154 ZOOPHYTOLOGY. 
cells above, subspherical, slightly compressed, and beautifully 
marked, as if stamped with a miniature clam-shell. 
The coencecium is very calcareous, forming delicate pure 
white, bushy tufts, about half an inch high. 
It occurs sparingly with Cellularia cuspidata and Dime- 
topia cornuta, parasitical on Catenicella ventricosa. 
Bass’s Strait; Dr. Harvey. And on Catenicella hastata. 
New Zealand ; Dr. Joliffe. 
