228 Transactions. 



rather wider than the ribs. Both ribs and interstices are crossed by a 

 large number of exceedingly fine spiral lines. 



Although the specimen is extremely fragmentary, the very distinct 

 sculpture justifies its description under a specific name. 



Type in the Wanganui Museum. 



Turbonilla antiqua n. sp. (Plate XV, fig. 10.) 



Shell small, and only the lower four whorls remain in the single speci- 

 men which was found. Length, 8 mm. ; width, \\ mm. The whorls taper 

 very gradually, and the entire shell must have a considerable length 

 relative to its breadth. Whorls nearly flat in outline, but suture rather deep. 

 About twenty-two straight transverse ribs on each whorl, but no spiral 

 sculpture. On the body- whorl the transverse ribs do not extend over the 

 base. Columella with a slight umbilicus. Inner lip thickened at its base 

 with a small fold. Outer lip rather thick. The gradual taper of the whorls 

 and the fold on the columella distinguish this species from those that 

 have been described in New Zealand. 



Type in the Wanganui Museum. 



Dicroloma zelandica n. sp. (Plate XV, fig. 16.) 



Shell of moderate size. Length, 28 mm. ; breadth, 9 mm. Spire of five 

 convex whorls rapidly decreasing in size. Suture shallow. Beak not 

 complete, but apparently about two-thirds the length of the shell. The 

 whorls with numerous slightly raised spiral threads ; there are twelve on 

 the penultimate whorl : these are crossed by numerous low radial lines 

 which are strongly bent backwards in the middle. Body-whorl with spiral 

 striation more distinct, but no radial lines can be distinguished. At the 

 very beginning of the body-whorl a keel starts to develop a little above 

 the crown of the convexity of the whorl. A little farther forward another 

 keel is developed slightly below the crown of the convexity. The two 

 keels are separated by four spiral lines. The two keels rapidly increase 

 in prominence, and where they reach the outer lip they extend into two 

 large wings. The anterior wing is at first directed forward in direct con- 

 tinuation of the keel ; 10 mm. distant from the outer lip it bends through 

 a right angle and, extending for 9 mm., it terminates apparently near the 

 end of the beak. The other keel also ends in a wing, which at first proceeds 

 outward in a continuation of the direction of the keel, then bends gradually 

 downward, and ends about 15 mm. from the penultimate whorl. 



Several specimens have been found, but none of them show the aperture 

 and wings in a good state of preservation. The first one that was found 

 was small, but was worked out of the matrix in a satisfactory state. 

 Unfortunately, it was completely smashed when it was sent through the post 

 to Mr. Suter.' Another specimen (Plate XV, fig. 16). found in 1918, showed 

 the spire fairly complete, but the greater part of the wings is absent, though 

 the impression of them is quite clear in the matrix. The impression has been 

 coloured white in order to show more clearly in the photograph. The beak 

 also was detached, and a small amount of the material has been lost. 

 I think, however, that there is no doubt as to the generic position, and 

 in this Mr. Murdoch agrees with me. The species is probably closely allied 

 to D. myurus Desl. (Cossmann, Essais de Paleoconchologie comparee, vol. 6, 

 p. 85, pi. 6, fig. 1). The genus Dicroloma has not hitherto been definitely 

 recorded from a higher horizon than the Upper Jurassic (Portlandian), 



