Marshall. — Tertiary Molluscan Fauna of Pahaurangi Point. 265 



Several specimens, in good condition. Type in the Wanganui Museum. 



This species most closely resembles S. costata, but the anterior canal is 

 more bent and the costae less pronounced, though the spiral ribs are more 

 distinct. 



Coptochetus zelandicus n. sp. (Plate XXII, fig. 13.) 



Shell of moderate size, 24 mm. by 8 mm., of a fusiform shape, with a 

 - 1 >ire of 5 whorls. Whorls slightly convex in outline and gradually decreasing 

 in size. Body- whorl somewhat incomplete. Aperture narrow and extended 

 somewhat anteriorly into a moderately long canal. Columella smooth and 

 almost straight. Ornamentation : Each whorl has 18 or 19 radial ribs. The 

 ribs are rounded, continuous, and of equal height from suture to suture. 

 The ribs are crossed by about 9 spiral threads of small size on each whorl. 

 Suture with a sharp border on the anterior margin. Body- whorl with 

 similar ornamentation to that of the spire. The radial ribs appear to 

 extend to the end of the anterior canal, though the imperfect condition 

 of the specimen does not show this clearly. 



One specimen only, in an imperfect state. Type in the Wanganui 

 .Museum. 



I am indebted to Mr. Suter for suggesting that the specimen should be 

 referred to this genus, though he states that he is not certain that it is 

 correct. 



The genus Coptochetus appears to be restricted to the Oligocene and 

 Eocene. It occurs in Europe and Australia. 



Phos kaiparaensis n. sp. (Plate XVIII, figs. 4, 4a.) 



Shell small and oval, 7 mm. by 5 mm. Spire of 5 whorls, three of which 

 are apparently the protoconch. Aperture less than half the length of the 

 shell, broadly oval but narrowing anteriorly to a very short canal slightly 

 bent backwards. Ornamentation : 10 radial costae on each whorl, broad 

 and rounded but most prominent near the anterior suture. The whorls of 

 the protoconch have no costae. There are a large number of spiral ridges 

 on each whorl, well rounded, and continuous across the costae. On the 

 protoconch the threads are relatively larger and less numerous. On the 

 body-whorl the costae decrease in size anteriorly and end at about two- 

 thirds of its length. The spiral ridges extend to the end of the short siphon. 

 Suture impressed but not bordered. 



One specimen only, in good condition. Mr. Suter thinks that it is not 

 mature Type in the Wanganui Museum. 



Phos spiralis n. sp. (Plate XVIII, figs. 5, 5a.) 



Shell small, oval, 10 mm. by 6 mm. Spire consisting of 5 whorls 

 rapidly decreasing : two of these are the protoconch. Aperture oval, 

 rather less than half the length of the shell. The aperture narrows some- 

 what anteriorly and forms a short canal. There is a slight callosity on the 

 columella, which is a little bent over to the left. Ornamentation : Axial 

 costae 13 in number, broad and low, extending from suture to suture. 

 They are crossed by a number of relatively large spiral ridges. There are 

 5 of these in the penultimate whorl, and they cross the costae without 

 diminution. Protoconch smooth. Outline of whorls convex, suture im- 

 pressed. The costae on the body-whorl become less prominent towards 

 the anterior end, but the spiral threads are continuous. 



One specimen only, in a good state of preservation. Mr. Suter thinks 

 that it is not mature. Type in the Wanganui Museum. 



