. Earl}'^ whorls decollated, the four remaining almost 

 flattened, appressed at the summit, marked by incremental lines only. 

 Suture scarcely impressed. The preceding whorl shines through the 

 appressed summit, and the anterior termination of the preceding- 

 whorl forms a zone that gives to the shell a false suture effect. 

 Periphery of the last Avhorl well rounded. Base short, well rounded, 

 smooth. Aperture small, oval; posterior angle acute; the outer lij) 

 thickened at the posterior angle and also at the base and slightly so 

 in the middle, forming therefore a rather conspicuous peristome re- 

 inforced within by three strong lamellar folds; inner lip stout, re- 

 flected over and appressed to the base; parietal Avail covered by a 

 moderately thick callus. 



The type (Cat. No. 363095 U.S.N.M.) has lost the nucleus and 

 early postnuclear whorls. The four and one-half remaining meas- 

 ure, length, 3.4 mm. ; diameter, 1.2 mm. This species strongly sug- 

 gests a Melanella^ and would be classified as such were it not for the 

 presence of the spiral lamellae within the outer lip. It will be in- 

 teresting to see the nuclear turns of this species. 



