652 GASTROPODA. [Pulmonata. 



Animal with a well-developed caudal gland. 



Jaw. Rod i da, and Reproductive Organ*. Plate 1, fig. 12. 



Jaw slightly arcuate, narrower in the middle, very thin, consisting 

 of about 45 narrow straight plaits, lying close together, which are 

 finely longitudinally striate. and indent the cutting-edge. 



Radula has the formula 23 + 10 + 1 + 10 + 23. The central 

 tooth is long and narrow, reflected portion short, tricuspid, covering 

 about one-third of the basal plate ; the median cusp is short and broad, 

 with a small rounded mesocone ; the lateral cusps minute. The laterals 

 with a short broad inner cusp, with short rounded cone, and a small 

 outer cusp, in the outer laterals the inner cusp is strong and broad. 

 Marginals tricuspid, short and broad, the mesodont at first flanked 

 by a narrow sharp endodont, and at a wider interval by a small ecto- 

 dont ; gradually the endodont and mesodont coalesce, till they finally 

 form a single bifid denticle, with a small separate ectodont ; the 

 last marginal minute, with a small denticle. 



Reproductive Organs. There is a long vestibule ; the male organ 

 is stout, broad, somewhat enlarged below the middle, constricted 

 above it, the distal end is flatly convex, the retractor muscle inserted 

 at its anterior side, on the posterior side the vas deferens enters. A 

 rather long distance from the juncture of the male organ with the 

 vestibule, on the opposite side, the long subcylindricnl receptaculum 

 seminis arises : this tapers off at its extremity, and forms a rather 

 long filiform caecum, slightly globular at its end. The most interesting 

 feature in these reproductive organs is ;i. fan-shaped radially grooved 

 appendiculum just opposite the receptaculum seminis. 



Type in my collection. 



Ha&. Atthe foot of Mount Stuk. s, M.-M-lbnrougli. type (MrMahon) : 

 Happy Valley. Canterbury (F. Surer). 



Genus 6. SERPHO. Hutton, 1904. 



Serpho, Hutt,, P.L.S. N.S.W., xxix, 1904, 461. Type : Nanina (?) Kivi, 

 Gray. Carthcea, Hutton, T.N.Z.I., xvi, 1883 (1884), 189 ; not of Walker, 

 1858, in Lepidoptera. 



Animal heliciform, with a mucous caudal gland. Jaw formed by 

 many quadrate overlapping plates, each higher than broad. Radula 

 with broad blunt mescdonts on the central and lateral teeth, marginals 

 with several cutting-points, the inner one bluntly bidentate. 



Shell conoidly globose, the whorls slowly increasing ; sub- or im- 

 perforate ; aperture lunate ; peristome straight, acute ; the columellar 

 margin rather reflexed. 



Distribution. New Zealand. 



A species from Norfolk Island (lliiix Stoddarti. Gray) has been 

 classed under this genus, although the animal of that species is still 

 unknown. I think it belongs to another genus, and not to the Pkenaco- 

 helicidce at all. But there is a species from Natal apparently nearly 

 Allied at least, as far as shell-characters go : Phas-i* inchif. Morelet. 



