122 ZOOLOGY. 



37. ("Hive examples of tins class, and state whether they live on 



land, in fresh water, or in the sea. 

 *'S. I low is locomotion effected in this class ? 

 :;'.>. What is meant l>y tin; "foot"? 



40. What arc the //</< roj>oif<i, '! 



41. What is the operculum ? 



42. Descriho the univalve shell possessed by most gasteropoda. 



43. What arc multivalvc shells? 



44. What gasteropoda are without shells ? 



45. How may it be ascertained, by examining a gasteropod shell, 



whether the inhabitant \vas carnivorous or vegetable- 

 feeding ? 



40. 1 then- any connection between the notches found in certain 

 shells and the carnivorous habits of the animals ? 



47. Describe the " eye-stalks " of a snail. 



IS. < Jive an account of the digestive apparatus. 



49. What is the distinction between the /'u lino-Gasteropoda and. 

 the Brancldo-Gastcropoda? Give examples of each. 



60. How is respiration effected in the J/etcropoda&nd. sea-slugs? 



. r > I . What air-breathing gasteropods live in water ? 



52. What are otoliths t 



53. Show that the larvos of certain gasteropods resemble the 



:i<hilt /Ym>/W<r. 



64. Why are the I ^niirHihrtiiicluata SO called ? 

 [>f>. (Jive examples of this class, distinguishing between marine 



and fresh-water species. 



56. By what other names is this class known? 



57. Distinguish the bivalve shells of the LamdUbranchiata from 



those of the Brochiopoda* 



58. Explain the following terms: Umbo, inequilateral, ci/ui- 



lateral, c^uivalvc, Icmjdi, breadth, pvxl.n'ivr side, anterior 

 aide, /i.sv, /'//>, l'njiiicnt, mr//7m/r. 



.7.). How ai-e the valves opened and shut? 



('(). Why does a dead oyster always gape? 



(il. What is meant by the " foot" of a lamellibranch ? 



02. Explain the terms : Pallial line, pallial sinus, muscular im- 

 pressions. 



63. Describe the digestive apparatus. 



64. What are palpi ? 



(>;"). What is believed to be the nature of the food? 



66. Describe the heart and circulatory organs. 



(>7. I Tow is respiration ellccted ? 



(IS. Describe the gills. 



lil). 1 1 o w are respiration and sustentation connected in this class? 



70. What lamellibranchs possess breathing siphons? 



71. 1 >escribe the nervous system and the organs of sight ? 

 7-. (live examples of sessile Ittuiellibranclis. 



