! I THE BOTANWAL MAGAZINE. [vol. xxi. No. 244. 



11 by 22 ju in thickness and breadth respectively. From that 

 figure it will be seen that all the horns stand in sagittal-longi- 

 tudinal plane. 



Section 4. Cylindrica Ostf. 



11. C. teres Cleve ? PI. IV, Figs. 53, 54. 

 Cleve Treatise, 1897 a, p. 22, t. 2, f. 10 ? ; Gran., Diat., 



1905, p. 76, Fig. 91 ? 



The specimen before us is too imperfect to determine its 

 specific name. 



Loc. in Jap. : Tateyama in Prov. Boshyu (June, 2, 1906). 



The specimen figured measures 57.5 // in breadth and 45 /i 

 in thickness. 



Section 5. Compressa Ostf. 



12. C. compressum Lauder. PL III, Figs. 8—11. 

 Lauder, Hongkong, 1864, p. 78, PI. VIII, Fig. 6 ; Cleve, 



Java, 1873, p. 78 ; Ostf, Mar. PI. Diat, 1902, p. 234, Fig. 12. 

 — C. Kcllcri Brun (after Ostf. 1. c.).— Schroder, Warm. Meere, 

 190(3, p. 350. 



Loe. in Jap. : Tateyama in the Prov. Boshyu (June, 2, 

 1906) ; Cape Goza in Prov. Shima (Aug, 2, 1904). 



Fndocysts are formed almost in the middle part of cells and 

 have both valves almost equal and smooth. 



In 1901 Schmidt for the first time described Richelia intra- 

 cellularis as endoparasite in the cells of Rhizosolenia styliformis. x) 

 In the sea of the Pacific side of this country I often met with 

 that parasite in the cells of R. styliformis (I can not state for 

 the present whether or not the parasite is always found in one 

 and same species). 



While pursuing this study I found another case with respect 

 to the parasitism of this filamentous alga. It is not with 

 "Rhizosolenia but with Clueloccras compressum Lauder. I met 



Richelia iniracellvlaris Scbm. in Ostf. and Schm., 1901, Adenhugten, p. 146, 

 r. 'J; also in Bedwigia, Bd. XL, 1901, p. 112 with 6gure. 



