CEEITHIUM, 227 



Cerithium hectori, nom. mut. 



1873. Cerithium nodulosum, Hutton, Cat. Tert. Foss. N.Z. p. 12 {non 

 Brugiiiere) . 



Shell turrctcd ; whorls flattened, ten to eleven in number, 

 having a spiral row of large dentate, subspinose tubercles, about 

 eight per whorl, situated medially on the body-whorl, but more 

 towards the suture anteriorly, in the whorls of the spire ; body- 

 whorl short, keeled, with two spiral ridges in front of the 

 tubercles ; aperture quadrate ; outer margin thin ; columella 

 excavated ; anterior canal short, slightly oblique. 



The specific name is now altered for the reason indicated in the 

 synonymy. 



Dimensions. — Length 46 mm. ; breadth 15 mm. 



Form, and Loc. — Eocene : Broken River, New Zealand. 



G. 9601. Two examples, one of which is evidently more 

 perfect than Hutton was acquainted with, since, although not 

 complete, the aperture is preserved. Sir James Hector Coll. 



Genus COLINA, H. and A. Adams. 



[Gen. Rec. Moll. vol. i. 1854, p. 286.] 



Aperture dilated ; columella plicated ; canal short, slightly 

 twisted ; inner margin detached. 

 Type. — Cerithium macrostoma, Hinds. 



Colina huttoni, Cossmann. 



1873. Cerithium cancellatum, Hutton, Cat. Tert. Moll. N.Z. p. 12 {mn 



Lamarck, nee Bronn, nee Lea). 

 1893. Cerithium eancellalum, Hutton, Linn. Soc. N.S.W., Macleay Mem. 



Vol. p. 59, pi. vii. fig. 55. 

 1895. Colina huttoni, Cossmann, Feuille Jeunes Natur. No. 299, p. 174. 



Shell small, turreted ; protoconch smooth, minute ; whorls in 

 the brephic stage longitudinally ribbed at the beginning, and 

 gradually becoming cancellate with growth ; the cancellation 

 obtains to the body-whorl, the threads being regularly spaced; 

 longitudinal threads to the number of twenty-three or twenty-four 



