10 K. OKAMURA. 



45. B. (Odontella) reticulata Roper, var. inermis Castracane Challenger 

 p. 102, PI. XXVI, f. 9. PL XII, fig. 45. 



Loc: Shirahama (Prov. Boshyu). 

 Area : Philippine Islands. 



46. B. {Odontella) longicruris Grev. var. Schmidt Atlas Taf. 118, f. 10. 



PI. XII, fig. 46. 

 Loe.: Tokyo Bay, Shirahama (Prov. Boshyu), Prov. Tosa, Yoko- 

 hama (Griindl.) 

 Area : Pacific Ocean. 



47. B. {Odontella) sinensis Grev. Ostf. u. Schmidt PI. Red Sea p. 152, 



f. 6 ; A. Schmidt Atlas t. 122, f. 22-24 ; Gran in Brandt u. Apst. 



Nord. PL p. 107, f. 139 ; Ostf. in Schmidt Fl. Koh Chang p. 243, f. 



21. PL XII, fig. 47. 



Loc: Tokyo Bay and widely known. 



Area : Red Sea, Malay Archipelago, South China Sea, Norway. 



Istlimia Ag. 



48. I. enervis Ehrenb. Kuetz. Bacill. p. 137, t. 19, f. 4; W. Smith. Brit. 

 Diat. II, p. 52, t. 48 ; Pritch. Inf. p. 851, t. 10, f. 183 ; A. Schm. 

 Atlas t. 136, f. 1, 3, 6, 7 ; Schutt in Engl. u. Prantl. Pflanzenfam. 

 Bacill. p. 95, f. 164. PL XII, fig. 48. 



Loc. : Shirahama (Prov. Boshyu). 

 Area : Atlantic, Adriatic Sea. 



Cerataulina Peragallo. 



49. C. compacta Ostf. in Ostf. and Schmidt PL f. Red Sea p. 153, fig. 7. 



PL XII, fig. 49. 

 Loc : Prov. Tosa, Gulf Kojima (Prov. Bizen). 

 Area : Red Sea. 



Heniiatiliis Ehrenb. 



50. H. Heihergii Cleve Diat. Java p. 6, PL I, f. 4. PL XIII, fig. 50. 



Loc: Gulf Kojima (Prov. Bizen), Prov. Tosa, Cape Goza (Prov. 



Shima). 

 Area : Malay Archipelago. 



liutilaria Grev. 



51. R. edentula Castr. Challenger p. 92, PL XVIII, f. 14. 



PL XIII, fig. 51. 

 Loc : Prov. Tosa. 

 Area : Philippine Islands. 



Our specimen measures 102 p. in length, 17.5 p. broad in median 

 pertion and 5 ju in arms. 



