146 E. GROVE AND G. STURT ON 



Biddulphia elaborata, n. sp., putting in its place Kittonia elabo- 

 rata, n. sp. 



Biddulphia virgata, n. sp., putting in its place Kittonia virgata, 

 n. sp. 



Aidacodiscus stoschii, Jan., putting in its place Aulacodiscus 

 janischii, n. sp. 



Aulacodiscus beeverice, Johnst., putting in its place Aidacodiscus 

 rattrayii, n. sp. 



Aulacodiscus comber i, Arnott type, putting in its place Aulaco- 

 discus comberi, Arnott, var. oamaruensis. 



Aidacodiscus decorus, Grev., putting in its place Aulacodiscus 

 elegans, n. sp. 



Aulacodiscus notatus, n. sp., putting in its place Aulacodiscus 

 barbadejisis, Ealfs., " Pritch.," p. 939. 



Triceratium cwlatum, Jan., putting in its place Triceratium 

 weissfiogii, n. sp. 



Triceratium cancellatum, Grev., putting in its place Triceratium 

 jiseudo-nervatum, n. sp. 



Triceratium partitum, Grev., putting in its place Triceratium 

 oamaruense, n. sp. 



Auliscus barbadensis, Grev. var., putting in its place Auliscus 

 lineatus, n. sp. 



In our notice of Triceratium grande, Briglitwell (" J. Q. M. C," 

 Ser. ii, Vol. ii, p. 326), we gave as a synonym T. favus, var. 

 maxima, Grun., but not having seen authentic specimens of the 

 latter, we do not feel assured of the identity of the two forms, and 

 desire to note the large convex form so abundant in this deposit 

 simply as T. grande. 



We desire to record that since our first description of Pseudo- 

 rutilaria monile, specimens have occurred in which the number of 

 cells on either side of the centre is equal ; also specimens in which 

 the number on one side exceeds that on the other by more than 

 one. 



We also request our readers not to attach too much importance 

 to the statements in the earlier parts of this paper as to the rela- 

 tive abundance of the various species. Subsequent examinations 

 have shown us that the relative numbers of the species vary in 

 every different piece of material, even from the same lump. One 

 Diatom, however — Stephanopyxis valida, Grun. — asserts its pre- 

 eminence in number in every sample we have examined. 



