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SuteR.—On New Zealand Mollusca. 137 
perspective, limited by a carina which forms a sinus at the 
base of the columella. Base flattened. 
Diameter, greatest 54mm., least 54mm. ; height, 24mm. 
Hab. North Island: Rawene, near Hokianga. 
Mr. R. Murdoch, of Wanganui, has been the discoverer of 
this most beautiful shell, and I have much pleasure in uniting 
his name with the species. 
Note.—Only one empty shell was found, and the animal 
therefore remains unknown for the present. Its nearest ally 
is Ph. sciadwwm, Pfeiffer. 
10, Phrixgnathus cheesemani, n. sp. Plate XXI., figs. 
40-400. 
Shell conoidly semi-globose, subperforated, pale-horny, 
sometimes variegated with light-brown zigzag bands, which 
are close together, and tessellating the base; rather shining, 
thin, diaphanous, with irregular close-set growth lines, which 
are very indistinctly reticulated above by spiral lines. Spire 
conoidal, apex rather blunt. Embryonic whorl minutely 
spirally striated. Periphery angled. Whorls 6, slowly and 
regularly increasing, slightly rounded; suture not much im- 
pressed. Aperture oblique, broadly lunar; peristome simple, 
straight, acute, outer lip somewhat arched, forming an angle 
with the basal lip, which forms one broad arch with the 
columella, the latter being somewhat reflexed. Umbilicus 
almost completely closed up by the columella reflection. 
Base spirally striated, flatly rounded. | 
Diameter, greatest 44mm., least 44,mm.; height, 3mm. 
Hab. North Island: Waitakerei, near Auckland. 
Named in honour of Mr. T. F. Cheeseman, curator of the 
Auckland Museum, to whom I am indebted for the speci- 
mens. 
Dentition.—That characteristic of Phrixgnathus. Formula 
ofradula 40—1—40. Remarkable for the large number of teeth 
on a transverse row of the radula. 
EXPLANATION OF PLATES XIV.-XXI. 
PLATE XIV. 
Figs » 2. Gundlachia, sp., shell #7, River Avon. — 
Fig. ” , shell with septum, River Avon. 
Big. ” » jaw, magnified. 
Fig. teeth of radula, magnified. 
Mu 
" in repose, ” ; 
: head from below. (Spirit specimen.) 
anterior part, showing genital orifice. 
(Spirit specimen.) 
i 
3 
4 
5. ; 
m Tig. 6. Athoracophorus papillatus, animal extended, natural size. 
(2 
8 
9 
