11 



Cuss IV. Pteropoda. — P. 175. 



ITow are the raollnsks of this chiss distinguished ? What species 

 Is abundant iu the Arctic seas ? Describe its appendages and 

 Buckers. 



Class V. Gasteropoda. — P. 176. 



Wliat is the structural peculiarity of this class? How is it 

 divided into orders? Name the first of these, and ex]ilain tlie 

 meaning of the term. Name the next, and explain it also. The 

 same with each of the others. What are the habits of the Nudi- 

 branchiata? To what order does the limpet belong? How is its 

 food procured ? What is the peculiarity of the Chilon f To what 

 order does the sea-hare belong ? What is said of one when cap- 

 tured ? What tradition was current about it ? To what order do 

 slugs belong ? Do they pos-sess great sensitiveness ? Any repro- 

 ductive power? What safeguard to some extent is enjoyed by 

 the young ? Have any of these animals a nidimental shell ? How 

 many species of Ifehx are found in Ireland? What is said of 

 them as food for birds ? Are any species eaten by other animals? 

 Have anv been eaten by man ? To what order does the commou 

 whelk belong ? For what is the dog-whelk remarkable ? "What 

 was the Tyrian purple ? How was it procured ? 



Class VI. Cephaiopoda. — P. 184. 



What are the cliaractenstics of the class ? In wnat points of 

 stnicture is it superior to the preceding ? "WTiere was the pearly 

 nautilus taken ? What is said of the structure and the number 

 of its cills? What were the Ammonites? The Orlhoceradtes? 

 AVhat cuttle-fishes have two gills? What was tlie Belemnitel 

 What were its habits? What opinions were current regarding 

 the argonaut ? What is the time accormt of its power of moving ? 

 What function is performed by the arms with the membranous 

 disc? Wliat is the Poulpe? What is the stnicture of its arms? 

 Give an example of its powers of attack and escape. In what 

 respect ha.s it an analogy to the chameleon? To what use has 

 the inlv of the cuttle-fish been applied ? How has the internal 

 bone been used ? Has the flesli been regarded as nutritious or 

 otherwise? Where has it been sold? How has the common 

 Loligo been used at Newfoundland ? What proof is there of its 

 abundance on that coast? Wliat does Mr. Bennett s<iy of tho 

 numbers of another species? What exaggerations have been 

 ciuTent as to the size attained by some of these animals? WluU 

 was the actual size of a very large one found by Captain Cook ? 

 In what are the ova contained ? Are these ova uniformly in clusters 

 or detached ? What remark has Dr. Buckland made respecting 

 fossil species? What is said of the importance of shells in a 

 geological point of view ? What ob6er>ations have been made 

 on the microscopic stmctiure of shells? What was discovered 

 regarding their distribution as to depth in the jEgean Sea? 

 What as to their geographical distribution ? What is the inference 

 t<; be drawn from these phenomena ? 



