N ATl'RAL HISTORY. 



164. T.~ "What kind of insects or ani- 

 mals in the sixth order ? 



P. Such kind as cockroaches and ear- 

 wigs. 



165. T. Give me an example of the 

 seventh order. 



P. The bug tribes. 



166. T. Name the remaining orders. 

 P. 8. Neuroptera. 9. Hymenoptera. 



10. Lepidoptera. 11. Rhipiptera ; and 12. 

 Diptera. 



167. T. Give the peculiarities of each. 

 P. They shall be described when I 



[Lesson XIIL 



know more of Natural History, especially 

 Zoology. 



GENERAL QUESTIONS ON LESSON XII. 



1. Why are insects placed last? 



2. Is there anything peculiar in their 

 organisation ? 



3. How many orders are they divided 

 into ? 



4. Give a familiar object under each 

 order. 



5. Name the peculiarities of each order. 



LESSON XIII. 



THE fourth, and last great division of the animal kingdom, is the radiated animals, 

 or RADIATA. They are called thus because they generally agree in one respect that 

 of having the parts of which they are formed arranged round an axis or central point 

 Their organs of motion, when they have any, consist of moveable spines, or flexible 

 papillae, capable of inflation, attached to the skin. They are divided into five classes, 

 according to their organization. 



QUESTIONS. 



168. T. What is the last class of radi- 

 ated animals called ? 



P. Echinodermata, or bristly skinned 

 animals. 



169. T. State their peculiarities. 



P.- They have a digestive and a vascular 

 system ; a well-organised 

 skin, and a nervous sys- 

 tem which partakes of 

 their general form. 



170. T. How is this 

 cl;i^s divided ? 



P Into two orders; 

 those with feet, or vesi- 

 cular appendages, serving as feet ; and those 

 without. 



171. T. What is the name of the first 

 order ? 



P. PEDICELLATA. 



172. T. Is there anything peculiar in 

 this order ? 



P. Yes ; the skin is pierced with nume- 



Fiy. 21.* 



* Fig. 21. Nervous system of Star-fish a the 

 mouth. 



rous small holes, from each of which pro- 

 trude small tubes, terminating in suckers, 

 which enable the animals to walk, or adhere 

 to rocks. 



Fig. 22. 



173. T. Are all the animals in this 

 order alike? 



P. Not individually, but generally; 



* Fig. 22. The Axttriai aurantin, showing the 

 osseous plates audition^ moveable spine*. 



