- 216 — 



7. C. contort h m (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. gibber um var. contortum Gourret Le. PL II, f. 33 ; Schutt, Pflanzen- 

 leben d. Hochsee, p. 268, fig. 78 VII b. 



2 (rr) — 4 (r). 



Area: Warmer Atlantic, Mediterranean, Red Sea, Indian Ocean, Pacific. 



8. C. tenue Ostenfeld & Schmidt Le. p. 166, fig. 18. 



2 (IT). 



Area: Red Sea, Indian Ocean. 



9. C. macroceras Ehrenberg?; C. tripos ß macroceras Glaparède & 

 Lachmann, Etudes sur les Infusoires et les Rhizopodes, vol. I, PL 19, f. I, 

 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. Gilioflagellaten, Morphol. Jahrb. Bd. 7, 2, Taf. XIV, fig. 27), further 

 a form with longer and more straight posterior horns (cfr. the quoted 

 figure by Glaparède & Lachmann) and also the form figured by 

 Ostenfeld Sc Schmidt Le. 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). 



2(r) - 3(r) - 4 (it) — 5 (it) — 7 (r) — 10 (r). 



Area: Atlantic, Mediterranean, Red Sea, Indian Ocean, Pacific. 



10. C. volans Cleve, Notes on some Atlantic Plankton-Organisms, 

 Kongl. Sv. Vet.-Ak. Hand!., Bd. 34, No. 1, p. 15, Pl. VII, Fig. 4, 1900; 

 Ostenfeld & Schmidt, Plankton fra det Røde Hav og Adenbugten, 

 Vidensk. Meddel. Naturh. Foren. Kjøbenhavn, 1901, p. 168, f. 21. 



2 (IT). 



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 VII, Fig. 12, 1900. 



The horns are often much longer than figured by Cleve. 

 l (rr) 2(+) 3(+) 4 (r) 5 (it) 6 (it) 7 (r) 10 (r). 

 Area: Tropical Atlantic, Red Sea, Indian Ocean. 



12. C. furca (Ehrbg.) Dujardin, Hist. nat. d. Zoophytes, Infusoires, 

 Paris 1841. 



This species occurs in large quantity in our area. 



1 (it) - 2 (+) - 3 (+) - 4 (r) - 5 (r) - 6 (c) - 7 (+) - 8 (it) - 10 (r). 



Area: Ubiquitous. 



; 



