360 PROCEEDINGS OF THE NA TIONAL MUSEUM. 



Base well rounded, somewhat attenuated anteriorly, sculptured like 

 the spaces between the sutures, having seven spiral keels; these keels 

 diminish somewhat in size from the periphery to the umbilical area. 

 Aperture subovate, posterior angle acute, outer lip thin, wavy, show- 

 ing the external sculpture within, columella decidedly curved, reen- 

 forced anteriorly by the atteiuiated ])ase, provided with a very strong, 

 acute, oblique fold near its insertion; parietal wall covered by a thin 

 callus. 



There are two specimens of this species in the Pastel collection. The 

 one described and figured has five post-nuclear whorls and measures: 

 long. 2.1mm.; diam. 1 nun. This species closely resembles Odo.stotnia 

 {Evalea) lirata A. Adams. It is, however, more compact than that 

 species and has two more spiral keels on the base. O. {E.) Ih'uta is not 

 an Evalea^ but belongs to the subgenus Odetta; the name should read 

 Odostomia {Odetta) lirata A. Adams. 



ODOSTOMIA (EVALEA) SITKAENSIS Clessin. 



Plate XVII, fig. 8. 



Odostomia sitkaen»is Clessin, Mart. ('hem. Conch. Cab., 2d Ed., Pyramid., 1900, 

 p. 121, pi. XXX, fig. 1. 



Shell elongate-conic, very regular in outline, yellowish white, 

 shining. Nuclear whorls almost completely immersed in the first of 

 the succeeding volution. Post-nuclear whorls moderately rounded, 

 rather high between the sutures, slightly shouldered at the summits, 

 marked by many tine lines of growth and numerous tine wavy spiral 

 striations; the latter are more regularly developed and distributed 

 than the lines of growth. (Our figure does not show the spiral mark- 

 ings.) The periphery of the last whorl marks the greatest diameter of 

 the shell. The base, though rather long, falls otl' rather abruptly at 

 the peripher}'^, then tapers graduall}' to the anterior end of the colu- 

 mella; it is marked like the spaces l)etween the sutures. Aperture 

 large, oval; posterior angle acute, outer lip decidedly curved, almost 

 patulous, thin; columella long, slender, gently curved, and some- 

 what reflected, provided with a moderately strong, oblique fold near 

 its insertion. Parietal wall without callus. 



The Berlin collection contains two specimens of this species — No, 

 26232, which were collected by F. Schmidt, at Sitka, Alaska. We 

 have described and figured the most perfect of the two, which we con- 

 sider Clessin's tvpe. This specimen measures: long, -inun.; diam. 2 

 mm. Clessin's figure is worthless, as usual. 



