PLATE 1. 



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Thalassicollida. 



Diam. Page 

 Fig. 1. Ad'lssa princeps, n. sp., . , . . . . . . . x 300 13 



The entire living Spumellarium. c, The spherical central capsule containing finely granulated 



protoplasm, which is radially striated in the cortical zone; v, spherical vacuoles enclosed 



by the protoplasm ; n, the spherical nucleus in the centre ; I, the concentric nucleolus : 



X, the radial pseudopodia which pierce the calymma or the (yellowish) jelly-envelope of 



, the central capsule and arise from the granular sarcomatrix. 



Fig. la. Half of the central capsule of another specimen, in which the original central nucleus 



is cleft into numerous small nuclei, . . . . .X 400 



Fig. 16. Half of the central capsule of another specimen, filled up by flagellate spores. . X 400 



Fig. lc. Eight isolated flagellate spores, . . . . . .X 800 



Fig. 2. Thalassolampe maxima, n. sp., . . . . . . x 8 17 



The entire living Spumellarium. c, The big spherical central capsule; a, the large alveoles 

 filling the central capsule and surrounding a central nucleus ; /, the pseudopodia piercing 

 the extracapsular calymma. 



Fig. 2a. The nucleus alone, with numerous nucleoli, . . . . X 30 



Fig. 3. Thalassopila cladococcus, n. sp., . . . . . . . x 20 17 



c. The big central capsule ; a, numerous large alveoles contained in the central capsule ; k, oil 

 globules, many of which are placed in the radially striped cortical zone ; the nucleus 

 placed centrally, is covered with numerous radial apophyses or caecal sacs. /, The radially 

 striped calymma. 



Fig. 4. Thalassicolla maculata, n. sp., . . . . . x 100 21 



c. The central capsule ; v, vacuoles filling this capsule ; n, the central nucleus ; I, the concen- 

 tric nucleolus ; g, the voluminous calymma, a small radial piece of which is only repre- 

 sented ; a, the large alveoles ; 6, peculiar exoplasmatic bodies ; p, black pigment in the 

 inner zone ; /, the retracted pseudopodia in the outer zone. 

 Fig. 4a. An exoplasmatic body, • • ■ - . . .X 300 



Fig. 46. Vacuoles in the endoplasm, . . . . . .X 300 



Fig. 5. Thalassicolla melacapsa, n. sp., . . . . . . . x 300 21 



i, The large nucleus ; I, numerous small nucleoli inside the nucleus ; v, the vacuoles filling up 

 the central capsule and separated by black pigment ; a, large alveoles in the calymma ; 

 k, oil globules ; 6, exoplasmatic bodies ; /, the retracted pseudopodia in the outer zone 

 of the calymma. 

 Fig. 5a. An endoplasmatic vacuole, resembling a cell, . . . .X 600 



Fig. 56. A piece of the central capsule, . . . . . .X 600 



