may, 1907.1 OKAMURA.—CHAETO. & PERAGAL. OF JAPAN. 91 



Loc. in Jap. : 40 miles off the coast of Shinshirijima (Kurile). 



The specimens figured measure: in Fig. 33, breadth =19//, 

 length = 27 ft; in Fig. 37, diameter = 19 fi ; diameter rarely at- 

 tains the length of 40 ft. 



6. C. peruvianum Btw. PL IV, Figs. 67-75. 

 Btw., Microsc. Journ. 1856, p. 107, PL VII, f. 16-18 ; Ostf., 



Mar. PL Diat. p. 238 ; Gran., Diat., p. 70, Fig. 84 ; etc. 



Loc. in Jap. : Prov. Tosa ; Prov. Shima (Feb., 3, 1904) ; 

 Shirahama in Prov. Boshyu (May, 1904). 



In the specimen shown in Fig. 75 which has longer cell, the 

 breadth of cell measures 17 ft. 



7. C. rostratum Lauder. PL III, Fig. 15 a. 

 Lauder, Hongkong, 1864, p. 79, PL VIII, Fig. 10. 



Loc. in Jap. : Cape Goza in Prov. Shima (Aug., 2, 1904). 

 Length and breadth of cell 30 ft and 20 ft, as measured on 

 the specimen represented in Fig. 15 a. 



8. C. denticulatum Lauder. PL IV, Fig. 66. 

 Lauder, Hongkong, 1864, p. 79, PL VIII, Fig. 9.— Schroder, 



Warm. Meere, 1906, p. 349, Fig. 14 a. 



Loc. in Jap. : Cape Goza in Prov. Shima (Aug., 2, 1904). 



Length and breadth of cell, 32 ft and 15 ft, as measured on 

 the specimen represented in Fig. 66, and 42 ft and 20 ft in that 

 of Fig. 66a. Valve measures 13 ftx 17 ft in the specimens shown 

 in Fig. 16 6. 



The position of teeth in the narrower and broader form of 

 the present species is misrepresented in the figure given by 

 Schroder, 1. c. Fig. 14 a and b. That represented by Lauder 

 1. c. Fig. 9 c is correct. Our figure 66 shows the terminal cell 

 on the anterior end of a chain, while Fig. 66 a, that on the 

 posterior. 



9. C. nanodenticulatum Sp. no v. 



C. denticulatum Lauder Breitere Form in Schroder, Warm. 

 Meere, 1906, p. 350, f. 14 b. 



Chain consisting of few cells, straight and not 'twisted, shorter 

 than broad, length being almost half as broad. Cells oblong 



