LOO THE BOTANICAL MAGAZINE. . [Vol. xxi. n* 24* 



According to Ostenfeld's view (Mar. PI. Diat., p. 239) I have 

 here referred our plant to C. secundum. I do not know whether 

 all the plants having the name of C. secundum Cleve is identical 

 with C. curvisetum Cleve mentioned in Gran's Diatomaceae p. 91. 



Loc. in Jap. : Prov. Boshyu (Ma3% 1906). 



Breadth and thickness measure 11 fi and 7.5/* respectively 

 in the specimens represented in Figs. 49, 51 and 52 ; and in 

 Fig. 50, breadth, 25//. 



26. C. debile Cleve. PL IV, Figs. 76, 77. 



Gran, Diat., 1905, p. 92, Fig. 117 a-b.—C. vermiculus 

 Schutt, Chaet. u. Perag., 1895, p. 39, f. 7 a-c. 



Loc. in Jap. : 40 miles off the coast of Shinshirijima (Kurile). 



Breadth measures 20—27 ,u in the specimen shown in Fig. 

 76 and thickness, 7.5 p. in that figured in Fig. 77. 



Genus II. Peragallia Schutt. 



1. P. meridiana Schutt. PL VI, Fig. 65. 



Schutt, Chaet. u. Perag., 1895, p. 48, Taf. 5, Fig. 28, a-b. 

 —P. tropica Schutt in Engler u. Prantl, Pflanzenfam, Bacil- 

 lariacea?, p. 86, Fig. 142. 



In our specimens, cells are united into a straight chain 

 instead of being solitary as it is shown by Schutt, and have 

 lanceolate foramen. Chromatophores are small and fusiform in 

 shape, densely arranged in somewhat radiate manner. 



Loc. in Jap. : Prov. Tosa ; Shirahama in the Prov. Boshyu 

 (May, 1906). 



