SuTER.— O^i N.Z. Land and Fresli-water Sliclls. 221 



Art. XXIY. — Descriptions of New Species of New Zealand 

 Land and Frcsli-icater Shells. 



By H. SuTEK. 



^Bead before the Philosophical Institute of Canterbury, 7th November, 



1889.] 



Plates XIV. and XV. 



Shortly after arrival in this beautiful colony, in January, 

 1887, I began to collect land and fresh-water shells, for a few- 

 weeks near Wellington, and afterwards, up to October of last 

 year, in the southern part of the Forty-mile Bush. Since 

 November, 1888, I have collected in the neighbourhood of the 

 Mount Cook Hermitage. I have succeeded in finding a con- 

 siderable number of new species, all, with a few exceptions, 

 very small and scarce. This circumstance explains fully why 

 they hitherto have been overlooked. In the following pages I 

 wish to give the descriptions of all the new shells I found in 

 the Forty-mile Bush, and of two from the Hermitage. Next 

 winter I hope to be able to complete this paper by giving the 

 descriptions of the animals, as far as they are known to me, 

 their position in the system, and descriptions of some more 

 new species found near the Hermitage. 



It is an agreeable duty for me to tender my best thanks 

 to Professor F. W. Hutton, who from the very first a.ssisted 

 me so kindly, up to the present day, with his great knowledge 

 in couchology. I have also to thank Professor A. Mousson, 

 of Ziirich, for his valuable communications on New Zealand 

 Mollusca. 



Helix pseudoleioda, n. sp. Plate XIV., fig. 1, a-c. 



Shell small, globose, yellowish-white, banded with some- 

 what backwards-directed brown streaks, faintly shining, 

 closely ribbed, ribs on upper surface straight, a little undulat- 

 ing outside ; ribs about 38 in the tenth of an inch (15 per 

 mm.). Spire globosely elevated, less rounded at the base. 

 Whorls 6, round, very slowly increasing, the last not descend- 

 ing. Suture pretty deep. Aperture Innately rounded, slightly 

 oblique, excavated by the penultimate whorl. Peristome 

 straight, not dilated, acute, margins distant, columellar mar- 

 gin slightly descending. Aperture with 12 laminao — 3 on 

 the penultimate whorl, 1 on the columella, and 8 on the 

 parietal wall. The lowest plait on the penultimate whorl 

 is strongly developed ; the plait on the columella also is rela- 

 tively large, tongue-shaped ; the laminae on the parietal wall 

 are fine, long, the four lower ones are more apj)roached than 

 the others. Umbilicus very narrow, deep, open. 



