352 l>R(KKKl>L\<iS OF THE NATWXAL MUSEUM. 



chink, and by twent}'^ impressed spiral lines which here arc almost as 

 wide as the spaces between them. Aperture suboval. outer lip thin, 

 showing the external sculpture within; columella slender, curved, and 

 reflected, with a moderately strong, oblicjue fold at its insertion; pari- 

 etal wall covered l)y a moderately thick callus which gives the peristome 

 an iilmost continuous appearance. 



The type and another specimen ))elong to the Pa?tel collection and 

 come from Upolu, one of the Samoan Islands. The t3'pe has seven 

 post-miclcar whorls and measures: long. 3.7 nun.; diam. 1.5 nnii. It 

 diti'ers from (). (P.) d(//tsrco.sfat<f Garrett in being more slender, having 

 the whorls less inflated and I'ounded {<hn><ecoi<tata has them decidedly 

 rounded) and in having a greater immber of axial ribs. 



ODOSTOMIA (PYRGULINA) ALVEATA A. Adams. 

 J^late XXII, tig. 5. 

 CliriiKfiUida (ilreata A. Ada.ms, Ann. Mag. Nat. Hist., VII, 18H1, j). 45. 



Shell small, oblong, ovate, milk-white. Nuclear whorls decollated. 

 Post-nuclear whorls rather high between the sutures, moderately 

 rounded, strongly shouldered at the summit, which is subtabulated, 

 crossed b}' strong, roiuided, almost vertical axial ribs, which render the 

 sununit of the whorls crenulate. P^ighteen of these ribs occur upon the 

 third, and nineteen upon the penultimate whorl. Intercostal spaces 

 about one-half as wide as the ribs, crossed by about twelve fine, sub- 

 equally spaced, incised spiral lines. The suuunits of succeeding whorls 

 fall a little anterior to the somewhat angulated periphery of the preced- 

 ing whorl on the earlier volutions, and gives them a somewhat con- 

 stricted appearance at the deep sutures. Peripher}- of the last whorl 

 very faintlv angulated. Base well rounded, somewhat pinched at the 

 umbilical region, marked by the strong contimiations of the axial 

 ribs, and about ten spirally incised lines in the spaces between them. 

 Aperture oval, posterior angle obtuse, outer lip thick (fractured) 

 showing seven eciually well-developed and eciually spaced internal lira- 

 tions; columella short, decidedly curved and re volute, with a strong 

 obli(iue fold at its insertion; parietal wall coxered by a thin callus. 



The specimen described and figured belongs to the Pastel collection 

 and comes from Japan. It has five post-nuclear whorls, and measures: 

 long. '2. mm. ; diam. 1. 1 mm. It is badly worn, which prevents making 

 an accurate coiuit of the incised spiral lines; tiierc are, however, prol)- 

 abl}' twenty- between the suture and the summit on the penultimate 

 whorl and perhaps a similar number on the base. Adams in his 

 description does not mention the internal lirations of the outer lip, 

 but these are usually deep-seated, or appear at intervals, and may not 

 have been a])parent in th-^ specimen originally descri])ed. 



