520 Transactions. 



Rissoina angasi Pease. 



Rissoina angasi Pease, Amer. Journ. Conch., vii, 20, 1872. 



Habitat. — Living under stones near low-water jnark. Coral Bay. Sunday 

 Island. 



Distribution . — New South Wales. 



Rissoina plicata A. Adams. 



Rissoina plicata A. Adams, Pro. Zool. Soc, 1851, 264, 1852. 

 Recorded. Iredale, Pro. Mai. Soc, ix, 71, 1910. 



Habitat. — Dead shells dredged on gravelly bottom near Sunday Island. 

 Distribution. — New Guinea, Fiji, Ellice Group, Hawaii. 



Zebina cooperi n. sp. Fig. 11. 



Description oj Type Specimen. — Shell elongate - ovate, the right side 

 straight, the left slightly convex. Aperture ovate, slightly produced late- 

 rally. Whorls 7. flattened, the suture scarcely marked. Outer lip very 

 thick, with 3 blunt tubercles inside the anterior end. A distinct canal 

 between the posterior end and the body-whorl. Sculpture : Protoconch 

 smooth. First adult whorl with about 12 longitudinal plications. The 

 distance between them increases while their height decreases, until thev 

 become quite obsolete on the 4th whorl. On the parietal wall, near the 

 posterior canal, are 3 minute longitudinal plications. Otherwise the shell 

 is perfectly smooth and glassy, with microscopic axial striations. Colour : 

 Glassy white, the interior structure indicated by darker spiral bands. 



Height, 5 mm. Diameter, 2-4 mm. 



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

 10 m. to 30 m. near Sunday Island. 



Isselia chiltoni n. sp. Fig. 12. 



Description oj Type Specimen. — Shell elongate-ovate, the aperture 

 slightly extended laterally. Whorls 5i, slightly flattened, suture deep. 

 Aperture ovate, notched in front. Columella obliquely truncated anteriorly. 

 Inner lip thickened, forming a callosity at the anterior angle of the colu- 

 mella. Sculpture : Protoconch of 1 whorl, smooth. First adult whorl 

 with about 10 longitudinal plications. On the following whorl the longi- 

 tudinal plications are crossed by 3 spiral ribs, the lowest only being pro- 

 minent, beaded at the intersections. On the penultimate whorl a 4th spiral 

 is added. On the body-whorl above are 9 spiral ribs, forming nodules at 

 the intersections of longitudinal plications ; the 2nd and 3rd spirals approxi- 

 mate, as do the 4th and 5th. On the under-surface these appear as 6 ribs, 

 the upper being double. The interstices between the four anterior spirals 

 about twice the width of the ribs. Colour white. 



Height, 2-8 mm. Diameter, 14 mm. 



Habitat. — Dead shells abundant in dredgings in 10 m. to 30 m. off Sunday 

 Island. 



Epigrus insularis n. sp. Fig. 13. 



Description oj Type Specimen. - Shell elongate, apex blunt, aperture 

 produced, the body- whorl more than half the length of the shell. Whorls 

 4|, loosely coiled, rounded, shouldered above, suture deeply impressed. 

 Aperture oval, peristome continuous, thickened throughout, a distinct 



