Hutton. — On Neiv Zealand Land Shells. 161 



Art. VII. — Notes on some New Zealand Land Shells, ivith DescrijMons of 



new Species. By Professor F. W. Hutton. 



[Read before the Philosophical Institute of Canterbury, 1th June, 1883.] 



Plates IX.-XI. 



I havk divided this paper into two portions, the first containing descriptions 



of the animals and dentition of species that have already been described, 



the second containing descriptions of new species. In the first part I have 



arranged the species according to the Manual of New Zealand Mollusca 



(1880), and under the same names as there given, although the dentition 



proves in many cases that this arrangement is quite wrong. I hope shortly 



to offer a paper containing a new and more natural grouping of all our Land 



Mollusca. 



A. Old Species. 



Patula pilula, Eeeve (= iota, Pf.). PI. ix, fig. k., and pi. xi., fig. m. 



Jaw arcuate, with about 35 flat ribs, which indent the concave but 

 not the convex margin. 



Dentition, 27-1-27, varying from 25 to 29. Laterals from 13 to 15. 



Central tooth small, narrower in front than behind, longer than broad, 

 the reflexed portion constricted at the sides, covering about half the base, 

 with a rather large acute point. First lateral like the central but larger ; 

 the other laterals with a deep notch on the outer side of the reflexed portion, 

 the cutting point increasing in length outwards. Marginals broader than 

 long, the inner with a cutting point and a denticle on each side of it ; the 

 outer serrated, one of the inner points longer than the others. 



Rah. Auckland (T. F. Cheeseman). 



Patula dimorpha, Pfeiffer. PL ix., fig. v. 



Jaw slender, slightly arcuated, with about 35 flat ribs which indent 

 both surfaces. 



Dentition, 35-1-35, with 18 laterals in a large specimen. In smaller 

 specimens the number of teeth is sometimes as few as 22 with 10 

 laterals. 



Central tooth with the base narrower in front, longer than broad ; reflexed 

 portion narrow, two-thirds the length of the base, with a minute lateral 

 cusp on each side, the point moderate. Laterals with the inner side of the 

 reflexed portion sinuated, outer side with a short, broad, emarginate process, 

 the cutting points longer than on the central tooth. Marginals at first 

 longer than broad, but near the exterior broader than long ; the inner with 

 a bidentate point ; the outer also with a bidentate point, and one or two 

 smaller ones outside it. 



Hah. Auckland (T. F. Cheeseman). 

 11 



