o Microscopical Essays. 



3. Volvox: fphaericum. Spherical. 



4. Enchelis : cylindraceum. Cylindrical. 



5. Vibrio : elongatum. Long. 



* Membranaceous. 



6. Cyclidium: ovale. Oval. 



7. Paramecium: oblongum: Oblong. 



8. Kolpoda: fmuatum. Sinuous. 



9. Gonium : angulatum. With angles. 



10. Burfaria. Hollow like a purfe. 



II. Thofe that have external organs. 

 * Naked, or not inclofed in a {hell. 

 3. Cercaria: caudatum. With a tail. 



2. Trichoda : crinitum. 



3. Kerona : corniculatum. With horns. 



4. Himantopus : cirratum, Girrated, 



