Mabshall and Murdoch. — Tertiary Mollusca. 131 



Locality, Waipipi, near Waverley, in blue sandy clay. 

 Type to be presented to the Wanganui Museum. 



The sculpture, together with the exceedingly deeply excavated sutures, 

 readily distinguishes it from other Tertiary forms. ' < 



Phalium fibratum n. sp. (Plate VIII, figs. 16, 17.) 



Shell large, ovato -globose, with prominent spiral sculpture. Whorls 

 about seven, lightly angular ; apex minute ; spire short, less than one- 

 quarter the length of the aperture ; the last very large ; on the angle a 

 rather- prominent row of nodules, on the spire above the angle four or five 

 spiral cords, and below the angle two or three, on the last about twenty- 

 three flat spirals more than twice the width of the grooves, the latter 

 becoming deeper on approaching the anterior end, in places there is a small 

 groove on the rib and here and there a small threadlet in the groove ; the 

 axials consist of strong irregular growth-striae which haye a fibrous sub- 

 granular appearance. Sutures lightly impressed, the marginal rib below 

 rather pronounced. Aperture slightly oblique and narrow above, outer lip 

 uniformly curved, thickened and refiexed ; columella short, excavate and 

 twisted, several small denticles above and two or three oblique plaits at the 

 antetior end ; body-whorl and columella with a wide, spreading callus pro- 

 duced anteriorly as a broad flat plait limited to the width of the columella. 



Length, 75 mm. ; width, 60 mm. 



Locality, Waipipi. 



Type to be presented to the Wanganui Museum. 



Of this form there is a single almost perfect specimen. It is allied to 

 P. labiatum var. pyrum Lamk., which is subject to considerable variation in 

 size and sculpture. We have a good series of the latter for comparison, 

 and in our opinion the Waipipi shell is sufficiently different to warrant 

 specific distinction. 



Siphonalia senilis n. sp. (Plate VI, fig. 4.) 



Shell rather small ; canal moderately long ; body-whorl comparatively 

 large. Whorls six or seven, rounded, lightly subangled above the middle ; 

 protoconch of about three and a half turns, smooth ; thence spirally and 

 axially sculptured ; axials nineteen to twenty on the last, feebly raised, 

 more pronounced on the spire ; growth-striae > rather strong ; the spirals 

 in the form of undulating cords, delicately beaded, usually one or two 

 larger beads on the axials, in places an alternate larger and smaller cord, 

 wider- than the grooves except towards the anterior end ; on the pen- 

 ultimate there are eleven to thirteen spirals, the cord at the suture rather 

 pronounced and followed by two or three much smaller. Sutures not deeply 

 impressed. Aperture imperfect. Columella curved, tapering, lightly twisted 

 anteriorly, and thinly callused. 



Length, approximately 17 mm. ; width, 10 mm. 



Locality, Hampden. Collected by Dr. Marshall. 



Type to be presented to the Wanganui Museum. 



There are three examples, somewhat distorted and in rather poor pre- 

 servation. The species may readily be distinguished by the undulating 

 finely beaded cords. 



Admete (Bonellitia) ovalis Marshall. 

 Borsonia {Corderia) ovalis Marshall, Trans. N.Z. Inst., vol. 50, 

 p. 269, pi. 18, figs. 10-lOa, 1918. 

 A further examination of the type proves that it is a member of the 

 Cancellariidae nearly allied to Bonellita as defined by M. Cossmann. 



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