— 216 — 
7.  contortum (Gourret) Cleve, Notes on some Atlantic Plankton- 
Organisms, Kgl. Sv. Vet.-Ak. Handl. Bd. 34, No.1, p.14, Pl. VII, f.12, 1900; 
C. gibberum var. contortum Gourret l.c. PI. Il, f.33; Schtitt, Pflanzen- 
leben d. Hochsee, p. 268, fig. 78 VILb. 
Q(rr) — 4(r). 
Area: Warmer Atlantic, Mediterranean, Red Sea, Indian Ocean, Pacific. 
8. ¢. tenue Ostenfeld & Schmidt ].c. p. 166, fig. 18. 
2 (rr). 
Area: Red Sea, Indian Ocean. 
9. . macroceras Ehrenberg?; C. tripos @ macroceras Claparéde & 
Lachmann, Etudes sur les Infusoires et les Rhizopodes, vol.J, Pl. 19, f. 1, 
Mém. de l'Inst. Génévois, t. V—VI, 1858—59. 
This species varies much in regard to length, direction and spinosity 
of the posterior horns. I saw forms agreing with Bergh’s figure (Orga- 
nismus d. Cilioflagellaten, Morphol. Jahrb. Bd. 7, 2, Taf. XIV, fig. 27), further 
a form with longer and more straight posterior horns (cfr. the quoted 
figure by Claparéde & Lachmann) and also the form figured by 
Ostenfeld & Schmidt l.c. fig. 19, where the posterior horns are short 
and ventrally bent. In the Gulf of Siam C. macroceras sometimes occurs 
in short chains (2 specimens together). 
Q(r) — 3(r) — 4(rr) — 5 (rr) — 7(r) — 10(r). 
Area: Atlantic, Mediterranean, Red Sea, Indian Ocean, Pacific. 
10. ©. volans Cleve, Notes on some Atlantic Plankton-Organisms, 
Kongl. Sv. Vet.-Ak. Handl., Bd. 34, No.1, p.15, Pl. VII, Fig. 4, 1900; 
Ostenfeld & Schmidt, Plankton fra det Rode Hav og Adenbusten, 
Vidensk. Meddel. Naturh. Foren. Kjobenhavn, 1901, p. 168, f. 21. 
2 (rr). 
Area: Warm Atlantic, Red Sea, Indian Ocean. 
11. C. flagelliferum Cleve, Notes on some Atlantic Plankton-Organisms, 
Kongl. Sv. Vet.-Ak. Handl., Bd. 34, No.1, p. 14, Pl. VI, Fig. 12, 1900. 
The horns are often much longer than figured by Cleve. 
ler) 2(+) 844) 4@) 50) 6€@r) 7(r) 100). 
Area: Tropical Atlantic, Red Sea, Indian Ocean. 
12. €. furea (Ehrbg.) Dujardin, Hist. nat. d. Zoophytes, Infusoires, 
Paris 1841. 
This species occurs in large quantity in our area. 
1 (xr) — 2(+) — 3(+) — 40) — 50) — 6) — 7(4) — 80m) — 10. 
Area: Ubiquitous. 
