6i8 



SYNOPSIS OF ANIMAL KINGDOM. 



D. ARACHNIBA. 



Pentastomida. 

 Arctisca or 



Tardigrada. 

 Pycnogonida. 

 Acarina. 

 Araneina. 

 Arthrogastra. 



Pentastoma. 

 Macrobiotus. 



No fossil forms. 



Nymphon. / 



*'AcAEus (Mite), ^Okibates, *Teoiibidium. 

 Epeira (Spider), Linxphia, '^•Protoh/cosa. 

 Scorpio (Scorpion), Chelifer (Pseiidoscorpion), 



£oscorpius, Eophrynus, Architarbiis, Palcco- 



phoneus. 



E. CHUSTACEA. 



I. GNATHOPODA. 



a. merostomata. 



(Placed by some authors in Arachnida.) 



Eurypterida. Exinjpterus, Glyptoscorpius, Hemiaspis, Ptenj- 



gotus, Slimonia. 

 Xiphosura. Limulus (Kiug-crab), Belinurus, Cyclus, Prent- 



wichia. 



b. branchiopoda. 



Trilobita. Acidaspis, Agnofitns, Ampyx, AtigcUna, Asaphis, 



Calymene, C7ieirurus, Micrinurus, Ifomalo- 

 notus, lUcanus, Ogygia, Phacops, PhiUipsia, 

 Trimiclexis. 



Phyllopoda. Apus, Beanchipus, Ceratiocaria, Bithyrocaris, 



Estheria, Hymenocaris, Peltocaris. 



Cladocera. Daphnia ("Water-flea). 



Ostracoda. 



Copepoda. 



C. LOPHYROPODA. 



Baiedia, Candona, Ctpeis, Ctthere, 



JBeyrichia, Cypridea, Entomis, Primitia. 

 Cyclops. (No fossil forms.) 



[The Phyllopoda, Cladocera, Ostracoda, and Copepoda are sometimes included in 

 one group, the Entomostraca.] 



II. PECTOSTRACA (or ANCHORACEPHALA). 



Rhizocephala. Peltoo;aster, Sacculina. (No fossil forms.) 



Cirripedia. Lepas (Barnacle), Balantjs (Acoen-shell), Polli- 



ciPEs, ScALPELLUM, Veeeuca, TwriUpas. 



