Plate 3. 



Pennaria tiarella, page 7. 

 Fig. 1. Base of a stem of a colony growing on a pile of the wharf, Woods Hole, Mass. 



x 20. 

 Fig. 2. Top of the same stem, x 20. 

 Fig. 3. Top of a stem of a colony growing on a blade of eelgrass (Zostera), "Woods Hole, 



Mass. x 20. 

 Fig. 4. Base of the same colony, x 20. 



