V0 18S9 X "'] PROCEEDINGS OF THE NATIONAL MUSEUM. 327 



interspaces; incremental lines not prominent; spiral sculpture of (in 



addition to the presutural threads above mentioned) numerous rather 

 faint threads on the base of the last whorl and on the canal ; surface 

 somewhat polished with a very thin epidermis; aperture short, wide, 

 with a thin, simple outer lip, perhaps thickened later; no internal lira 1 ; 

 inner lip with a smooth, moderately thick, white callus; canal very 

 short and slightly recurved ; edge of the pillar raised and sharp. Max- 

 imum longitude of shell (without nuclear whorls), 10; diameter, <!""". 



Hab.— Station 2807, near the Galapagos Islands, in 812 fathoms, 

 ooze; temperature 38°.4 F. 



This species is nearest to X. bdbylonica Watson, from near the Philip- 

 ine Islands, and like that has a chrysodomoid operculum. It is, how- 

 ever, stouter, with a proportionately shorter spire, compared with the 

 last whorl, and is more inflated. The operculum is also more elongated. 



This species is named in honor of Mr. C. II. Townsend, of the ('. S. 

 Fish Commission, one of the naturalists connected with the Albatross 

 in her later explorations. 



Family COLUMBELLID^. 

 Gemis COLUMBELLA Lamarck. 



Section ASTYR1S H. & A. Adams. 

 Columbella permodesta sp. nov. 

 Plate v, Fig. 4. 



Shell small, thin, polished, 'with live rounded whorls, a pale yellowish 

 epidermis covering a bluish white substratum; transverse sculpture 

 only of faint incremental lines; spiral sculpture of tine spiral threads on 

 the base of the shell, obsolete or absent between the sutures; aperture 

 wide, oval; outer lip thin, simple, very slightly reflected ; axis pervious; 

 canal wide, extremely short, hardly differentiated; pillar smooth, 

 twisted, not callous ; suture distinct, not appressed or channeled; nu- 

 cleus rounded, slightly flattened, generally eroded. Maximum longi- 

 tude of shell, 14; maximum latitude, 7 u,m . 



HAB. — Station 2840, off the Santa Barbara Islands, California, in 

 270 fathoms, mud. 



The soft parts of this animal are of a greenish white color. The foot 

 is unusually long, narrow, pointed behind, double-edged, truncate, and 

 distinctly auriculate in front. The tentacles are very short, stout, 

 blunt, and stand straight forward with a notch between them rather 

 than laterally from the head ; the basal part is swollen outwardly and 

 there are pigmented eyes, but so hidden beneath the cuticle as to 

 be readily overlooked when the latter is rendered opaque by alcohol. 

 The sides of the foot are smooth, they are marginated below as in 

 Lima.r, so that the sole is distinctly marked off from the upper surface. 

 The whole animal exudes an abundant mucus. The proboscis is stout, 

 its opening notched below. The gills are rather large, but otherwise 



