185 
being longitudinal, and extending along the dorsal and ventral 
surfaces. When viewed from above, the cup-like membrane 
above the transverse groove, was seen to be divided so as to 
appear like two half circles, having a space nearly as wide as the 
body between them. I regret that owing to a want of books 1 
am unable to go fully into the synonymy of this species. However, 
judging from the published descriptions and figures available, 1 
think it highly probable that the form described by Stein as 
D. homunculus is identical with D. inaiqualis , Gourret, and 
D. allieri , Gourret, and that all three are simply immature forms 
of D. tripos , Gourret. 
G. Ornithocercus magnificus, ? Stein; Butschli, 1. c. p. 1011, 
pi. 55, f. 7. 
Two examples were observed, and although the main characters 
of the species were present in the specimens, there appeared to 
be a slight difference in the width and ornamentation of the 
membranous crests ; this may be due to immaturity, and from the 
facts noted in the growth of the previous species — I), homunculus — 
it may be safely inferred that the crests vary in size and structure 
in keeping with the age of the individual. 
Surface, off Green Point, P. J. 
Family Peridinida, Bergh . 
7. Diplopsalis lenticula, , Bergh, 1. c. p. 244, pi. 16, f. GO-62; 
Kent, 1. c. Yol. ii. Appendix, p. 859. Butschli, 1. c. p. 1003, 
pi. 53, f. 2. 
Surface, off Green Point, P. J. 
8. Feridinium divergens , Ehr. ; Kent, 1. c. Yol. i. p. 453, pi. 25, 
f. 8-13. ( Ceratium) Butschli, 1. c. pi. 53, f. 1, a-b. 
A very variable species, scarcely any two individuals being 
found alike. 
Common on the surface, off Green Point. 
9. P. michaelis, Ehr. ; Kent, 1. c. p. 453. ( Ceratium ) pi. 25, f. 23. 
Butschli, pi. 52, f. 8. 
Surface, off Green Point, P. J. 
10. P. globulus , Stein. ; Butschli, 1. c. pi. 52, f. 7. 
Surface, off* Green Point. 
11. Goniodoma acuminata, , Ehr. ; Butschli, 1. c. pi. 52, f. 5, a-b-c. 
Surface, off Green Point, P. J. 
12. Gonyaulax polyedra, Stein. ; Butschli, 1. c. pi. 52, f. 3, a-b. 
Surface, off Green Point, P. J. 
13. Ceratium fusus , Ehr. ; Kent, 1. c. p. 456, pi. 25, f. 40. Bergh. 
1. c. p. 208, pi. 12, f. 7-8, pi. 13, f. 28-32. 
Common on the surface, off Green Point. 
