PLATE LVI. 



FIG. 



I- Lepralia ovalis, p. 307. 



2. Lepralia figularis, p. 314. 



3. Lepralia verrucosa, p. 316. 



4. Lepralia semilunaris, p. 320. 



5. Lepralia Ballii, p. 321. 



6. Membranipora pilosa, p. 327. 6. The stellate variety of 



the natural size. 6.* A few of the cells magnified. 

 6.** Two cells of M. pilosa, from a sketch drawn with 

 the camera lucida by Professor Reid of St. Andrews. 



7. Membranipora membranacea, p. 328. A magnified view 



of some cells from the margin of a living specimen. 



8. Flustra coriacea, p. 349. 



