PROTOZOA 



37 



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FIG. XXVII. 



FIG. XXVII. Dinoflagellata. This figure is not contained in the 

 article as published in the Encydopsedia Britannica. It presents 

 the recent discoveries of Klebs, Biitschli, and Stein. 



1. Diagram of the Dinoflagellate Hemidinium. n, nucleus ; /, 



flagellum of the transverse groove ; h, flagellum of the vertical 

 groove. 



2. Diagram of the Cryptomonadine Oxyrrhis (to compare with the 



preceding). , nucleus; g, the deep fossa or pit in which the 

 two flagella are affixed; t, the origin of the flagellum which 

 corresponds with that of the transverse groove of Dino- 

 flagellata. The second flagellum is seen to be attached near 

 the mouth of the fossa. 



3. Olenodinium cinctum, Ehr., seen from the ventral surface, a, 



amyloid granules ; b, eye-spot ; c, chromatophores ; d, flagellum 

 of the transverse groove; c, flagellum of the vertical groove; 

 v, vacuole. 



4. The same, seen from the hinder pole (letters as in 3). 



5. Cuticle of Histioneis cymbalaria, Stein, from the Atlantic, i, 



ventral process ; k, cuticular collar ; I, posterior process. 



6. The same, seen from the dorsal surface, m, cephalic funnel (k 



and I as iu 5). 



7. Cuticle of Amphisolcnia globifcra, Stein, from the Atlantic, seen 



from the left side, i, narrow ventral processes ; m, cephalic 

 funnel ; o, the mouth ; ]>, pharynx ; q, the shrunken proto- 

 plasm. 



8. Cuticle of Ornithoccrcus magnificus, Stein, from the Atlantic. 



mm', the cephalic funnel ; rr', the two largu rilis of the 

 cuticular collar (the collar itself similar to k in No. 5 is not 

 drawn); s, the two rows of dorsal cuticular teeth. 



9. Cuticle of Ceratocorys horrula, Stein, from the Southern 



Ocean, i, the large frontal plate ; pp' the outgrown margins 

 of the transverse groove ; v, if, basal plates ; w, one of the/ 

 four frontal horns ; y, the dorsal horn ; y, the ventral horn. 



