90 r!I E BO '/'. I A R \ I L MA QAZINK [Vol. xxi. No. 144. 



2, f. 7 b-d.—C. boreale v. c/ei7sa Cleve Treatise, 1897 a, p. 20, 

 PI. I. Figs. 3-4. 



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



Breadth and length of cell, 7.5// and 20 /i, as measured on 

 the specimen shown in Fig. 16. 



1). C. boreale Bail. PI. Ill, Figs. 18-20. 



Cleve, Treatise, 1897 a, p. 20, PI. I, f . 1 ; Gran., Diat., 1905, 

 ]). 73, Fig. 87. — C. boreale v. Brightwelli Cleve Arctic Sea, 

 lS73a, p. 12, PI. II, Fig. 7 a (not b-e) ; Cleve, Treatise, 1897a, 

 p. 20, PL I, f. 2. 



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



The specimens figured measure: in Fig. 20, breadth = 37 ft, 

 length = 30-45 // ; in Fig. 19, thickness = 26-30 ju ; thickness of 

 spine in Fig. 20, 3.7 ji. 



4. C. coarctatum Lauder. PI. Ill, Figs 25-32. 

 Lauder, Hongkong, 1864, p. 79, PL VIII, Fig. 8 a-b ; Cleve, 



Java, 1873, p. 9, PL II, Fig. 10 a-c ; Cleve, Treatise, 1897 a, 

 p. 20 ; Gran., Diat., 1905, p. 68, Fig. 80.— C. boreale v. rudis 

 Cleve Treatise, 1897 a, p. 20, PL I, f. 5.—C. rudis Cleve, Season. 

 Distr., 1901, p. 308. 



Our specimens exactty resemble to those which are illustrated 

 in Cleve's Diat. found on the surface of the Sea of Java PL II., 

 Fig. 10 a-c and the complete specimen has not yet been found. 

 Mr. Yendo told me that he found a vorticella attached on the 

 body of the plant of this species, whenever he examined it, and 

 I also found it to be the case. At present we do not know 

 what relation exists between the plant and the vorticella. 



Loc. in Jap. : Prov. Tosa ; Prov. Shima (Aug., 2, 1904) ; 

 Shirahama in Prov. Boshyu (May, 1905) ; Misaki in 

 Prov. Sagami (Yendo). 



Breadth, length and thickness of body measure 30— 35 fi, 45— 

 50 fJt and 20-27// respectively in the specimen shown in Fig. 29. 



5. C. criophilum Castr. PL III, Figs. 33-37. 

 Castr. Challenger Re])., 1886, p. 78 with figure ; Jorgensen, 



Protistenplankt. L901, p. 20 ; Gran, Diat., 1905, p. 71, Fig. 85. 



