230 Transactions. 



Volutoderma zelandica ii. .sp. (Plate XVII, figs, -i, 5.) 



Shell small. Length, 12 mm. ; width, 5 mm. Spire incomplete ; por- 

 tions of the first and jsecond wiiorls alone remain. Whorls rather rapidly 

 decreasing. Aperture prolonged anteriorly into a moderatel}' long siphon 

 which is bent backward towards its extremity. Each whorl with a distinct 

 ridge bordering the posterior suture. Six prominent costae on each whorl, 

 which are most pronounced near the keel ; they extend forward to the 

 anterior suture, but do not reach the posterior one. Five small spiral ridges 

 on each whorl crossed by numerous growth -lines. On the body- whorl the 

 costae are little more than tubercles on the carina. The growth-lines are 

 numerous and distinct, but spiral lines are visible near the end of the siphon 

 only. Columella with one prominent plait. The growth-lines indicate that 

 there is a moderately deej:) sinus between the suture and the keel. The 

 aperture is too imperfect in the specimens to show this feature. I am 

 indebted to the late Mr. Suter for provisionally classifying this species. 

 Two specimens, somewhat imperfect, in the Wanganui Museum. 



Marginalia aveniformis n. sp. (Plate XV, fig. 8.) 



Shell small, 6 mm. b}' 2J mm., narrowly oval. Spire of three whorls, 

 rapidly decreasing. Aperture about two-thirds the length of the shell. 

 Spire short ; whorls convex in outline, but suture only slightly marked. 

 Surface perfectly smooth and polished. Aperture narrow, with a slight 

 anterior canal. Columella with four narrow folds, the two posterior of 

 which are nearly at righIP angles to the columella, but the two anterior ones 

 are highly oblitj[ue. Outer lip swollen, and furnished with a number of 

 denticles on its inner margin. 



A single specimen, in good condition. The spire is longer than that of 

 other New Zealand species. 



Type in the Wanganui Museum. 



Turris politus ii. sp. (Plate XVII. fig. 9.) 



Shell small, 10 mm. by 4 mm., with a polished surface. Spire consists 

 of six strongly keeled whorls. Seventeen small rounded tubercles on the 

 carina of each whorl. Growth-lines extend upwards from the tubercles, 

 and where they intersect the raised anterior border of the suture there is 

 another series of much smaller tubercles. There are no spiral markings on 

 the portion of the whorl between the posterior suture and the keel. On the 

 keel there is a small spiral furrow which intersects all the tubercles. There 

 are four other small furrows between the keel and the anterior suture. On 

 the body-whorl the furrows in front of the keel are more numerous. 

 Aperture imperfectly preserved. 



Two specimens, in fair condition, but the aperture is imperfect. Suter 

 remarks that this species is closely related to T. compUcatus Suter. The 

 species, however, is considerably smaller, the tubercles are much less 

 prominent, and the spiral ornamentation in front of the carina is distinct. 



Type in the Wanganui Museum. 



Turris margaritatus n. sp. (Plate XVII, fig. 2.) 



Shell small. Length, 15 mm. ; width, 5 mm. Spire consists of six 

 strongly-keeled whorls. x-Vperture less than half the length of the shell. 

 The keel has eighteen bead-like tubercles on each whorl, but rather 

 flattened in front. The whole whorl is finely striated spirally. Body- 



