ZOOLOGICAL GLOSSARY 765 



Heliodrilus. An oligochsete worm. 



Helix. The common genus of snail: a gastropod mollusc (Pulmonate), 142 



H. ASPERSA. Garden snail. 



H. POM ATI A. Edible (Roman) snail. 



Heloderma. The Gila monster : a poisonous lizard of Mexico and Arizona, 359. 



Helophilvs. The hover-fly: a dipterous insect, 141 



HEMICHOKDATA. A sub-i3hylum of the Protochordata, including Balanoglossus. 



Hemichromis bimacvlatvs. a jewel fish (spotted cichlid): teleostean fi.sh. 



Hemidacttlvs. a nocturnal gecko: lacertilian reptile (Geckonidse), 629 



Hemhitsis. a mysid (opossum shrimp): schizopod crustacean. 



HEMiPTEBA. An Order of insects, comprising the bugs — Homoptera (cicadas, aphids, etc.), 



and Heteroptera (bed-bug, Notonecta, etc.). 

 Herpestes. The mongoose: a viverrine carnivore, 472 

 Heterodos madaoascariensis. Madagascar sharp-nosed snake: a reptile. 

 Heterodostus phillippi. Port Jackson shark: a selachian fish, 286 

 HETEROPODA. A class of pelagic gastropod molluscs (Prosobranchs), including Pterotrachea, 



Ckirinaria, etc. 

 Heteroteuthis. A deep-sea luminous squid: cephalopod mollusc. 

 HioDo.y. "Moon-eye": a fresh-water teleostean fish. 

 Hippocampus. The sea-horse: a teleostean fish, related to pipe-fish, 310 

 HiPPOLYTE variaxs. The chameleon jjrawn: a decapod crustacean, 91 

 Hippopotamus. The hippopotamus: an artiodactyl of the pig family (Suoidea). 

 HiRUDiNEA. The leech family : annelid worms. 

 HiRUDo MEDiciXALis. The medicinal leech, 193 

 Hirundo rustica. The chimney swallow: a passerine bird, 414 

 HOLOCEPHALIA. A sub-class of the cartilaginous fishes comprising the chimseras. 

 HOLOSTEI. A sub-class of bony fishes, comprising the gar-pike and the bowfin. 

 HoLOThURiA. A sea-cucumber: echinoderm (Holotliuroidea), 185 

 HOLOTHUROiDEA. A class of Echinodemiata, comprising the sea-cucumbers. 

 homalopsintE. a sub-family of colubrid snakes, comprising some species of river-snake. 

 HoMARUs vuLOARis. The common lobster: a decapod crustacean, 206 

 Hr.ENA. The hyaena: a nocturnal carnivore (Fissipede), 444 

 H. BRuyxEA. Brown hyaena. 

 H. STRIATA (fir-EXA). Striped hyaena. 



Hi'DRA. A fresh-water polyp: hydrozoan coelenterate, i<^2 

 HYDRACARiNA (hydrachnida). Watcr-mites : a family of Acarina. 



HrDRocHCERus CAPrSARA. The capybara: the largest of the rodents (Hystricomorpha). 

 HYDROID. Colonial polyp stage of a hydrozoan coelenterate, from which free-swimming 



inedusoids are liberated. 

 Htdroides. a genus of polychaete worm. 



HYDROPHiN.E. A sub-family of the Elapidse, comprising the .sea-snakes. 

 HYDROZOA. A class of ccelentcrates, consisting of the solitary and colonial polyps and medu- 



soids. 

 Htgrobates. a fresh -water mite: Hydracarina. 



HriA arborea. European tree-frog: an anuran amphibian (Hylida^), 341 

 H. ccERULEA. Australian green tree-frog. 

 H. VASTA. Giant tree-frog of Haiti. 



Hylobates. The gibbon: an anthropoid ape (Primate). 



HrMEXOL.EMUs MALACORHi-ycHVs. New Zealand Vjlue duck: Anseriformes (Anatidae). 

 HYMENOPTERA. An Order of insects comprising the bees, ants, wasps (Aculeata), and the 



sawflies, ichneumon flies, etc. 

 HyyoBius. A Japanese salamander: urodelan amj^hibian. 

 HrPERooDON. The beaked or bottle-nosed whale: a cetacean (Odontoceti). 

 HrpyARCE. An electric ray: selachian fish. 

 HrpoOEOPMis. A caeeilian amphibian. 



HrPOPACHUs lycRASsATUs. An American toad: an anuran amphibian. 

 HrpsiOLEyA. Spotted night snake: a colubrid snake. 

 HrpsiPRYMyvs RUPEscEys. Rufous rat-kangaroo: a marsupial (Macropodidse). 



