18 PEOCEEDINGS OF THE XATIOXAL MUSEUM vol.69 



portion passing over the preceding whorl as a slight glaze. The 

 anterior limit of the appressed portion shows through the shell as a 

 false suture which is far more conspicuous than the actual suture 

 which is scarcely perceptible. Periphery well rounded. Base long, 

 well rounded. Aperture very long, pear-shaped; posterior angle 

 acute; outer lip protracted in the middle; inner lip long, slightly 

 concave, reflected over and appressed to the base for its entire length ; 

 parietal wall covered with a thick callus that renders the peritreme 

 complete. 



The type (Cat. No. 363098, U.S.N.M.) has six and one-half whorls 

 and measures, length, 4.2 mm.; diameter, 1.1 mm. Cat. No. 363099, 

 U.S. N. M., contains an additional specimen. 



STROMBIFORMIS INCA, new species 



Plate 3. fig. 11 



Shell acicular, large, thin, semitranslucent. Nuclear whorls decol- 

 lated. Postnuclear whorls high between summit and suture, almost 

 flattened, marked b}^ incremental lines only excepting an occasional 

 varix placed at irregular intervals. Summit of the whorls appressed 

 and exceedingly attenuated so as to form an almost invisible suture. 

 The posterior limit of the interior of the whorls shines through 

 at the summit and gives an appearance of a suture which is far 

 more conspicuous than the real suture. Periphery slightly rounded. 

 Base rather long, moderately rounded. Aperture long, pear-shaped ; 

 outer lip thin (fractured) ; inner lip reflected and appressed to the 

 base; parietal wall covered by a rather thick callus. 



The type (Cat. No. 363100, U.S.N.M.) has lost the nucleus and 

 probably the first one and one-half postnuclear whorls. The eight 

 and one-half remaining measure, length. S.l mm. ; diameter, 1,7 mm. 



STROMBIFORMIS SALSA, siev, species 



Plate 3, fig. 4 



Shell of medium size, acicular. Nuclear whorls decollated. Early 

 postnuclear whorls moderatel}^ rounded, the later ones flattened, thin, 

 semitranslucent, flesh-colored, with two irregularly developed bands 

 of brown, one of which marks the periphery; the other is a little 

 nearer the peripheral zone than the summit. In addition to this 

 there are irregularly distributed varicial streaks of brown which 

 terminate abruptly at their left margin and fade into inconspicu- 

 ousness to the right, the summit of the whorls appressed and so at- 

 tenuated as to form a scarcely perceptible suture. The posterior 

 limit of the interior of the whorls shines through the substance of the 

 shell as a conspicuous line whicli appears as a false suture which is 



