1913- ^o. 8. 



JAPANESE DIATOMS. 



27 



Grunow reported <S'. turyida Ralfs from Yeddo Bay. Japan (Diat. 

 Franz Josephs Land p qo). But he remarked that in his specimens the 

 meshes were smaller aloni; the girdle-line {3 — 6 in 10 u) than on the 

 valval surface (3 — 4 in 10 //)■ This is not a character of R ai. ks' species, 

 but of S. Pahneriuna (Grey.). We ha\e never seen a typical form of 

 S. turgida Rai.ks (= S. fayris Grev.) in the Japanese material in our 

 possession. 



Loc, »In mari japonico« (Castuacank); Shinojima, Shirahama, Goza 

 (Okamira); Alisaki (Okamira, Ykndo); Misumi (Yendo) Yenoshima, 

 Akashi Channel (SciiRtinKi;); Yeddo Bay (Giuxow); Hong-Kong (Grevillk). 



Stpphanopyxis nipponica Gran et Yendo, sp. nov. 

 = Steplimx/pyxis tarns Yendo. Discoloured water of Volcano 

 Bay. p. 28. 191 1 (in Japanese). 

 S. Frustulis cylindraceis, 27 — SS a diam., didmeiro 2 — tplo (<)iif/i<j- 

 rilms, valvix snpcrne JiemispJiaericw, acaleis S — 12 continuatis nnnquam 

 articulatis, areolis hexagonalihus 4 — .5^/2 in 10 u, longitudinaliter vel 

 oblique seriatis vel nonnunquam irregulariter dispositis. 



Fig. 16. 



a. Typical torm of frustules. X 650. 



b. Frustules with aberrant form of meshes on 



one of the valves. X 450. 



c. A chain of frustules just after the division. 



X 450. The meshes not shown in the figure. 



