266 Transactions. 



Cymbiola masefieldi n. sp. (Plate XVIII, figs. 12, 12a.) 



Shell of moderate size, 21 mm. by 8 mm. The type specimen, however, 

 is not quite complete: if it were, the length would probably be 25mm. 

 Shape fusiform. Spire of 5 whorls separated by a deep suture. Each whorl 

 with a convex outline rising steeply from the posterior suture but sloping 

 gently anteriorly. Body - whorl about two - thirds of the total length. 

 Aperture about one-third of the length of the shell, narrowly oval, extended 

 anteriorly into a short canal. Columella without callosity but with two 

 distinct plaits. Ornamentation slight. Two or three narrow spiral grooves 

 on the posterior portion of each whorl. Base with about 12 spiral grooves 

 filling all the space between the base of the aperture and the apex of the 

 canal. Growth-lines are distinct on all the whorls. 



Three specimens, in rather an imperfect condition. Type in the Wanga- 

 nui Museum. 



Cymbiola nitens n. sp. (Plate XVIII, figs. 6, 6«.) 



Shell of moderate size, 26 mm. by 8 mm. Spire of moderate length, 

 consisting of 5 or 6 whorls. Each whorl slightly convex, with a steep slope 

 behind. Body-whorl about two-thirds the length of the shell, aperture 

 about one-third. Aperture narrow, extended anteriorly into a short canal. 

 Columella with no callus but with 2 strong folds of almost equal size. 

 Ornamentation : Surface smooth and polished. A few spiral grooves in 

 each whorl : these are deeper and more pronounced near the upper part of 

 each whorl. Body-whorl with 2 of these grooves near its posterior end, 

 with 13 grooves near its anterior end, where it is prolonged into a short 

 canal. Growth-lines distinct. 



This species is very closely related to 0. masefieldi, but it has more 

 numerous but less distinct spiral grooves, and the outline of the whorls is 

 less convex. 



Three specimens only, one of which is in good condition. Type in the 

 Wanganui Museum. 



Cymbiola calcar n. sp. (Plate XVIII, figs. 7, la.) 



Shell small, 9 mm. by 4 mm. Shape ovate. Spire rather short, of 

 7 whorls, rapidly decreasing : three of these constitute the protoconch. 

 Body- whorl distinctly longer than the rest of the shell. Aperture nearly 

 one-half the length of the shell, ovate. Outer lip not preserved ; columella 

 without callosity, but with 2 sharp folds, the posterior of which is sharper 

 than the anterior and more oblique than it. A well-developed but short 

 anterior canal. Whorls slightly convex, steep on the posterior side but 

 gently sloping on the anterior side. All the whorls have narrow spiral 

 grooves. Body-whorl with 6 strong distant narrow ridges on the anterior 

 part. Lines of growth distinct. 



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



Mitrella inconspicua n. sp. (Plate XIX, figs. 9, 13.) 



Shell minute, 4 mm. by 1"5 mm., shortly fusiform. Spire of 6 whorls 

 almost flat in profile. Aperture considerably less than one-half the length 

 of the shell. Outer lip starting at a sharp angle, thick at first, but becoming 

 thin towards the short anterior canal. Columella with 6 distinct spiral 

 lines extending outward over the body-whorl. Protoconch of 3 smooth 

 whorls. Ornamentation : Whorls almost smooth, though with obscure 

 irregular radial lines. Suture impressed. 



