X 
CONTENTS. 
Page 
Order XI.—Diptera, ..... 543 
DIVISION IV.—RADIATA. 
Class X.— Echinodermata, .... 547 
Class XI. — Tunic at a, .550 
Order I.—Ascidiaria,.550 
II.—Bothyllaria,.550 
Class XII_ Entozoa, .551 
Order I.—Elminthogama, .... 551 
II.—Elminthaprocta, .... 553 
Class XIII— Acalepha, ..... 555 
Class XIV— Polypi, . . . . • .556 
Order I.—Polypi Natantes, .... 556 
II. -Tubiferi, .... 557 
III. -Vaginati, .... 568 
IV. - Denudati, .... 570 
V. -Ciliati, .... 570 
Class XV. —Infusoria, ..571 
Order I.—Infusoria Appendiculata, . . 571 
II.-Nuda, .... 571 
