10 



MOLLUSC A.— p. 155. 



What is the meaning of the term ? What is tlic arrangement 

 of tlie nervous system ? What is remarked of tlic blood ? Where 

 are they found? AVhat is said of their form and colouring? 

 V.'liat of the uses to which they are applied ? What of their sizes ? 

 How is the shell secreted ? Of what is it composed ? How is the 

 colouring matter deposited ? Give examples of change of form in 

 Ehrlls with their growth, or from other circumstances. What was 

 done by Aristotle in this department of luiowledge? What by 

 Pliny? What by Linnceus? What by Cuvier? "What are tlic 

 two leading divisions of the Mf)nusca ? Into how many "classes" 

 are each of these gi'oups divided ? By what characteristics are 

 these classes distinguished ? Give the name of each, and the 

 meaning of the term. 



Class I. Tunicata.— P. 1G3. 



What kind of mollusks arc said to be "tunicated?" What is 

 best known species ? Describe its appearance and structure. Has 

 any species a transparent covering ? What has been obseiwcd 

 respecting the circulation in these animals? Are the young free 

 or fixed ? Do any of tliem possess a power of biidding ? What 

 are BotrylH? What is the most striking pecidiarity of the Pyro- 

 soma? AVhat is stated respecting the Salpx? 



Class H. Beachiopoda. — P. 165. 



What are they ? Where are they found ? At what depths ? 

 What is Profes.sor Owen's remark ? 



Class in. Lamellibrajnxuiata.— P. 166. 



What is the stmcture of the gills? What common molhisks 

 belong to this class ? Where do the ova remain for some time ? 

 What is said of the young ? How is the oyster supplied with food ? 

 Are they sensil)le of changes of light ? Where are the young 

 deposited ? What of their growth ? State the origin of pearls. 

 What has been said of the value of some ? Where is the pearl 

 oystcT found ? How long can a diver remain under water ? What 

 revenue was at one time derivable from the pearl fisheries of 

 Ceylon ? How docs the large scallop move ? What is meant by 

 the " byssus" of the mussel? What use was made of it at Bide- 

 ford? To what has that of the Pinna been applied? Describe 

 the use of the foot of the cockle ? Wliat is its structure ? What 

 was believed to be the weight of limpets used as food at Larne in 

 1837 ? What was the entire weight of "shell-fish" as earned from 

 the beach ? What prices are Carriekfergus oysters compared with 

 pearl oysters? Give examples of certain species used as food, 

 being restricted to certaiii localities. Mention some of the boring 

 mollusks. State instances of damage done by the Teredo. What 

 is the best defence against them? What example is given of 

 benefits derived through their agency? 



