185 



being longitudinal, and extending along the dorsal and ventral 

 surfaces. Wlien viewed from above, the cup-like membrane 

 abo^'e 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 I 

 am unable to go fully into the synonymy of this species. However, 

 judging from the published descriptions and figures available, I 

 think it highly probable that the form described by Stein as 

 D. homunculus is identical with D. ina'.qualis. Gourret, and 

 D. allieri, Gourret, and that all thi-ee are simply immature forms 

 of D. tripos, Gourret. 



6. Ornithocercus magnificus, ? Stein ; Biitschli, 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 — D. Itomimculus — 

 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 Pekidinida, Beryh. 



7. Diiilopsalis lenticida, Bergh, I.e. p. 241, pi. IG, f. (J0-G2 ; 



lv(nit, 1. c. Vol. ii. Appendix, p. 859. Biitschli, I.e. p. 1003, 

 pi. 53, f. 2. 

 Surface, off Green Point, P. J. 



8. Feridinium diveryeus, Ehr. ; Kent, 1. c. Vol. i. p. 453, pi. 25, 



f. 8-13. {Ceratium) Biitschli, 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. F. michaelis, Ehr. ; Kent, 1. c. p. 453. (Ccratium) pi. 25, f. 23. 



Biitsciili, pi. 52, f. 8. 

 Surface, off Green Point, P. J. 



10. P. ylobidus, Stein. ; Biitschli, 1. c. pi. 52, f. 7. 

 Surface, off" Green Point. 



11. Goniodoina acuminata, Ehr. ; Biitschli, 1. c. pi. 52, f. 5, a-b-c. 

 Surface, off Green Point, P. J. 



12. Goiiyaidax polyedra. Stein. ; Biitschli, 1. c. pi. 52, f. 3, a-b. 

 Surface, off Green Point, P. J. 



13. Ceratiuni fusus, Ehr. ; Kent, 1. c. p. 45G, pi. 25, f. 40. Bergh. 



1. c. p. 208, pi. 12, f. 7-8, pi. 13, f. 28-32. 

 Counuon on the surface, off Green Point. 



