136 Transactions. — Zoology. 



N.Z. Inst., vol. xvi., p. 163) descriptions of C. anguiculus. 

 The interstices between the riblets are more distinctly reticu- 

 lated in the variety. 



Hah. North Island: Hunua Eauge (Captain T. Brounj. 



Genus Laoma, Gray. 



8. Laoma ciliata, n. sp. Plate XXI., figs. 38, 38a. 



Sliell minute, pupiform, perforated, pale-horny without 

 markings, not shining, very thin and fragile, diaphanous, with 

 oblique somewhat distant thin ribs, about six per millimetre, 

 which are produced into a tooth-shaped membrane below the 

 suture ; a second row of cihse is on the body-whorl round the 

 base, but they are mostly rubbed off; interstices with fine 

 growth-lines. Spire elevated, first cylindrical, then dome- 

 shaped. Embryonic whorl smooth, blunt. Periphery angled 

 and sinuated. Whorls 6, the first three very slowly, the 

 others more rapidly increasing in size ; they are slightly 

 convex above, rather concave below, the last carinated near 

 the aperture ; suture not deep. Aperture transverse, squarish, 

 the outer lin sinuated, the basal slightly arched, and the colu- 

 mella almost straight and vertical, but little expanded above. 

 Mouth with two lamellse ; one slender, long lamella on the 

 middle of the outer lip, and a similar one in the angle where 

 the outer and basal lip meet. Umbilicus previous, very nar- 

 row, but open. Base almost flat. 



Diameter, Ifmm. ; height, 2mm. 



Hah. North Island : Near Wanganui, where it was dis- 

 covered by our most enthusiastic conchologist, Mr. E. Mur- 

 doch. 



Note. — This highly-interesting little shell is totally different 

 from most of the other species of Laoma s. sir.; in the pecu- 

 liarities of the epidermis it is allied to Phrixgnathus rcgularis, 

 yEscJirodomus, and TJierasia celinde and tamora. 



Dentition very much the same as in Laoma leimonias. 

 Formula of teeth 15 — 1 — 15. 



9. Phrixgnathus murdochi, n. sp. Plate XXI., figs. 39-39Z;. 



Shell depressed conoidal, broadly umbilicated, pale-horny, 

 waxen, thin, diaphanous; finely and closely radiately striated, 

 striae crossed by microscopical spiral lines ; spire somewhat 

 dome-shaped, rather acute at the apex ; embryonic whorl 

 smooth ; periphery carinated. Whorls 6, slowly and regu- 

 larly increasing, flatly concave, strongly margined, margin 

 projecting, tessellated with white and chestnut, the last not 

 descending in front ; suture superficial. Aperture squarish, 

 diagonal ; peristome straight, acute, outer lip sinuated, basal 

 lip nearly straight, columella straight, slightly oblique, a little 

 reflexed above. Umbilicus broad, 45 per cent, of the diameter, 



