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 5imm., least 5Jmm. ; height, 2|mm. 



Hab. North Island : Rawene, near Hokianga. 



Mr. R. Murdoch, of Wauganui, 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. sciadium, Pfeiffer. 



10. Phrixgnathus cheesemani, n. sp. Plate XXI., figs. 



40-406. 



Shell conoidly semi-globose, subperf orated, pale-horny, 

 sometimes variegated witla 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 4^mm., least 43iQmm. ; height, 3mm. 



Hah. 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 

 of radula 40 — 1 — 40. Remarkable for the large number of teeth 

 on a transverse row of the radula. 



EXPLANATION OF PLATES XIV.-XXI. 



Plate XIV. 



Pigs. 1, 2. Gundlachia, sp., shell f, River Avon. 



Pig. 3. „ „ shell with septum, River Avon. 



Pig. 4. „ „ jaw, magnified. 



Pig. 5. „ „ teeth of radula, magnified. 



Pig. 6. Athoraco'phoms jpapillattis, animal extended, natural size. 



Fig. 7. ,/ w in repose, 



Fig. 8. „ head from below. (Spirit specimen.) 



Fig. 9. „ anterior part, showing genital orifice. 



(Spirit specimen.) 



