Lesson XIV. J 



NATt'KAL HISTORY. 



59 



P. From their habits being concealed | ISti. T. How are they divided ? 

 from observation, we are unable to ascer- j /'. 1. Into the Camosi, or fleshy polypi, 

 tain the part they play in the economy of 2. The GeUitinosi, or gelatinous polypi; 



and 3. The Coralliferi, or corals. 



187. T. Name some examples of each. 

 P. The Actinia Mesembryantftemum is 



71 Name the peculiarities of the 



or sea-nettles ? 



P. They float upon and swim in the 

 water, propelling themselves by alternate 



contractions and dilatations of their gela- 

 tinous bodies. They do not appear to have 



circulation, and their bodies 

 of a net-work of animal filaments, filled up 

 with water, which exudes from their inter- 

 stices when they are cast upop the sea- 

 shore. 



185. 7*. What is there peculiar in the 



They have a visible stomach, and 

 tentacula around their mouths, which vary 



he body is* always 

 Irical, and the viscera 

 oawtimr* .. 



F, 9 . IT. n 



/ >y. 28. Acttmto mutmbrgaiUJumitm. 



an example of the CARNOSI ; the Hydra 

 viridi* of the GELATINOSI ; and Madrepore* 



Of the CORALLIFERA. 



Hi. 



188. T. What is there peculiar in the 

 INFUSI 



P. The greater part of them have a 

 gelatinous body, and very simple .structure. 

 They are very small, and require the aid of 

 a microscope to study their organisation, 

 as they differ somewhat in th- 



tve been divided into the ttuttfera 

 and Homogenea. 



18ft T. What is there peculiar in the 



/'. The body is oval and gelatinous, 

 usually ending in a kind of tail ; while the 

 fore part has a singular : mbrs, 



with teeth at the 



brate rapidly. iur <>f 



toothed wheels revolving. V> 



r. What is supposed to be the 

 use of this apparatus that appears to re- 

 volve ? 



/'. It has been stated to be cm 

 with respiration ; and a* it does not assist 

 the food, there is good reason 

 < d with the 

 u of respiration. 



Pig . tfyrfrorirM*. poofrmh-wttr 

 i the body, containing cn> (th to- 

 il, i.ucrM * * icuucula, wUor.b> u lay* 

 bold oi tu pr*y. 



