C O li^ T E If T S. 



PAGK 



Intboduction i 



Beanch I. — Protozoa 1 



Class I. — Moneka 2 



Class II. — Ehizopoda 4 



Class III. — Gbegarinida 23 



Class IV. — Infusokia 26 



Branch II. — Pokifebata 49 



Class I. ^ Calcispongije 61 



Class II. — CABXEOspoifGi^ 63 



Bkanch III. — Ccblenteeata , 72 



Class I. — Hydkozoa 73 



OrDEB I. — HyDEOIDEA 73 



Order II. — Discophoba 89 



Class II. — Siphonophora 97 



Order I. — Physophob^ 98 



Obdeb II. — Pneumatophoe^ . . . . , 104 



Obdeb III. — DiphyjE 105 



Obder IV. — DiscoiDE^ 107 



Class III. — Ctenophoea 108 



Class IV. — Actinozoa 112 



OEDEE I. — ZOANTHABIA 116 



Obdeb II. — Halcyonoida 121 



BEAJSCH IV. — ECHINODERMATA 135 



Class I. — Crinoidea 139 



Oedee I. — Blastoidea 139 



Order II. — Cystidea 139 



Order III. — Bbachiata 140 



Class II. — Stellerida 147 



Obdeb I. — Ophiuroidea 147 



Order II. — Asteroidea 152 



Class III. — Echinoidea 161 



Order I. — Desmosticha 164 



Order II. — Clypeastrid^ 170 



Order III. — Petalosticha 172 



Class IV. — Holothueoidea 176 



Order I. — Elasipoda 179 



Order II. — Apoda 179 



Order III. — Pedata ISO 



Order IV. — Diplostomidea 183 



