387 



Some critical remarks by Herr A. Gruxow ox the Oamaru 

 Diatom papers of Messrs. Grove and Sturt. 



Translated by G. C. Karop, with Annotations by E. Grove. 



Introduction. 



The papers on the fossil marine Diatomaceous deposit of 

 Oamaru, New Zealand, which appeared in this Journal, Ser. II., 

 Vol. ii., p. 321, and Ser. II., Vol. iii., pp. 7, 63, and 131, by 

 Messrs. Grove and Sturt, having been reviewed by Herr 

 Grunow at considerable length in the " Botanisches Central- 

 blatt," No. 31, 1887, and Nos. 15, 16, 1888, it has been thought 

 desirable to put before the members the following summary of 

 such of Herr Grunow's remarks in the " Centralblatt " (as well 

 as in correspondence with Mr. Grove), as have reference to 

 changes or modifications in the names given to any of the forms 

 by the authors. 



Summary. 



Pseudo-rutilaria monile, Gr. and St. Is not at all related to 

 Rutilaria, but closely allied to several species of Hemiaulus. 



Cerataulus subangulatus, Gr. and St. This very peculiar 

 Triceratium-like form can hardly be classed with Cerataulus. 

 [The texture of the valve, form of processes, and presence of 

 spines (which are occasionally forked like those of G. hirgidus), 

 induced the authors to place this in Cerataulus rather than add 

 to the number of existing Genera. The subangular outline is 

 not of specific importance. — TJ. G.~\ 



Triceratium jparallelum var. gibbosa, Gr. and St. Agrees better 

 with the nearly related Tr. disciforme, Grev. [This form 

 agrees more closely with the figures of Tr. parallelum forma 

 trigona, in Plates LXXV. and LXXVI. of " Schmidt's Atlas," 

 than with the figure of Tr. disciforme, Grev., in PI. LXXV- 

 This and similar angular forms are now rightly placed in 

 Stictodiscus, and in the Atlas, PI. CXXXL, Fig. 9, is an excel- 

 lent drawing of this Oamaru form under the title of S.parallelus, 



