REVIEWS AND CRITICISMS. 41 



Sauvageau, Kuckuck, and Rosenvinge have done much within the 

 past few years towards clearing up the doubtful old species and 

 distinguishing new forms, but there is no reference to them in this 

 paper, Sauvageau's work is especially important in comparison ; 

 most of it has been done in the Bay of Biscay; and, though at 

 first sight it would seem unlikely that there was much in common 

 between these localities, in reality many species occur in both. E. 

 Mitchellce is common on the French Coast, as well as on the 

 Atlantic Coast of the United States ; perhaps, however, this should 

 be considered as a cosmopolitan species; certainly it should be if E. 

 Indicus Sender is a synonym, as Mr, Saunders claims. But there 

 are two other Ectocarpus species, not included in this paper, which 

 have been recently found in Southern California, and which are 

 found also on the French coast, though not on the east coast of 

 America. 



In regard to individual species, some comments may be made. 

 Phycocelis reptans (Crouan) Kjellman is properly described as 

 having erect filaments unbranched, but in PI. XII, fig, 10, we find 

 one filament with an abundance of short branches, P. foecunda 

 Stroemf. is described as having uniseriate plurilocular sporangia; 

 this does not agree with the type, but with var. seriata Reinke. * 

 But there is a possibility that the plant observed by Mr. Saunders 

 may be neither type nor variety; for the figure would pass very 

 well for Myrionenia vulgare Thuret. 



Ectocarptts chitonicolus in PL XV, Figs. 2, 3, and 4, has pluri- 

 locular sporangia so different in appearance as almost to suggest that 

 there was more than one species concerned; as the text contains 

 no information in regard to figures other than is given by the plates 

 themselves, we can only conjecture as to the causes of the difference. 

 May it not be possible that we have here the two forms of pluri- 

 locular sporangia described by Sauvageau? f In that case Fig. 2 

 would represent the megasporangia; Fig. 4, the meiosporangia ; 

 Fig. 3, however, seems abnormal. The author reports no observa- 

 tions as to the formation and emission of the zoospores; it would 



*Eeinke, Atlas Deutscher Meeresalgen, PI. XVI, 1889. 

 t Sauvageau, Sur I'Ectocarpus virescens, Jour, de Bot., Vol. X, p. 17, 

 1896. 



