4:90 APPENDIX 



HIRUDINEA. Annelida with short rings or none at all and with 

 a ventral sucker ; "bloodsuckers." Clepsine (175) ; Nephelis (175). 



ARTHROPODA 



Symmetrical, segmented animals, mth jointed appendages. 



CRUSTACEA. Typically, aquatic and gill-bearing Arthropoda. 

 Two pairs of antennie, except in Gigantostraca. 



[EXTOMOSTRACA]. Crustacea with varied number of 

 pairs of appendages ; usually of small size. Bhanchiopoda, man- 

 dibles without palps, numerous legs (156). Thilobita, fossil (160). 

 Cladocera, mandibles palpless, few legs (157). Ostracoda, palp 

 on mandible, onl3' two pairs of legs (157). Copepoda, elongated 

 Crustacea, with only one pair of ma.xillas ; females with external 

 ovisacs (158). Cirripedia, attached Crustacea (barnacles, 158). 



[MALACOSTRACA]. Crustacea with nineteen pairs of ap- 

 pendages. Amphipoda (146). IsopoDA (145). Stomatopoda (144). 

 PoDOPHTHALMATA : [M.acrura], large-tailed Podophthalmata : C'ari- 

 diJce (1.38); Astacida: (131); Thalassinidae (138); Paguridce (12,%) ; 

 Hippidrc (140). [Brachyura], crabs: Oxyrhyncha (140); Cyclo- 

 melopa (141); Cnloinelopa (143). 



[GIGANTOSTRACA]. Crustacea with five pairs of appen- 

 dages on cephalo-thorax, abdomen without feet ; body ends in a long 

 telson, Limulus (146). 



ARACHNOIDEA. Air-breathing Arthropoda without antenna?. 

 AcARiNA, mites (117). Pycnogonida, sea-spiders (119). Are- 

 NEINA, spiders: Saltigradce (110); CitigradiT (109); Lalerigradoe 

 (109) ; Tuhilelaria: (105) ; Retitelarice (106) ; Orhitelaria- (106) ; 

 Terrilelarice (105). Phalanoina, harvest-men (117). Arthro- 

 gastra, scorpions (116). 



TRACHEATA. Air-breathing Arthropoda, with one pair of 

 antennse. 



(PROTRACHEATA). Tracheata with worm-like body. 

 Each segment of the trunk bears a short, stout appendage. Peri- 

 patus (101). 



[MYRIAPODA]. Tracheata with distinct head and abdo- 

 men, all the segments of the abdomen bearing appendages. Chi- 



