EXPLANATION OF THE PLATES, 15 



The figures contained in this plate are taken for the most 

 part from those illustrating M. G. Thuret's paper on the 

 animalcules contained in the anther of Chara. 



PLATE LXIII. 

 Fig. 1. Batrachospermum prolifcrum. — Fig. 2. Batracho- 

 spermum vagum. 



PLATE LXIV. 



Figs. 1 and 4. Raphidia angulosa. — Figs. 2 and 3. Raphidia 

 viridis. 



PLATE LXV. 



Figs. 1 and 4. Rivularia granulifera. — Fig. 2. Lithonema 

 calcarcum. — Fig. 3. Lithonema crustaceum. — Figs. 5 and (J 

 Oscillatoria lucifuga. 



PLATE LXVI. 



Fig. 1. Stigonema atrovirens. — Figs. 2 and 3. Stigonnnc 

 mammillosum. — Figs. 4 and 5. Stigonema panniforme. 



PLATE LXVII. 



Figs. 1 and 2. Hassallia ocellata. — Figs. 3 and 4. Stigo- 

 nema minutum. — Fig. 5. Hassallia ? byssoidea. — Fig. 6. 

 Hassallia ? limbata. 



PLATE LXVIII. 



Fig. 1. Scytonema Hibemicum. — Fig. 2. Scytonema myochrons. 



— Fig. 3. Hassallia compacta. — Figs. 4, 5. Tolypothrix? 

 Dillwynii. — Fig. 6. Petalonema alatum. — Fig. 7. Ar- 

 thronema cirrhosum. 



PLATE LXIX. 



Fig. 1. Calothrix mirabilis. — Fig. 2. Stigonema interruption. 



— Fig. 3. Tolypothrix punctata. — Fig. 4. Tolypothrix 

 distorta. — Fig. 5. Tolypothrix Berheleyana ? — Fig. 6. 

 Tolypothrix nivea. — Fig. 7. Tolypothrix rufeseens. 



