8 PROCEEDIlSrGS 01? THE NATIONAL MUSEUM vol. 69 



by seven equal and equally spaced impressed spiral lines. Suture 

 moderatel}^ constricted. Periphery of the last whorl well rounded. 

 Base moderately long, well rounded, marked by incremental lines 

 and 10 incised spiral lines, of which the first 3 below the periphery 

 are rather strongly impressed pits, while the rest are much weaker. 

 The first two, that is, the fifth and sixth below the periphery, are 

 closely approximated, while the next three are about twice as far 

 apart as the other two just mentioned. The next pair inclose a 

 space a little narrower than that posterior to it, while the space be- 

 tween the eighth and ninth is about as wide. Aperture small, oval ; 

 posterior angle acute; outer lip thin showing the external sculpture 

 within; inner lip rather stout, somewhat twisted, reflected over and 

 its posterior half appressed to the base, parietal wall covered by a 

 rather thick callus. 



The type (Cat. No. 363076, U.S.N.M.) measures, length, 6.8 mm.; 

 diameter, 2 mm. 



TURBONILLA (PYRGISCUS) COLLEA, new species 



folate 1, fig. 4 



Shell of medium size, pale horn-colored, with the anterior half of 

 the base pale brown. Nuclear whorls decollated. Postnuclear 

 whorls appressed at the summit, flattened in the middle, and marked 

 by strong, retractively slanting, somewhat curved axial ribs, of which 

 18 occur upon the first and second, 16 upon the third and fourth, 18 

 upon the fifth to seventh, and 24 upon the la&t turn. The spaces 

 separating these ribs are at least twice as wide as the ribs on all 

 but the last turn, where they become much narrower and about equal 

 the ribs in width. Intercostal spaces are crossed by six strong, rather 

 broad equally incised spiral lines, of which the first and second below 

 the summit are much wider apart than the rest; the spaces between 

 the second and third and third and fourth are about equal, while the 

 spaces separating the fourth from the fifth and fifth from the sixth 

 are about equal and about half as wide as the last two. Suture well 

 impressed. Periphery of the last whorl well rounded. Base moder- 

 ately long, strongly rounded, marked by the feeble continuations 

 of the axial ribs and eight equal and equally spaced, rather broad 

 spiral striations which are, however, less strong than those on the 

 spire. Aperture small, oval; posterior angle acute; outer lip thin 

 showing the external sculpture within; inner lip somewhat sinuous, 

 provided with a strong oblique fold at its insertion and reflected and 

 appressed to the base for about half of its length ; parietal wall cov- 

 ered by a rather stronc: callus. 



