249 24 
Area: Red Sea, Malay Archipelago; a very small form occurs in the sub- 
tropical N, Atlantic Ocean (Cleve). ‘ 
65. E, zodiacns Ehbg., Kreideth. p. 71, Pl. 4, f. 8; Leuduger-Fort- 
morel, l. c. p. 40; Cleve, Diat. f. the Sea of Java p. 7;° Atlant. Plankt. 
Organisms p. 326; Pl. f. the Ind. Ocean and the Malay Archip. p. 21. 
10 (rr). 
Area: Neritic species found along the coasts of West-Europe, Malay 
Archipelago, Yeddo Bay in Japan, Puget’s Sound. 
Climacodium Grun. 
66. €. Fraunfeldianum Grun., Novara Exp. 1870, 102, Pl.la, f. 24; 
Ostenfeld & Schmidt, Pl. f. the Red Sea, etc. p. 156; Cleve, Atlant. Plankton 
Organisms p. 314; C. Fraunfeldii Cleve, Pl. f. the Red Sea, p. 1033; 
Cleve, Pl. f. the Ind. Ocean and the Malay Archipelago p.19; C. Jacobi 
Cleve, Phytoplankton p. 22, Pl. 2, f. 18; Climacidium Fraunfeldii Van 
Heurck, Synopsis P]. 106, f. 5. 
Q(rr) — 3(rr) — 7 (rr) — 10 (rr). 
Area: Tropical Atlantic Ocean, Red Sea, Indian Ocean, Malay Archipelago, 
Pacific Ocean. 
Streptotheca Cleve. 
67. §. thamensis Cleve in Shrubsole, Journ. Quekett Microsc. Club, 
1890, IV, n. s. p. 259, Pl. 13, f,4—6; Phytoplankton p. 25, PL2, f. 19; 
Atl. Plankt. Organisms p. 353; Van Heurck, Treatise on the Diatomaceae 
p. 463, f. 194; Ostenfeld & Schmidt, Pl. f. the Red Sea, etc. p. 161; 
S. maxima Cleve, Pl. f. the Indian Ocean and the Malay Archip. p. 23 
and p. 57, Pl. 8, f. 5. 
I am unable to see any difference of specific value between the North 
Sea species and the S. maxima described by Cleve from the Malay 
Archipelago, but the details given by Cleve indicate the correctness of 
Van Heurck in placing the genus in the neighbourhood of Climacodium 
and Hucampia. 
2(r) — 3(-+-) — 4(rr) — 6 (rr). 
Area: Along the coasts of West Europe, N. Atlantic Ocean (rare), Red 
Sea, Malay Archipelago. 
Ditylium Bail. 
68. D. Sol (Van Heurck) Leuduger-Fortmorel, 1. c. p.39; De Toni, 
Sylloge Algarum, Vol. II, p. 1018; Cleve, Atl. Plankt. Organisms p. 325; 
Pl. f. the Indian Ocean and the Malay Archip. p. 21; Triceratium Sol 
Van Heurck, Synopsis Pl. 115, f.1 (1881); A. Schmidl, Atlas d. Diatom. 
Kunde Pl. 152, f. 4, 5, 7-9. 
