16 



LECTURE II. 



Sub-kingdom Articulata, 

 Class Crustacea. 



Arachnida. 



Insecta. 



Anellata, 



CiRRIPEDIA. 



Kingdom ANIMALIA, 



Sub-kingdom Veriehrala. 



Class Mammalia. 



AVES. 



Reptilia. 

 Pisces. 



Sub-kingdom Mollusca. 

 Class Cephalopoda. 



Gasteropoda. 



Pteropoda. 



Lamellibranchiata. 



Brachiopoda. 



Tunicata. 

 Sub-kingdom Radiata. 



Nematoneura. 



Acrita. 



Class Radiaria, Lamarck. 



Echinoderma, Cuv. 



ACALEPHA, Cuv. 



Class Polypi, Cuv. 



Ciliobrachiata, Farre. Anthozoa, Ehrenb. Nudibrachiata, 



Farre. 

 Class Entozoa, Rudolphi. 



Ccelelmintha, Owen. Sterelmintha, Owen, 



Class Infusoria, Cuv. 



Rotifer A, Ehrenb. 



Polygastria*. Ehrenb. 



LECTURE 11. 



POLYGASTRIA. 



I PROPOSE first to invite your attention to a class of animals, the most 

 minute and apparently the most insignificant of created beings. It 

 might almost seem needful to apologise for the design of trespassing 

 on your time and patience during one or two lectures with the 

 Anatomy and Physiology of creatures which are wholly invisible to 

 the naked eye. But* we are too apt to let our judgments of the im- 

 portance of objects be unduly influenced by first impressions, espe- 

 cially by those of magnitude or the contrary, which deeper insight 

 into their true nature and value rectifies. 



The active atoms about to be described, for the knowledge of whose 



* A Glossary and explanation of the scientific terms will be added to the con- 

 cluding Lecture. 



