PLATE VI. 



Fig. I. Scirpearella rubra W. and S. Large red colony. Natural size. \a, part of colony X 5- 



Fig. 2. Scirpearella rubra. Smaller red specimen. Natural size. 



Fig. 3. Scirpearella rubra. More slender, white form. Natural size. 



Fig. 4. Scirpearella rubra. Small red specimen. Natural size. 



Fig. 5. Scirpearella rubra. Young colony, white, with opposite calyces. Natural size. 



