Dinophysis Ehrenberg. 



38. D. homimculus Stein, 1. c. Pl. XXI, f. 2, 5. 



Together with the type there occurs in the Gulf of Siam a form viz. 



f. pedunculata Schm. n. f., which is characterized by the long and 

 plainly set off posterior protuberance. 



3 (r) - 4 (r) - 6 (+) - 7 (it). 

 Area: General in warmer Seas. 



39. D. miles Cleve, Plankton from the Red 

 Sea, Öfv. af Kongl. Sv. Vet.-Ak. Förh. 1900, No. 9, 

 p. 1030, Fig. 1 ; D. aggregata Weber van Bosse, 

 Annal, du Jardin Bot. de Buitenzorg, 2 e sér., vol. II, 

 p. 140, Pl. XVII, f. 3-4; Heteroceras Schröter i 

 Achille Forti, Ber. d. deutsch. Botan. Ges. 1901, 

 p. 6, f. I— II. 



var. indien Ostf. & Schm. I.e. p. 170. 



2(rr) - 4(rr). 

 Area: Indian Ocean. 



40. D. sphaerica Stein I.e. Pl. XX, f. 3-4. 



5 (IT) - 10 (IT). 



Area: Atlantic, Red Sea, Indian Ocean. 



41. D. rotuiidata Clap. & Lachm., I.e. p. 409, Pl. XX, f. 16; Jør- 

 gensen, 1. c. p. 31. 



5 (IT). 



Area: Atlantic. 



Amphisolenia Stein. 



42. A. bidentata Schroder, I.e. p. 20, Pl. I, f. 16 a — c. 



2 (it) - 3 (rr) — 4 (it) - 5 (it) — 7 (it). 

 Area: Mediterranean, Red Sea, Indian Ocean. 



Ornithocercus Stein. 



43. 0. magnificus Stein. I.e. Pl. XXIII, f . 1 ; Schutt, Centrifugal. 

 Dickenwachsthum der Membran, Bot. Ztg. 1900, p. 18 (Sep.), f. 8 — 10. 



2 (IT). 



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



Murracytae. 

 Pyrocystis Murray. 



44. P. lunula Schütt. 



2 (IT). 



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



Fig. 8. Dinophysis 

 homimculus Stein, 



f. pedunculata. 



Lateral view. 



