55 

 Kuetzing does not seem to have seen the Bacillarian at ali for he 

 copies the figures of Montagne and Ehrenberg. Ehrenberg founded 

 the genus to receive this form in 1840. 



It also seems to have been described as Cyclotella ligustica, F. 

 T. K. 1844, Bac. p. 5o from the Gulf of Genoa, Cyclotella maxima 

 F. T. K. 1844, Bac. p. 5o from the Coast of Chili and Perù. This 

 is first described as in Herb. Berol. 1842. Also as Pododiscus jamai- 

 censis, F. T. K. 1844, Bac. p. 5i, Taf. 21, fig. VII on Enteromorpha 

 ramulosa at Jamaica. The following forms can also be given as sy- 

 nonyms. 



Hyalodiscus Franhlinii C. G. E. 



— subtilis J. W. B. 



— laevis C. G. E. 



— patagonicus C. G. E. 



— Whitneyi C. G. E. 

 Podosira hormoides F. T. K. 



— nummuloides C. G. E. 

 Melosira hormoides F. C. M. 

 Hyalodiscus stelliger J. W. B. 

 Podosira maculata W. S. 

 Craspedodiscus stella C. G. E. 

 Melosira nummuloides C. G. E. 



Podosira {hormoides Mont. var. ?) minima A. G. 



— Montagnei var. minor A. G. 

 Melosira globifera V. H. H. 

 Rosaria globifera C. 



Podosira dubia (Kùtz.) A. G. 

 Melosira dubia F. T. K. 

 Hyalodiscus scoticus (Kùtz.) A. G. 

 Podosira (adriatica var.?) delicatula A. G. 



— adriatica (Kùtz.) A. G. 

 Pyxidicula adriatica F. T. K. 

 Podosira Febigeri A. G. 

 Hyalodiscus californicus J. W. B. 



— cervinus T. B. 

 Coscinodiscus cervinus J. R. 



The trouble has been that most observers studied and named 



