444 



PROFESSOR LANKESTER. 



Class. 



III. ASTEROIDEA 



Order. Hxamples, 



Grade a. ASTERI^E. 

 C Uraster. 

 < Solaster. 

 (^ Astropecten. 



Brisinga. 

 OPHIURM 

 f Opkiura. 

 1 OpMot/irix. 

 j Eur^ale. 

 {^Saccocoma. 



1. Colastra 



2. Brisingastra 



Grade b 



1. Ophiastra 



2. Phytastra 



Branch b. 



I. Crinoidea 



1. Tessellata 



2. Articulata 



TENTACULATA. 



Ch/athocrinus. 

 Marsupites. 

 Comatula. 

 Rhizoci'inus . 



II. Blastoidea 



III. Cystidea 



1. Eloeacrina 

 a. Eleutherocrina 



1. Agelacrina 



2. Echinencrina . 



Eloeacrimis. 

 Pentatrematites. 

 Eleutkerocrimcs. 

 Hedriaster. 

 Hemici/stites. 

 Spkaronites. 

 _Stepha7iocrinus. 



Classes and Orders of PLATYELMIA. 



Branch K. CILIATA. 



C Mesostomum. 



I. PLANARIiE 



II. Nemebtina 



I. Trematoidea 



II. Cestoidea 



{1. Rhabdocoela 

 2. Dendrocoela 

 {1. Anopla . 

 2. Enopla 



Branch b. SUCTORIA. 



{1. Monogenea . 

 2. Digenea 

 fl. Caryophyllidea 

 2. Tetraphyllidea. 

 -< 3. Diphyllidea 



\^ Microstomum. 

 Bolycelis. 

 Bipalium. 

 Linens. 

 Nemertes. 

 Borlasia. 

 Prorhynchis. 



[ 



4. Pseudophyl- 

 lidea 



5, Cyclophyllidea 



f Aspidogaster. 

 "XPoli/stoma. 

 [JDistoma. 

 \Monostoma. 

 CaryophyllcBus. 



{Tetrarhynchus, 

 Phyllobothrium, 

 Echinobothfium . 



{Ligula. 

 Bothriocephalus, 

 Tcenia, 



