240 PROCEEDINGS OF THE ACADEMY OF [1895. 



all the three species, though they belong to different sections of 

 Helicter, all of which are arboreal. 

 Helicter (Amastra) rubicunda Baldwin. , 



Helicter (Amastra), n. sp. 



These two species, belonging to the same section; differ very 

 much in dentition from the foregoing species. The jaw, PI. XI, 

 tig. 54, is solid, dark brown, horse-shoe-shaped, and beautifully 

 finely striated vertically. The radula is tongue-shaped, the teeth 

 arranged in almost straight transverse rows, and they are very 

 much the same in both species, varying only in their number. Thus 

 Amastra rubicunda has the formula 18.10. 1.10. 18 and Amastra 

 n. sp. 22.12.1.12.22. It is hardly necessary to give a description 

 of the raduhe, fig. 56, showing the most characteristic teeth of A. 

 rubicunda. It niay, however, be mentioned that the rhachidiau and 

 the laterals resemble somewhat those of Achatina, but the marginals 

 are pectinate. The species of Amastra are not arboreal, but live 

 on the earth. 



Christchurch, New Zealand, August 8, 1894. 



