APPENDIX. 303 



Division I. Scolecida. — Iiiii^evfectiy segmented ; no lateral ap- 

 pendages ; branched water-vessels ; nervous S3'stcm in anterior part of 

 body. Page 113. 



Section A. Platyelmia. — Orders S : 1. Taeniada. Ex. : Tape- 

 worm. — 2. Trematoda. Ex. : Liver-fluke (Distoma). — 3. Turbella- 

 ria. E.x. : Planarians, Ribbon-worms (Nemertes). Page 114. 



Section B. Nematelmia. — Orders 3 : 1. Acanthocephala. 

 Ex. : Eehinorhynchus. — 2. Gordiacea. Ex. : Hair-worm. — 3. Nema- 

 toidea. Ex. : Vinegar-eel (Anguillula), Round-worm (Ascaris), Thread- 

 worm (Oxyuris), Muscle-worm (Trichina). Page 121. 



Section C. Rotifera (Wheel-Animalcule.s). — Ex. : Crown-Ani- 

 malcule (Stephanoceros). Page 124. 



Division II. Anarthropoda. — Body segmented ; lateral ap- 

 pendages, when present, not articulated to the body. Page 127. 



Class I. Gephyrea. — Ex.: Spoon-worm. Pago 128. 



Class II. Annelida (Ringed worms). — Orders 3 : 1. Hirun- 

 dinea. Ex. : Medicinal Leech (.Sanguisuga), Horse-leech (Hajmopsis). 

 — 2. Oligocliaeua. Ex. : Earth-worms (Lumbricidte), Water-worms 

 (Nais). — 3. Polychasta. Ex. : Tube-worms (Serpula). Page 128. 



Division III. Arthropoda (Articulata). — Jointed appendages 

 articulated to the body. Page 136. 



Class I. Crustacea. — Respiration aquatic ; more than four pairs 

 of legs; two pairs of antenn.'E'; calcareous external skeleton; pass 

 through metamorphosis. Orders 11: 1. Deoapoda. Ex.: Lobster 

 (Elomarus), Hermit Crabs (Pagurus), Crabs (Cancer). — 2. Stomapoda. 

 Ex. : Locust-shrimp (Squilla). — 3. Isopoda. Ex. : Wood-lice (Onis- 

 cus), Slaters (Ligia). — 4. Amphipoda. Ex. : Sand-hopper (Talitrus), 

 Fresh-water shrimp (Gammarus). — 5. Merostomata. Ex. : King- 

 crabs (Limulus).— 0. Trilobita (extinct). — 7. Phyllopoda. Ex. : 

 Brine Shrimp (Artemia). — 8. Cladocera. Ex. : Branehed-horned 

 Water-flea (Daphnia). — 0. Copepoda. Ex. : Cyclops. — 10. Ostracoda. 

 Ex.: Water-fleas (Cypris). — 11. Cirripedia. Ex.: Barnacles (Lepas), 

 Acorn-shells (Balanus). Page 137. 



Class II. Arachnida. — Respiration aeiial by pulmonary sacs or 

 air-tubes. Antenn;c converted into jaws ; head and thorax amal- 

 gamated. Four pairs of legs ; abdomen without limbs. Orders If : 

 1. Podosomata. Ex.: Sea-spider (Pyenogomim). — 2. Aoarina. Ex.: 

 Mites (Acaru.s), Ticks (Ixodes). — 3. Pedipalpi. Ex.: Scorpions. — 4. 

 Araneida. Ex. : House Spider (Tegenaria). Page l.")l. 



Class III. Illyriapoda. — Respiration aerial. Head distinct ; 

 body consists of many rings ; legs more than eight, partly borne upon 

 the abdomen. One pair of antenn:i?. Orders:.': 1. Chilopoda. Ex.: 

 Centipedes.— 2. Chilognatha. Ex. : Millipedes, Page 1.57. 



Class IV. lasecta. — Respiration aerial by trachea.-, Head, thorax, 



