may, 1907.] OKAMUEA.—CHAETO. & PERAGAL. OF JAPAN. 99 



is arcuate with numerous longer spines, and the secundary valve 

 is humped with shorter spines on the hump. 



Loc. in Jap. : Cape Goza in Prov. Shima (Aug., 3, 1904). 



The specimens figured measure : in Fig. 40, breadth and 

 length, 10 p. and 10-12 fx ; in Fig. 43, 27.5 (i and 10-12 p re- 

 spectively. 



Section 10. Diversa Ostf. 



22. C. lseve Leud.— Fortm. PI. Ill, Figs. 23-24. 

 Ostf., Mar. PL Diat., 1902, p. 237, Fig. 16 ; Id. Faeroes, 



1903, p. 576 ; Schroder, 1906, Warm. Meere, p. 351. 



Loc. in Jap. : Cape Goza in Prov. Shima (Aug., 3, 1904). 



Breadth as well as length of the cell in the specimen repre- 

 sented in Fig. 23 measure 10 p and 7.5 fj. respectively. 



23. C. furca Cleve var. macroceras Schroder. PL III, Fig. 7. 

 Schroder, 1906, Warm. Meere, p. 351, Fig. 15. 



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

 Cape Goza in Prov. Shima (Aug., 3, 1904) ; Prov. Tosa. 



Breadth measures 12 p in the specimen shown in Fig. 7. 



As I have not seen any European specimen of this species, 

 I here refer my material to the present var. after the opinion 

 of Schroder. 



Section 11. Brevicatenata Gran. 



24. C. crinitum Schiitt. PL III, Figs. 1-3. 

 Schutt, Chaet. u. Perag., 1895, p. 41, PL IV, f. 12, PL V, 



f. 12 b-d; Gran, Diat., 1905, p. 89, f. 113. 



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



Breadth and thickness measure 17/* and 15 p respectively in 

 the specimens represented in Figs. 1-3. 



Section 12. Curviseta Ostf. 



25. C. secundum Cleve. PL IV, Figs. 49-52. 

 Cleve, Java, 1873 b, p. 10, PL II, Fig. 14 ; Ostf. Mar. PL 



Diat., 1902, p. 239.— C. curvisetum Cleve Malay Arch., 1902, 



p. 18 and p. 55 (after Ostf.). 



