510 STUDIES ON AUSTRALIAN MOLLUSCA, 



by a smooth constricted post-sutural band. These whorls have 

 a dozen apiece of broad low ribs, more opaque than their inter- 

 stices, on the earlier whorls strongly and on the later weakly 

 developed. Each rib projects at the border of the constriction 

 as a nodule and vanishes before reaching the suture. In one 

 example the nodules coalesce into a continuous ridge. Under 

 the lens the entire surface is seen to be sculptured by fine, close, 

 spiral stripe, decussated by equally fine growth-lines. Base 

 rounded, canal short. Columella edged with a callous ridge. 

 Length 15, breadth 4 mm. 



Scaphander multistriatus, Brazier. 



Brazier, Proc. Linn. Soc. N.S. Wales, ii. 1877, p. 84; Pilsbry, 

 Man. Conch, xv. 1893, p. 252. 



(Plate xxvi., tig. 12.) 



Having been favoured by Mr. Brazier with a specimen from 

 Darnley Island, one of the original lot of this species, I am 

 enabled to illustrate it. This individual is 11 mm. long, and 

 3| mm. broad. 



Leucotina helva, n. sp. 

 (Plate xxvi., figs. 19, 20, 21, 22.) 



Shell imperforate, slender, fusiform, thin, translucent and very 

 glossy. Colour pale pink. Whorls eight, flattened, divided by 

 an impressed suture. Sculpture : sharp incised and punctate 

 grooves encircle each whorl; about 16 on the last and 5 on the 

 penultimate. The intervening belts are faintl}' transversely 

 striated. Aperture vertical, pyriform. rounded anteriorly. The 

 columellar plication is so deeply seated that it is invisible in front; 

 if the shell be revolved it comes into sight just as the interior of 

 the aperture closes from view. Length 21, breadth 9 mm. 



Hah. — Off Cape Grenville, North Queensland; one specimen 

 dredged by Mr. J. Brazier in 12 fathoms. 



Type to be presented to the Australian Museum. 



