Bittium.] GASTROPODA. 243 



line growth-lines ; base with 1 or 2 grooves near the periphery, centre 

 smooth ; some specimens show low varices. Colour bluish, white- 

 banded. Spire high, a little over three times the height of the aperture ; 

 outlines straight. Protoconch minute, mostly eroded. Whorls about 

 11, flatly convex, slowly increasing ; base flatly convex. Suture 

 deep. Aperture oblique, ovate, slightly channelled above, slightly 

 notched and effuse below, but no distinct canal. Outer Up sharp, 

 but slightly convex. Basal lip extending a little below the columella 

 truncation. Columella straight. Inner lip very narrow, spreading 

 over the body to the outer lip. Operculum normal. 



Height, 10 mm. 



Animal unknown. 



Type. Collection of the " Journal de Conchyliologie," Paris. 



Hob. New Zealand. Australia and Tasmania. 



5. Bittium retiferum, Suter, 1908. Plate 14, fig. 14. 



Bittium retiferum, Suter, P. Mai. S., viii, 34, pi. 3, f. 38. 



Shell very small, subulate, thin and fragile. Sculpture consisting 

 of 3 cinguli on the upper whorls, 4 on the body-whorl, the uppermost 

 close to the suture and slightly lower ; crossed by straight equidistant 

 axial riblets, about 20 on the last whorl, interstices with microscopic 

 fine growth-lines ; points of intersection ornamented with round 

 gemmules. Colour yellowish-white. Spire high, conical, much higher 

 than the aperture ; outlines almost straight. Protoconch papillate, 

 of 2 convex smooth whorls, a little deviated from the vertical axis. 

 Whorls about 7, regularly increasing, flatly convex ; base smooth 

 and slightly concave. Suture impressed, channelled by the cinguli. 

 Aperture ovate, vertical, angled above, produced below into a short, 

 widely open, and basally emarginate canal. Outer lip sinuated by the 

 spiral sculpture. Basal lip produced beyond the canal. Columella 

 short, rounded, gently curved off toward the short margin of the 

 canal ; parietal wall concave. Operculum unknown. 



Diameter, 1 mm. ; height, 3-2 mm. 



Animal unknown. 



Type in my collection. 



Hob. Snares, in 50 fathoms (Captain Bollons). 



6. Bittium vitreum, Suter, 1908. Plate 14, fig. 15. 



Bittium vitreum, Suter, P. Mai. S., viii, 34, pi. 3, f. 39. 



Shell small, elongate, thin and fragile, translucent, finely reticulated. 

 Sculpture : The first 2 whorls smooth, the following 4 with 3 sub- 

 equidistant fine spiral threads, and the body-whorl with 5, the two 

 lowest a little stronger than the others ; they are reticulated by sub- 

 equidistant, slightly oblique, and flexuous axial threads, slightly nearer 

 together than the spiral lines ; interstices with fine microscopical 

 growth-striae ; the axial sculpture extending over the base. Colour 



