1913- ^O- S- 



JAPANESE DIATOMS. 



23 



Chaetoceras debile Clevk. 



Cleve: 1894, p. 13, PI. I, fig. 2. — Oestuup: 1895, p. 456, 

 PI. 7, fig. 89. — Gran: 1906, p. 92, fig. 117. — Schröder: 1906, 

 p. 337. — üka.mura: 1907, p. 100, PI. 4, figs. 76, j-j. — Meunier 

 1910, p. 242, PI. XXVII. figs. 19—23. — Yendo: 191t, p. 26. 

 = C. rermicuhis Sciifrr: 1895, p. 39, fig. 70a — c. 

 We have never seen any spore in the Japanese specimens. Oka- 

 mura'.'? information is also based on a sterile specimen. Some doubt may 

 therefore be entertained as to the adequacy of the determination. The 

 specimens from Volcano Ra\', however, coincide fairly well in many points 

 with those from the Atlantic. 



Loc. Off the Kuriles (Okamuka), Volcano Bay (Yendo). Enoshima 



(ScHR()DER). 



Fig. 13. Chaetoceras debile Cleve. 



a. A chain ot broad, compressed frustules. X 360. 



b. A chain of smaller frustules; the chain is coiled 



and twisted. X 360. 

 Both from fresh material. 



Sect. 14. Fiircellata Osten f. 



Chaetoceras scolopendra Ci.kve. 



Cleve: 1896b, p. 30, (îg. 4. — Gran: 1897a, p. 24, PI. 4. figs. 

 52. 53- — Do-: 1900b. p. 122, Taf. 9, figs. 23, 24. — Ostenfeld 

 1 90 1, p. 293. — Gran: 1906, p. 93, fig. 119. — Schröder: 1906, 

 P- 337- 

 Loc. Volcano Bay; Otaru Bay (Yendo). Enoshima (Schröder). 



