Marshall. — Tertiary Molluscam Fa nun of Pakaurangi Point. 269 



anterior one passes into the aperture. There are many other spiral threads 

 on the body-whorl, every alternate one being relatively small. 



A very common species at Pakaurangi Point, no fewer than forty 

 specimens being obtained. Type in the Wanganui Museum. 



Borsonia (Cordieria) ovalis n. sp. (Plate XVIII, figs. 10, 10a.) 



Shell small, oval, 13 mm. by 9 mm. Spire short, consisting of 4 rapidly 

 diminishing whorls. Outline of whorls slightly convex. Aperture oval, 

 rather less than half the length of the shell. Outer lip thick, inner lip not 

 callous. The columella with 3 distinct folds. Aperture obtuse anteriorly. 

 Ornamentation: Each whorl. with about 15 radial costae slightly raised 

 and continuous from suture to suture : these costae are turned slightly 

 backward. A number of sharp spiral threads, which, however, are inter- 

 rupted, on the costae. Suture impressed and not bordered. On the 

 body-whorl the costae decrease anteriorly, and are not distinct on the base. 

 Many of the spiral threads, however, continue into the aperture. 



One specimen only, in a good state of preservation. I am indebted to 

 Mr. Suter for placing this specimen generically. Type in the Wanganui 

 Museum. 



Drillia tenuispiralis n. sp. (Plate XIX, figs. 11, 16.) 



Shell small, turreted, 12 mm. by 4 mm. ; fusiform in shape, with a taper- 

 ing spire consisting of 7 whorls. Outline of each whorl strongly convex. 

 Aperture rather more than one-quarter the length of the shell, with a 

 short anterior canal and a deep anal slit. Each whorl with 6 prominent 

 radial costae, which extend from the anterior suture for two-thirds of the 

 breadth of the whorl. At this point they terminate abruptly, and leave 

 the posterior portion of the whorl almost smooth. The anterior part of each 

 whorl is marked with numerous extremely fine spiral lines. On the body- 

 whorl the radial costae are far less prominent, and towards the outer lip 

 they are replaced by prominent lines of growth. Spiral threads are con- 

 tinued to the end of the anterior canal. A slight callosity on the columella. 



Mr. Suter remarks that this species conies nearest to D. costifer Suter. 



A single specimen, but in excellent condition. Type in the Wanganui 

 Museum. 



Mangilia axialis n. sp. (Plate XIX, figs. 10, 14.) 



Shell small, fusiform, 6 mm. by 2*5 mm. Spire consisting of 5 strongly 

 convex whorls. Aperture oval, more than one-third but less than one-half 

 the length of the shell. A very short anterior canal. Outer lip thick. 

 Columella' smooth. Ornamentation : Strong axial ribs to the number of 

 12 on each whorl : they are rounded and extend from suture to suture, 

 and are bent slightly forward in the lower part, though broader in the middle 

 than elsewhere. A large number of fine spiral lines, which are more pro- 

 minent in the interstices than on the ribs. Body-whorl with the same 

 ornamentation, the axial ribs extending almost to the end of the short canal. 

 Protoconch of 3 perfectly smooth whorls. 



Rather similar to M. tenuispiralis, but the spiral lines of M. axialis are 

 finer, the axial ribs less pronounced, the body-whorl ribbed, and the form 

 is more slender than in M. tenuispiralis. 



Three specimens, one in very good condition. Type in the Wanganui 

 Museum. 



