DESCRIPTION OF PLATES. 



PLATE 



IX. Fig. 1. Catenicella elegans, p. 10 (var. South Africa), 

 front ; fig. 2, back ; fig. 3 (var. Australia), 

 front ; fig. 4, back. 



X. Fig. 1. Catenicella cornuta, p. 11, front; fig. 2, back; 



fig. 3, side view. 



Fig. 4. Catenicella umbonata, p. 11, front-, fig. 5, 

 back. 



XI. Fig. 1. Catenicella taurina, p. 12, front-, fig. 2, lack-, 

 fig. 3, with ovicells ; fig, 4, spines replaced 

 by avicularia. 



XII. Fig. 1. Calpidium ornatum, p. 15, natural size ; 

 fig. 2, front. 



XIII. Fig. 1. Calpidium ornatum, p. 15, front view of bi- 



furcation ; fig. 2, back of cell. 



XIV. Fig, 1. Alysidium lafontii, p. 14, front of cell-, fig. 2, 



side view, showing the avicularium; fig. 3, 

 back -, fig. 4. back, at a bifurcation ; fig. 5, 

 natural size. 



Fig. 6. Alysidium parasiticum, p. 14, front, with an 

 ovicell; fig. 7, back; fig. 8, side view; 

 fig. 9, natural size. 



XV. Fig. 1. jEtea anguina, p. 31. 

 Fig. 2. ^Etea dilatata, p. 31. 



XVI. Fig. 1. Beania australis, p. 32; fig. 2, portion of cell 

 to show the lateral processes ; fig. 3, a more 

 highly magnified view of the costce. 

 Fig. 4. Caberea boryi, p. 38, front; fig. 5, back. 



XVII. Fig. 1. Hippothoa patagonica, p. 30. 

 Fig. 2. Scruparia chelata, p. 29. 



XVIIL Fig. 1, 2. Hippothoa catenularia, p. 29. 

 Fig. 3, 4. Hippothoa divaricata, p. 30. 



XIX. Fig. 1 . Menipea fuegensis, p. 2] , front view ; fig. 2, 

 back view ; fig. 3, larger view of mouth of 

 cell with the avicularium. 



XX. Fig. 1. Menipea cirrata, p. 21, front; fig. 2, back. 

 Fig. 3, 5. Menipea ternata, p. 21, front; fig. 4, back. 



