NO. 2288. yEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 79 



are nodulose where they cross the ribs; axial sculpture of (on the 

 last whorl eight) narrow sigmoid ribs, with wider interspaces, ex- 

 tending from suture to canal across the last whorl; the aperture 

 narrow, the outer lip varicose, smooth within; the inner lip simple, 

 not callous; the anal sulcus large and shallow, the pillar straight, 

 the canal hardly differentiated. Height of shell, 3.25 ; of last whorl, 

 2; diameter, 1.25 mm. Cat. Nos. 269171 and 268038&, U.S.N.M. 



Range. — Head of Concepcion Bay, Lower California, Dr. Paul 

 Bartsch. 



Many of the specimens have the last whorl conspicuously striped 

 with brown. The dead specimens are often slaty with pale spiral 

 threads. There is also some variation in stoutness and in the 

 strength of the posterior thread which in a few specimens is stronger 

 than the others giving a slight shoulder to the whorl. 



CYTHARELLA (AGATHOTOMA) PYRRHULA, new species. 

 Plate 24, fig. 6. 



Shell small, brownish with a white peripheral band, brilliantly 

 polished; with a pointed nucleus of two smooth rounded and one 

 peripherally sharply keeled whorls ; and about six subsequent whorls ; 

 suture distinct, appressed, fascicle constricted; spiral sculpture of 

 about a dozen grooves with wider interspaces on the base and canal ; 

 axial sculpture of (on the last whorl 13) narrow sigmoid ribs ex- 

 tending from the fasciole to the canal with somewhat wider smooth 

 interspaces ; aperture contracted, anal sulcus large, with flaring mar- 

 gin and subsutural callus; outer lip sharp edged, infolded, a promi- 

 nent varix behind it, and under the varix internally a thickened ridge 

 with about five short oblique lirae; inner lip erased; pillar longer 

 with about six lirae ; canal short, deep, moderately recurved. Height 

 of shell, 11; of last whorl, 6.5; diameter, 5 mm. Cat. No. 96590, 

 U.S.N.M. 



Range. — Station 2830, off Lower California, northwest of Cape 

 San Lucas, in latitude 23° 33' N., in 66 fathoms, sand. TJ. S. Bureau 

 of Fisheries. 



CYTHARELLA (AGATHOTOMA) EURYCLEA, new species 



Plate 24, figs. 5, 11. 



Shell minute, whitish or pale brownish, subcylindric, turrited, the 

 nucleus with a projecting minute subglobular apex and about one 

 and a half smooth whorls followed by about four and a half sculp- 

 tured whorls; spiral sculpture of minute close-set threads covering 

 uniformly the whole surface; suture distinct, appressed, the whorls 

 shouldered immediately in front of it; axial sculpture of (on the 

 last whorl seven or eight) prominent, slightly protractively oblique 

 ribs, with wider interspaces, extending over the whole whorl and 



