20 H. H. GRAN AND K. YENDO. M.-N. Kl. 



II. On Stephanopyxis. 



The number of Sfephanopyjis reported from Japan and its adjacent 

 waters amounts to fifteen in all. Of these, ten are fossil and have nothing 

 to do with the living forms. The remaining five are as follows: — 



Steplianopyxis Campana Castr. (Castracaxe, Okamura). 



S. Palmeriana Grun. (Greville, Schröder). 



S. Palmeriana var. javanica Grun. (Okamura). 



S. iuryida Ralfs (Gunow, Yendo). 



S. turris Grey. (Yendo). 

 We have made a close study of the information given concerning these 

 forms, comparing it with the specimens from Japan. The conclusion we 

 have arrived at is that the first four are based on one and the same 

 species, and the last, determined as S. turgida Ralfs, is a new species. 

 The details are given below. 



Stephanopyxis Palmeriana (Grev.) Grun. 



Diatoms Franz Josephs Land. p. 90. — Schröder: Phytopl. 

 warm. Meer. p. 338, p. 341. — Otto Müller; Kammern u. 

 Poren in d. Zellwand d. Bacill. IV. p. 196, fig. i. 



= Creswellia Palmeriana Grev. Trans. Mic. Soc. i865_ 

 PI. I, fig. 9. 



= Stephanopyxis tivryida Grun. Diatom. Franz Josephs Land 

 p. 90. — Yendo: Contr. to Study of Phytopl. Japan p. 38^ fig. 4 

 (in Japanese). 



= StepJianopyxis Palmeriana var. jacatiica Grun. 1. c. p. 90. 

 — ScH>riDT: Atlas Diatom. Taf. 130. fig. 44. — Okamura: 

 (erroneously calling it va.ir. japonica Grun.) Littor. Diat. Jap. p. 1. 

 PI. VIII, fig. I. 



= Sfephanojjyxis Campana Castr. Challenger Diat. p. 88. 

 PI. 19, fig. 14. — Okamura: 1. c, p. 2, PI. VIII, fig. 2. 

 StepJianopyxis Campana Castr. is nothing but a smaller form of 

 8. Palmeriana var. javanica Grun., as Grunow has already stated in 

 Schmidt's Atlas, Taf. 130. But Grunow's variety itself is also a smaller 

 form of S. Palmeriana (Grev.) Grun. Greville's original species has 

 been described from a fairly large form, and Grunow therefore distin- 

 guished its smaller form, as he habitually does, giving it a rank as a 

 variety. Our material contains all transitions between Greville's large 

 cylindrical form and Castracane's narrow elliptical ones. 



