6 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 69 



periphery; they are crossed by numerous very fine closely spaced 

 spiral striations. Suture rendered rather conspicuous by the shoul- 

 dered summit. Base rather short, well rounded, marked by in- 

 cremental lines and closely spaced microscopic spiral striations. 

 Aperture subquadrate ; outer lip thin showing the external sculpture 

 within; inner lip almost straight and almost vertical; parietal wall 

 covered by a thin callus. 



The type (Cat. No. 363071, U.S.N.M.) has 8.8 whorls and meas- 

 ures, length, 5.2 mm. ; diameter, 1.3 m.m. 



TURBONILLA (STRIOTURBONILLA) CAPA, new species 



Plate 1, figs. 1, 2 



Shell elongate-conic, bluish- white. Nuclear whorls 214, "well 

 rounded, forming a depressed helicoid spire, the axis of which is 

 about one-third immersed in the first of the postnuclear turns. The 

 left outline of the nuclear spire projects slightly beyond the outline 

 of the postnuclear spire. Early postnuclear whorls well rounded, the 

 later ones only slightly rounded, marked by rather strong slightly 

 protractively slanting, quite regular axial ribs, of which 18 occur 

 upon the first 4 whorls, 20 upon the fifth and sixth, 22 upon the 

 seventh, 24 upon the eighth, 26 upon the ninth, and 28 upon the 

 last turn. The intercostal spaces are about as wide as the axial 

 ribs, terminating anteriorly in a deep pit. Another deep pit of less 

 size is situated about two-fifths of the distance between the summit 

 and the peripheral pit anterior to the summit. The space between 

 the peripheral and median pit is crossed by 14 almost equal and 

 almost equally spaced spiral striations, while the space between the 

 summit and the median pit has 13 spiral striations. These are a 

 little finer than those on the anterior portion. Suture well im- 

 pressed, periphery well rounded. Base short, well rounded, marked 

 by about 15 well impressed spiral striations which are a little more 

 distantly spaced than those posterior to the periphery. Aperture 

 subquadrate, the posterior angle obtuse; outer lip thin showing the 

 external sculpture within; inner lip stout, reflected over and ap- 

 pressed to the base for its posterior third. 



The description of the species has been based upon two specimens 

 (Cat. No. 363072, U.S.N.M.). One having the nuclear spire and 

 seven whorls measures; length, 3.3 mm.; greater diameter, 1 mm. 

 The other has the last five whorls and measures, length, 4.6 mm.; 

 greater diameter, 1.6 mm. Between the two there is an overlap of 

 probably one whorl. 



Cat. No. 363073, U.S.N.M., contains another specimen from the 

 same locality. 



