zoo 



ZYM 



ted from a centre. These sub-king- 

 doms contain each several classes, as 

 may be seen in the table. 



Kingdom Animalia. 

 Sub-kingdom Vertehrata. 

 Class M.iMMALiA, mammals. 

 AvES, birds. 

 Reptilia, reptiles. 

 Pisces, fishes. 



Sub-kingdom ArticuJata, 



Class Crustacea, such as lobsters. 

 Arachnida, spiders. 

 Insecta, insects. 

 Anellata, icorms. 

 Cirripedia, barnacles. 



Sub-kingdom Molhuca. 



Class Cephalopoda, with a cartilagi- 

 nous head. 



Gasteropoda, with an organ 

 forlocomotion situated under 

 the stomach, as the snail. 



Pteropoda, organs of locomo- 

 tion two membranous tins, 

 situated at the sides of the 

 neck. 



Lamellibranchiata, without 

 head, the gills disposed in 

 bands, as oysters. 



Brachiopoda, without head, en- 

 closed in a mantle, with two 

 fleshy arms. 



Tunicata, without head, with- 

 out shell, covered with a 

 membrane. 



Sub-kingdom Radiata. 

 Nematoneura, nerves apparent. 

 876 



Acrita, nerves rudimentary. 

 Class Echinoderma (Cuvier), those 

 furnished with a crust. 



AcA leph A (Cuvier), those which 

 are witiiout crust. 



Cceleljuntha ((Jwen),^ Ento- 

 zoa, with a distinct alimen- 

 tary canal. 



Sterklmintha (Owen), without 

 a separate abdommal cavity, 

 hydatids. 



Ciliobrachiata (Farre), with a 

 distinct abdomen and anus. 



Nudibrachiata (Farre), corals 

 without intestines or sepa- 

 rate anus. 



Rotifera (Ehrenb.), Infusoria, 

 furnished with a nervous sys- 

 tem, a distinct abdominal 

 cavity, and cillias around tlie 

 rnouth. 



Polygastra (Ehrenb), Infuso- 

 ria, a simple jelly containing 

 many cavities or stomachs. 



ZOONOMY. General animal 

 physiology. 



ZOOPHYTES, ZOOPHYTA (from 

 and ivTov, a plant). Plant-like 

 animals, as the corals, corallines, 

 sponges. 



ZU.MIC ACID. An acid found in 

 sour bread, and other vegetable bod- 

 ies, resembling the lactic acid. 



ZYGO.MA. The zygomatic pro- 

 cess of the temporal bone, which, 

 with the molar or check bone, forms 

 the zygomatic fossa or cavity under 

 the temple. 



ZYMOME. Zimome. 



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THE XND. 



