Hutton. — On new Tertiary Shells. 319 



Length '18 inch. 



Locality. Petane. 



Aclis costellata. PL xviii., fig. 14. 



Shell minute, subulate. Whorls 6, rounded ; the first two smooth and 

 polished, the rest spirally grooved. Spire whorls with the two posterior 

 spiral grooves deeper and broader than the others, and the rib between 

 them raised higher ; crossed by delicate longitudinal plications. Body 

 whorl like those of the spire ; the whole of the base very finely spirally 

 grooved. Suture well marked. Aperture ovate, less than half the length 

 of the shell ; columella arched ; umbilicus covered. 



Length, '13 inch. 



Locality. Wanganui. 



Odostomia sulcata. PL xviii., fig 15. 



Shell large, ovato-elongate, spirally grooved, the spire slightly gradated. 

 Whorls 8, flattened ; those of the spire with 5 to 7 narrow grooves crossed 

 by longitudinal growth-lines ; body whorl with 18 to 20 grooves, the anterior 

 of which are sometimes closer than the posterior. Suture impressed. 

 Aperture ovate, pointed behind ; columella with a single, posterior, oblique 

 fold, almost or quite covering the umbilicus. 



Length, *62 to 1-0 inch ; breadth, '34 to -43 inch. 



Locality. Wanganui. 



The form of this shell is very variable ; the length is from 2 to 2J times 

 the breadth. 



Odostomia georgiana. PI. xviii., fig 16. 

 Shell rather elongated, shining. Whorls 10, flattened, polished, irregu- 

 larly longitudinally marked, but without any spiral sculpture ; body 

 whorl very obtusely keeled. Suture impressed. Aperture oval, pointed 

 behind ; columella with a single deep, posterior, oblique fold, nearly or 

 quite covering the umbilicus. 



Length, *58 inch ; breadth, '22 inch. 



Locality. Wanganui. 



Named after Mr S. H. Drew's son, an indefatigable collector. 

 Odostomia (Parthenia) plicata. PL xviii., fig 17. 



Shell minute, ovato-elongated, longitudinally plicated. Whorls 6, 

 flattened, irregularly longitudinally, rather strongly, plicated on the posterior 

 half only ; the anterior half of the body whorl smooth ; the whole shell 

 faintly spirally striated. Suture impressed. Aperture ovate ; columella 

 with a single, rather strong, fold ; the umbilicus covered. 



Length, '12 inch. 



Locality. Wanganui and Petane. 



