NEVVTONIELLA. 229 



Batillaria pomahakensis, nom. mut. 



[Plate VII. Fig. 4.] 



1873. Cerithium ricgatum, Hutton, Cat. Tert. Moll. N.Z. p. 11 («o» Mart., 

 nee Cpr., nee Desh.). 



Shell tiirreted ; whorls to the number of nine or ten, plicate and 

 nodose at the periphery, spirally striated, body-whorl large and 

 having two prominent spiral keels in front of the median row of 

 tubercles, lines of growth well marked leading to rugosities, 

 sinuous and deeply cut in towards the middle ; aperture sub- 

 orbicular; outer margin slightly channelled posteriorly; inner 

 margin reflected, covered by a thin plate of enamel, ridged 

 posteriorly ; columella straight, slightly arched ; anterior canal 

 very short. 



The specific name rugatum having been used by several authors 

 for divers forms of Cerithium, which differ from the present 

 species, as above indicated, a new name is here suggested. 



Dimensions. — Length 45 mm. ; breadth 17'5 mm. ; length of 

 aperture 13 mm. 



Form, and Loc. — Miocene : Pomahaka, Otago, New Zealand. 



G. 9634. Several examples of the adult. &ir James Hector Coll. 



Genus NEWTONIELLA, Cossmann. 

 [Mem. Soc. Hoy, Malac. Belg. t. xxviii. 1893, p. 18.] 



Lovenella, G. 0. Sars, Norges Arktiske Fauna, 1878, p. 187, 



pi. xiii. fig. 5 («ow Hincks, 1868). 

 Cerithiella, Verrill, Trans. Connecticut Acad. vol. v. 1882, p. 522 



{no)i Morris and Lycett, 1850). 

 Newtonia, Cossmann, Ann. Geol. Univ. t. viii. 1892, p, 721 {non 



Schlegel, 1866). 



Shell subulate, cancellate ; spire sharp ; columella not plicate 

 in the middle ; canal strongly curved backwards, bordered by 

 a conspicuous twist of the columella. 



The columella is too much twisted, and the anterior canal is 

 too long to enable Newtoniella to be confounded with Cerithiopsis, 



