16 PROCEEDINGS OF THE I^ATIONAL MUSEUM vol.69 



two are almost flattened, while the later turns are again slightly 

 roimded, summit of the whorls very narrowly shouldered. ^The 

 whorls are marked by moderately strong very regular protractively 

 slantmg axial ribs, of which 20 occur upon the second and 22 upon 

 the remaining turns. The intercostal spaces are about one and one-half 

 times as wide as the ribs and crossed by five equal and equally spaced 

 spiral cords, of which the first is at the summit. The spaces inclosed 

 between the ribs and spiral cords form almost squarish pits, while 

 their junction form slender rounded tubercles. On the last two turns 

 the peripheral smooth cord is apparent in the suture. The axial 

 ribs extend across the space separating the peripheral cord from the 

 first supraperipheral cord, but scarcely render it tuberculated. Base 

 rather long, somewhat inflated, well rounded, marked by five -low 

 rounded spiral cords which are not quite as wide as the spaces that 

 separate them. The first of these is the peripheral cord referred to. 

 These cords grow progressively weaker from the peripheral cord 

 anteriorly and the spaces separating them become a little narrower. 

 Aperture oval; posterior angle acute; outer lip thin showing the 

 external sculpture v>dthin ; inner lip almost straight, reflected over 

 and appressed to the base, but leaving a very narrow umbilical chink, 

 and provided with a very strong oblique fold at its insertion ; parie- 

 tal wall covered with a thick callus. 



The type (Cat. No. 363093, U.S.N.M.) has five postnuclear 

 whorls and measures, length, 2.1 mm. ; diameter, 0.8 mm. 



ODOSTOMIA (PYRGULINA) MAKA, new species 



Plate 2, fig. 9 



Shell small, very elongate-ovate, bluish-white. Nuclear whorls 

 decollated. Postnuclear whorls slightly rounded, narrowly shoul- 

 dered at the summit, and crossed by 14 distantly spaced lamellar 

 axial ribs. The spaces separating the ribs are about five times as 

 wide as the ribs and are crossed by five equal and almost equally 

 spaced incised spiral lines. Suture rendered wavy by the strong 

 axial ribs at the summit. Base short, strongly rounded, marked by 

 five equally incised spiral lines which are almost as strong as those 

 on the spire. The first of these is about one-third of the distance 

 between the first supraperipheral line and the tip of the base anterior 

 to the supraperipheral line, thus leaving a broad smooth zone on the 

 posterior portion of the base. The rest of the lines are progressively 

 a little closer spaced from the posterior anteriorly. Aperture small, 

 oval; posterior angle obtuse; outer lip thin showing the external 

 sculpture within; inner lip short, very heavily reflected over and 

 appressed to the base for a little more than half its length, and pro- 

 vided with a rather strong oblique fold at its insertion ; parietal wall 



