144 



PEOr. ST. GEORGE MIVAUT ON 



sarcode save in the exceptional form Myxobracliia. In that 

 genus, however, small calcareous bodies are to be found col- 

 lected towards the ends of its depending processes. These bodies 

 closely resemble the coccoliths and coccospheres which have been 

 found so extensively at the bottom of the sea. It seems to me 

 not improbable that these bodies are the remains of food ; and 

 that the same may be the case with " minute echinated calcareous 



Fig. 4. 



Myxohrachia gluteus, a, extracap- 

 sular aheoli ; b, capsule ; c, nuclear 

 vesicle ; d, gelatinous substance ; f, 

 coccolith-like concretions at the end 

 of the arm-like processes. (After 

 Haeckel.) 



spheres, looking like the rowels of spurs," described as scattered 

 irregularly in the gelatinous outer substance of Calcaromma 

 calcarea, a new form noticed and figured by Sir C. Wyville 

 Thomson*. 



Certain peculiar structures already mentioned (the "yellow 

 cells ") are very characteristic of the Eadiolaria, being found in all 

 except some Acanthometra forms, though their number is very 

 inconstant in the same species f- They are nucleated, and their 

 yellow protoplasmic contents, which contains starch-granules, is 

 enclosed in a distinct membrane. 



* ' Voyage of the Challenger,' vol. i. pp. 232-33. 



t See representations in Archiv fiir mikrosk. Anat. vol. vii. pi. 29. figs. 

 30-36. 



