Bartrum. — New Fosxil MolJnsca. 99 



Siphonalia kawaensis n. sp. (Plate VII, figs. 9 and 10.) 



Three specimens in a moderately good state of preservation ; that 

 chosen as holotype is incomplete at the apex of the spire, but shows the 

 aperture and ornamentation well. 



Shell oval, of medium size. Spire about half height of shell, angle 55°. 

 Whorls about 8, gradually increasing. Protoconch (shown by a paratype), 

 2 J smooth whorls. 



In ornamentation identical with the preceding species, S. jnopenodosa, 

 except that the spiral band of nodules on the base of the body-whorl is less 

 distinct. Aperture oval, distinctly notched above, and passing below into 

 a broad short greatly reflected oblique anterior canal, truncated at the 

 base. Columella arcuate above, oblique below. Outer lip thin, sharply 

 angled at upper carina of body-whorl, less so at lower one, somewhat 

 crenulate within. Inner lip very broadly spread over body-whorl as a 

 thick callosity, which is produced into a most conspicuous strong tooth- 

 like process at about the middle height of aperture, just below the band of 

 nodules on the base. 



Height, 43 mm. ; diameter, 25 mm. 



Holotype and two paratypes in author's collection. 



Locality : Coast near Kawa Creek, south of Waikato River, Auckland. 

 Collected by Bartrum, 1917. 



Spisula aequilateralis gilberti n. var. (Plate VII, fi.g. 11.) 



A very plentiful pelecypod in the Kawa bed, but difficult to collect 

 perfect on account of friability both of fossils and containing beds. 

 Unfortunately the author's specimens were crushed in transit by post 

 from the late Mr. Suter, who examined them, and are not therefore as 

 desirable types as might be obtained. 



Shell moderately large, solid, with very heavy hinge with normal 

 dentition and characters. In ornamentation the variety agrees with the 

 normal species, the radial sculpture being perhaps closer and more distinct. 

 In outline and contour there are constant differences. The variety is 

 laterally more compressed, being less globose, and is flattened anteriorly 

 on lower half of valve. The posterior dorsal margin descends rapidly 

 from near the umbo and is straight, the dorsal region much flattened. The 

 anterior dorsal area also is somewhat flatter than in the normal species. 



Length, 74 mm. ; height, 59 mm. ; half diameter, 17-5 mm. 



Holotype and imperfect paratype in author's collection. 



Locality : West coast, near Kawa Creek, south of Waikato River, 

 Auckland. Collected by Bartrum, 1917. 



Terebra benesulcata n. sp. (Plate VII, fig. 12.) 



Small, cylindrico-conical shell, with sharp elongate spire. Whorls 7 in 

 the incomplete holotype, rather flattish, gradually increasing ; suture 

 rather deep. Spire about 4 times height of aperture. Protoconch absent. 



Growth-lines crowded, rather sinuous, specially distinct on penultimate 

 and body whorls. Two spiral rows of strong rounded tubercles, the lower 

 slightly the stronger, with a moderately deep broad sulcus between them, 

 characterize the whorls. Ten tubercles on the penultimate whorl ; those 

 of the lower row are continued as low costae to the anterior suture, but on 

 the body-whorl die out before reaching the basal portion. No other spiral 

 sculpture. 

 4* 



