93- 
- Diagram of a typical Hydrozoon polyp—after Allman 
. Hydra hanging from water-weed—after Greene é 
. Minute structure of Aydra—after T. J. Parker and sebes 
. Development of ydra—after Brauer 
. Bougainvillea—after Allman 
. Structure of a Medusoid—after Allman 
. Surface view of Aurelia—from Romanes 
. Vertical section of Aure/a—after Claus ; 
. Diagram.of life history of Aure/ia—after Haeckel . 
. Lucernaria—after Korotneff 
. Diagram of Lucernaria—after Allman 
. External appearance of Tealia crassicornis. . 
. Vertical section of a sea-anemone—after Andres 
. Section through -sea-anemone (across arrow in Figure 79)— 
. Alcyonarian Spicules 
. Diagram of a gymnoblastic Hydrotd—after Allman . 
. Graptolites ; ; 
. Hydroids—after Hincks : 
. Campanularian Hydroid—after Allman . 
. Diagram: of a Ctenophore—after Chun 
. Hydroctena. A medusoid with hints of Ctenophore structure 
LIST OF ILLUSTRATIONS. 
after Andres 
. Z, Diagrammatic section of Zoantharian ; re of Alcyonarian 
—after Chun 
. The formation of a coral- shell (Astroides)—after Pfurtscheller 
. Structure of Antipatharians . 
Diagrams of Types of Alcyonarla—after Hickson 
Coralium rubrum, a corner of a Ss Lacaze- 
Duthiers 
Commensalism of sea-anemones and hermit-crab_ . . 
934. Portions of excretory system of flat-worms a . 
94. 
95. 
Diagram of Turbellarian—after Lang i E - 
Structure of liver fluke—after Sommer. From ventral surface. 
The branched gut’(g.) and the lateral nerve (/.7.) are 
shown to the left, the branches of the excretory vessel 
(e.v.) to the right - 
. Reproductive organs of liver ‘fluke—after Sommer : . 
. Life history of liver fluke—after Thomas. : . 
. Diagram of life cycle of liver fluke - 
Diagram of reproductive organs in Cestode joint—Constructed 
from Leuckart . . 
. Life history of Zenda solium—after Leuckart . ‘ 
. Diagram: of life history of Zaxza solium 
. Diagrams of bladder-worms . , 
. Diagrammatic longitudinal section of a Nuedtoas (Amphi- 
porus lactifloreus), dorsal view—after M‘Intosh 
. Transverse section of the Nemertean Drepanophorus latus 
—after Birger . 
. Transverse section of a simple Nemertean (Car inella)—after 
Biirger . . : . . . . 
Xilf 
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