PLATE 2. 



Thalassosph^ejrida. 



Diam. Page 

 Fig. 1. Lampoxanthium pandora, n. sp., . ... x 120 38 



The central capsule exhibits distinct pore-canals in its membrane, and a 

 clear interval between this and the coagulated and vacuolated proto- 

 plasm. The central nucleus contains numerous dark nucleoli. The 

 spicula are scattered throughout the alveolate calymma. 



Fig. 2. Thalassoplancta brevispicula, n. sp. (vel Lampoxanthium brevi- 



spiculum), . . . . . . . x 120 36 



The central capsule contains -numerous clear vacuoles, and in the cortical 

 zone a layer of large oil-globules. The central nucleus includes numer- 

 ous dark nucleoli. The calymma is alveolate. The spicula lie only in 

 the cortical zone. 



Fig. 3. Thalassoxanthium cervicorne, n. sp., . . .x300 33 



The central capsule is filled up by clear vacuoles and contains a large 

 central nucleus, with a single nucleolus. The spicula surround the 

 thin calymma. 



Fig. 4. Thalassoxanthium cervicorne, n. sp., . . . x 600 33 



A single spiculum. 



Fig. 5. Thalassoxanthium medusinum, n. sp., . . . . x 120 32 



The central capsule is filled up by clear vacuoles and contains on its cortical 

 zone a layer of large oil-globules. The central nucleus contains numer- 

 ous dark nucleoli. The calymma is radially striped, contains numerous 

 small xanthellae, and is surrounded by the spicula. 



Fig. 6. Thalassoxanthium octoceras, n. sp., . . . x . 400 34 



Three isolated spicula. 



