Marshall and Murdoch. — Tertiary Mollusca. 135 



spiral threadlets adorn the lower whorls throughout, that margining the 

 suture comparatively large and with a sharply defined lower margin, a few 

 minute threads on its flattened surface, on the last about fifty, those above 

 the angle very slender, below with here and there an alternate larger and 

 smaller threadlet, about equal to the grooves in Avidth. Aperture : Outer 

 lip imperfect ; posterior sinus extending from the angle to the sutural 

 cord ; columella almost straight ; callus thin, not obscuring the spiral 

 sculpture. 



Length, 22 mm. ; width, 7 mm. 



Locality, Hampden. Collected by Dr. Marshall. 



Type to be presented to the Wanganui Museum. 



Of this form there is only one example. It nearest kin are perhaps 

 8. sertula, S. obliquecostata, and S. mordax. - 



Borsonia (Corderia) zelandica Marshall. (Plate VI, fig. 8.) 



.Volutoclerina zelandica Marshall, Trans. N.Z. Inst., vol. 51, p. 230, 

 p. 17, figs. 4 and 5, 1919. 

 The material from which this species was described consists of two 

 rather badly preserved specimens collected by Dr. Marshall at Hampden. 

 The sculpture can be followed fairly well, and the position and form of the 

 posterior sinus is clearly indicated by the well-marked growth-striae. The 

 outer lip being broken away gives a somewhat marked prominence to the 

 two small plaits on the columella, and this may in a measure have influenced 

 the late Mr. Suter when he recommended its inclusion in Volutoderma. We 

 offer a figure of the aperture restored as indicated by the lines of growth. 



Conus (Leptoconus) armoricus Suter. (Plate VI, fig. 9.) 

 N.Z. Geol Surv. Pal. Bull. No. 5, p. 61, pi. 12, fig. 25, 1917. 



As no description of the protoconch is recorded, we offer the following : 

 The specimen has a total of nine and a half whorls, three and a half of which 

 comprise the smooth protoconch, which is sharply conical and slightly 

 oblique ; whorls convex, with somewhat impressed sutures, the initial half- 

 turn minute and somewhat laterally disposed, the third comparatively high, 

 the last half narrowing and merging into the post-embryonic form. 



length, 21 mm. ; width, 11 mm. (dimensions of specimen). 



Locality, Pakaurangi Point, Kaipara Harbour. Collected by Dr. 

 Marshall. 



Conus (Leptoconus) armoricus var. pseudoarmoricus n. var. (Plate VI,*' 



fig. 10.) 



Shell small, spire low, gradated, the body elongated and sharply tapering. 

 Whorls six, excluding the protoconch, which is missing ; each whorl with 

 a pronounced rim-like ridge, which overhangs and partly conceals the suture, 

 giving to the volution a distinctly concave appearance ; the last whorl 

 immediately below the ridged shoulder slightly contracted. Sculpture : 

 On the spire-whorls four or five small spiral threadlets, on the anterior area 

 of the last about twelve well marked and obliquely ascending ; above these 

 a few ill-defined lines which probably are continued to the crown ; axial 

 growth-striae irregular, on the spire distinctly curved, indicating a fairly 

 deep sinus Aperture narrow ; the margins almost parallel ; outer lip 

 imperfect. 



Length, 18 mm. ; width, 10 mm. 



Locality, Hampden. Collected by Dr. Marshall. 



Type to be presented to the Wanganui Museum. 



