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 proliferum. 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 

 calcareum. Fig. 3. Lithonema crustaceum. Figs. 5 and 6. 

 Oscillatoria lucifuga. 



PLATE LXVI. 



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

 mammillosum. Figs. 4 and 5. Stigonema panniforme. 



PLATE LXVIL 



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 Hibernicum. Fig. 2. Scytommarnyochrous. 



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 interruptum. 



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

 distorta. Fig. 5. Tolypothrix Berkeleyana 9 Fig. 6. 

 Tolypothrix nivea. Fig. 7. Tolypothrix rufescens. 



