94 ADDITIONS TO THE TASMANIAN MARIN K MOLLUSCA, 



Type, with several others, from Frederick Henry Bay. 

 A variety from C. Pillar has the centre of the whorls 

 smooth. Its nearest ally here, R. layardi, Pett., is a 

 smaller, narrower shell, with fewer and stronger keels. 



PI. V., fig, 27. 



RISSOA FREYCINETI, Sp. Nov. 



Shell minute, white, shining, solid, pyramidal. Whorls 

 four and a half, rounded, including a smooth pullus of two 

 whorls. Adult whorls two and a half, at first with three 

 keels, but others develop, so that there are six to seven on 

 the body whorl. These keels are strong, rounded, and 

 separated by grooves of equal width. Aperture large, 

 ovate, pointed above. Columella lip expanding over I be 

 umbilical area. Outer lip rather thick. 



Length 1.4. Breadth 8 mill. 



Tvpe, with four others, from 40 fathoms, off Thouin 

 Bay, Freycinet Peninsula. I cannot connect this with 

 any known species. 



PI. V., fig. 28. 



ALVANIA THOUINENSIS, Sp. Nov. 



Shell minute, pure white, elongate, whorls four and a 

 half, including a smooth, shining protoconch of one and a 

 half turns. Adult whorls three, rounded; suture canali- 

 culate; first whorl widest at its lower third, where there is 

 a keel, crossed by narrow axial riblets. These riblets con- 

 tinue on the other whorls, but disappear on the base. On 

 the second whorl about four keels appear, which become 

 stronger and more numerous on the body whorl, where 

 there are about ten, and raise small nodules, where they 

 cross the ribs. Aperture pyriform ; columella much 

 rounded: lip somewhat expanded. Outer lip thin and 

 simple. 



Length 1.8. Breadth 0.8 mill. 



Type, with twelve others, from 40 fathoms, off Thouin, 

 Bay. Distinguished by its deeply excavate sutures. 



PI. VI., fig. 29. 



ALVANIA SEMINODOSA, Sp. Nov. 



Shell small, shining, pale yellowish, the central third of 

 the whorl white, elongate. Whorls five ; the protoconch. 

 at first smooth, develops about five faint spirals. Whorls 

 rounded, suture well impressed. The spire whorls bear 



