532 Transactions. 



above .which there is another ill-defined spiral groove. Base with numerous 

 growth-lines. Colour white. 



Height, 2 mm. Diameter, 0-9 mm. 



Habitat. — Dead shells dredged on gravelly bottom in 10 m. to 30 m. off 

 Sunday Island. 



Raoulostraca n. gen. 



.Shell elongate-ovate, obtuse. Body-whorl nearly half the length of the 

 shell. Protoconch of 1 whorl, apex sinistral. Whorls flat, suture scarcely 

 impressed. Aperture ovate. Inner lip thick, continuous to suture. 



Type. — Raoulostraca inexpectata Oliver. 



Raoulostraca inexpectata n. sp. Figs. 24 and 24a. 



Description oj Type Specimen. — Shell elongate-ovate, sides nearly straight. 

 Apex sinistral, its convolution easily seen through the semi-transparent 

 covering of the first adult whorl. Whorls 6, flat, suture but slightly marked. 

 Aperture ovate. Outer lip thickened anteriorly. Inner lip thick, con- 

 tinued back to the suture with a distinct groove between it and the body- 

 whorl. Sculpture : Shell quite smooth. Colour a rich brown, darkest on 

 the upper part of the whorls. 



Height, 4-4 mm. Diameter, 1-4 mm. 



The type is an average-sized specimen. A single large specimen has 

 7 whorls, and measures — height, 6-3 mm. ; diameter, 1-7 mm. 



Habitat. — Dead shells abundant in dredgings on gravellv bottom in 

 10 m. to 30 m. off Sunday Island. 



Melanella kermadecensis n. sp. Fig. 25. 



Description oj Type Specimen. — Shell subulate, apex blunt, right side 

 nearly straight, left side slightly curved outwards. Whorls 6, flat, suture 

 scarcely distinguishable. Aperture ovate, not much produced. Lip thick. 

 Shell smooth, white, and shining. 



Height, 2-8 mm. Diameter, 0-9 mm. 



Habitat. — Dead shells common in dredgings on gravelly bottom in 

 10m. to 30 m. off Sunday Island. 



Melanella perplexa n. sp. Fig. 26. 



Description oj Type Specimen. — Shell subulate, tapered irregularly, 

 apex acute. Right side nearly straight, but the apex tilted to one side ; 

 left side very slightly curved. Whorls 11, flat, suture scarcely marked. 

 Aperture broadly ovate, the outer lip produced laterally beyond the line of 

 the spire, and produced and expanded in front. Above the suture a spiral 

 line is visible. Shell smooth, white, shining, translucent. 



Height, 4-8 mm. Diameter above aperture, 1-4 mm. 



A perplexing species, owing to the curious appearance of specimens of 

 various ages of growth, caused by the tilted apex being at different angles 

 to the aperture. 



Habitat. — Dead shells abundant in dredgings on gravelly bottom in 

 10 m. to 30 m. off Sunday Island. 



Melanella spinosa n. sp. Fig. 28. 



Description oj Type Specimen. — Shell narrow subulate, slightly curved 

 to the right, the greatest curvature being near the apex. Whorls 10, flat, 



