NO. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 57 



PHILBERTIA AETHRA, new species. 



Plate IS, fig. 6. 



Shell small, acute, pale brownish, with a smooth acute nucleus of 

 tw^o whorls and six subsequent whorls, the first of which has two pe- 

 ripheral spiral threads with an angle at the shoulder; other spiral 

 sculpture of somewhat alternated small uniform close-set threads, 

 made minutel}^ scabrous by the intersection of sharp incremental lines 

 and covering the Avhole surface; axial sculpture otherwise of six 

 prominent sharp vertical ribs with much wider interspaces, practi- 

 cally continuous up the spire and extending from the suture to the 

 canal; aperture narrow, anal sulcus shallow, rounded, not preceded 

 by any obvious f asciole, close to the suture ; outer lip with a thickened 

 varix behind it, sharp edged without internal lirae ; inner lip slightly 

 erased; canal narrow short, distinct. Height of shell, 8; of last 

 whorl, 4.5 ; diameter, 3.3 mm. Cat. No. 211382, U.S.N.M. 



Range. — Station 2823, off La Paz, Lower California, in 26^ 

 fathoms broken shelly bottom. U. S, Bureau of Fisheries. 



PHILBERTIA DICTYNNA, new species. 



Plate IS, fig. 3. 



Shell small, translucent white, with one and a half small smooth 

 nuclear and four subsequent well-rounded whorls ; suture distinct, not 

 appressed; spiral sculpture of (on the last whorl about 10) subequal 

 and equally spaced strong rounded threads, nodulous on the 

 periphery where they intersect the ribs and feebler on the canal; 

 axial sculpture of (on the last whorl about 10) short rounded ribs 

 prominent only near the periphery and with wider interspaces; aper- 

 ture elongate-ovate, anal sulcus wide and very shallow, outer lip 

 thin, smooth inside, moderately produced; inner lip erased, pillar 

 short, canal very short, slightly recurved. Height of shell, 3.8; of 

 last whorl, 2.7 ; diameter, 2 mm. Cat. No. 4085, U.S.N.M. 



Range. — Cape San Lucas, Lower California ; J. Xantus. 



PHILBERTIA SCAMMONI, new species. 

 Plate 18, fig. 1. 



Shell small, whitish, with brown interspaces or bands, more or less 

 variable; nucleus small, blunt, turbinate, the first whorl smooth, the 

 third obliquely minutely axially ribbed ; subsequent whorls five, with 

 a rather deep suture the whorls rounded, uniformly sculptured; 

 spiral sculpture of two kinds, on the spire two major threads near 

 the periphery and four on the last whorl, whiter than the rest of the 

 surface; in the interspaces much finer threads, the major threads 

 hardly swollen where they override the ribs; on the base the sculp- 

 ture takes the form of flattish bands appressed on the anterior edge, 

 about four in number, on the canal are only four or five close-set 



