Marshall. — Tertiary Molluscan Fa nun of Pakaurangi Point. 267 



One specimen only, in good condition. Type in the Wanganui Museum. 

 Mr. Suter thinks that this species is closely related to M . choava Eeeve, 

 but is distinct from it. 



Ancilla spinigera n. sp. (Plate XX, figs. 1, la.) 



Shell of moderate size, 23 mm. by 14 mm., oval in shape, but the spire 

 is extremely short, and is completely covered with a callus from which 

 the protoconch projects as a small spine. Aperture three-quarters the 

 length of the shell. The grooves in the columella are well marked, but 

 towards the base of the columella it becomes extremely callous. Fasciole 

 well marked. The body- whorl has distinct growth-marks, and on the 

 callus there are some indistinct radial mark-. The callus extends forward 

 from the columella over the body-whorl for about one-third of its circum- 

 ference, reaching as far as the fasciole. Three specimens, two of them in 

 good condition. Type in the Wanganui Museum. 



Ancilla cincta n. sp. (Plate XX, figs. 2, 2a.) 



Shell of moderate size, 28 mm. by 13 mm. ; form elliptical, the proto- 

 conch projecting as a sharp point. Spire short, and completely covered 

 with callus. Aperture nearly two-thirds the length of the shell. Columella 

 callous, and the callosity extends forward a short distance over the body- 

 whorl. On the callosity which covers the spire a few spiral ridges are rather 

 evident : these apparently indicate the whorls of the spire, which thus 

 seems to consist of 4 whorls. Lines of growth are distinct over that part 

 of the body-whorl that is not covered with callus. 



One specimen only, in a fair state of preservation. Type in the 

 Wanganui Museum. 



Surcula latiaxialis n. sp. (Plate XX, figs. 3, 3a.) 



Shell rather large, 34 mm. by 11 mm. Shape fusiform, with a long spire 

 of 5 whorls, which are strongly convex. Aperture slightly longer than the 

 spire, but oval in shape, though rather prolonged anteriorly. Columella 

 distinctly bulging at the point where the aperture narrows to the anterior 

 canal. Ornamentation : 7 prominent axial costae in each whorl ; these 

 extend to the anterior suture, which bends forward slightly at the points 

 where the axials reach it. Posteriorly the axial sutures stop short of the 

 suture ; anteriorly the sutures are margined by a strong ridge, which is 

 itself marked by extremely fine spiral lines. Whorls marked by numerous 

 fine spiral lines, which traverse the axial costae as well as the other parts of 

 the whorl. The spiral lines are finer and more numerous in the posterior 

 part of the whorl, and are coarsest where they cross the axials. These are 

 crossed by irregular lines of growth, the form of which indicate that the 

 anal sinus was relatively shallow. The outer lip is not sufficiently well 

 preserved to demonstrate that point. 



This species is rather similar to S. fusiformis Hutton, from which it 

 differs in the smaller number of its broad axial costae, which number 7 in 

 place of 11 ; by the spiral striation of the posterior part of each whorl, and 

 by the bordered and wavy suture. 



Two specimens only, one of which is nearly complete. Type in the 

 Wanganui Museum. 



Surcula nitens n. sp. (Plate XIX, figs. 3, 15.) 



Shell small, fusiform, 8 mm. by 2 - 5 mm. Spire of 5 convex tapering 

 whorls, half as long again as the aperture. Suture slightly bordered 



