PLATE LVI. 



FIG. 



X- 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. 



