Shell-hed imdevlylng Volea-nic Tuff. 7 



favour of separating this and similar forms with smooth shells and 

 uncrenulated margins, under the generic term Marcia."!- 



Practically all the valves of this species found in the fossil bed 

 are deeper than in the living form, although occasionally one may 

 meet with similar shells of recent origin. 



This species was fairly common. 



Fam. Tellinidae. 

 Genus Tel I ilia, Linne 



Tellina deltoidalis, Lamarck. 



Tellina delfoidalis, Lamarck, 1818, Anim. sans Vert., vol. 

 v., p. 532. Pritchard and Gatliff, 1903, Proc. R. Soc. 

 Vict., vol. XVL (N.S.), pt. L,p. 115. Suter, 1913, 

 Manual of N. Zealand Mollusca, p. 948 (Atlas), pi. 

 LIX.,fig. 11. 

 Several fragments of this common shore-living species occurred 

 in the present deposit. 



Fam. PSAMMOBIIDAE. 



Genus Soletellina, Blainville. 

 Soletellina biradiata. Wood sp. 



Solen biradiata, Wood, 1815, General Conch, p. 135, pL 



XXXIII., fig. 1. 

 Soletellina biradiata. Wood sp., Pritchard and Gatliff, 1903. 

 Proc. R. Soc. Vict., vol. XVI. (N.S.), pt. I., p. 114. 

 Suter, 1913, Manual of N. Zealand Mollusca, p. 1083 

 (Atlas), pi. LXII.,fig. 13. 

 Numerous specimens of the above species, mostly fragmentary, 

 occur here. 



Fam. Mactridae. 

 Genus Spisula, Gray. 



Spisula trigonella, Lamarck sp. 



Mactra trigonella , Lamarck, 1818, Anim. sans Vert., vol. V., 



p. 479. 

 Gnathodon parvum. Petit, 1853, Journ. de Conch., vol. IV,, 



p. 358, pi. XIII., figs. 9, 10. 



1 MiUl. Proc. U. S. Niit. Has., vol. xxvi., 1903, p. 335. 



Jukes-Biowiie. Proc. Malae. Soc. Loud. vol. viii., 1909, ]1. 23: 



A. .OS ^ <^ 



,jjIlIBRARYJ33 



