NO. 228S. NEW AIOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 



Range. — Station 2830, off Cape San Lucas, in 66 fathoms, sand ; 

 U. S. Bureau of Fisheries. 



The absence of the opercuhim makes the generic position somewhat 

 doubtful. 



Subgenus Knefastia Dall. 



Type. — Pleurotoma oUvacea Sowerby, 1833, not of Reeve, 1843, 

 -\-funiculata Valenciennes, 1839. 



Tliis includes such species as P. dwplicata Sowerby and olivacea 

 Tiyon, of the Panamic fauna. 



TURRICULA (KNEFASTIA) NIGRICANS, new species. 



Plate 2, fig. G. 



Shell slender, acute, blackish brown with the anterior part of the 

 last whorl pale reddish brown, a conspicuous periostracum, a closely 

 appressed suture separated by a single cord from the constricted 

 anal fascicle; whorls nine, without the (lost) nucleus; axial sculpture 

 of (on the last whorl eight) prominent angular ribs with wider 

 interspaces, beginning abruptly at the shoulder rapidly dwindling 

 anteriorly and obsolete on the base; these ribs are crossed by (on the 

 last whorl about 14) widely spaced slender cords, slightly nodulous 

 at the intersections; aperture narrow, anal sulcus shallow, outer lip 

 sharp, simple, a slight subsutural callus, the inner lip erased, the 

 pillar straight, the canal wide and very slightly recurved. Height 

 of shell, 38; of last whorl, 22; diameter, 11 mm. Cat. No. 96664, 

 U.S.N.M. 



Range. — Off Lower California in 21 fathoms sand. U. S. Bureau 

 of Fisheries steamer Albatross. 



This species belongs to the group of T. olivacea and dwplicata 

 Sowerby, though much more slender and differently sculptured. 



TURRICULA (SURCULA) LAYSANICA. new species. 



Plate 1, fig. 4. 



Shell slender, fusiform, yellow brown with a broad white periph- 

 eral band, and a less well-defined one in front of the suture and the 

 base, with eight well-rounded whorls exclusive of the (lost) nucleus; 

 the suture appressed, the fasciole in front of it constricted, with only 

 incremental lines ; axial sculpture of about 15 slender rounded some- 

 what sigmoid ribs; these are crossed by (on the penultimate whorl 

 seven or eight, on the last whorl more than 15) flattened cords with 

 narrower almost channeled interspaces, toward the canal with inter- 

 calary threads, on the canal four or five with much wider interspaces ; 

 aperture ovate, outer lip thin, anal sulcus wide, not deep, with no 

 subsutural callus, canal straight. Height of shell, 52; of last whorl 

 and canal, 33; diameter, 15 mm. Cat. No. 274121, U.S.N.M. 



Range. — Laysan Island, North Pacific Ocean; W. H. Golisch. 



