84 QUESTIONS ON THE PEOTOZOxV. 



22. How do Acanthometrae differ from Thalassicollidae ? 



23. Give some account of the mode of propagation among the Gre- 



garinidce. 



24. Distinguish Vorticella from other stalked forms of Infusoria. 



25. What is meant by the terms, 'peristome,' 'vestibulum," pharynx,' 



and 'oesophagus,' as applied to the Infusoria ? 



26. In the simple form of Orbitolites, how are the segments of sar- 



code contained in the outermost zone connected with those of 

 the cells belonging to the zone immediately within it ? 



27. Give examples of Foraminifera in which the 'shell' is not cal- 



careous. 



28. Why are Sponges regarded as members of the Animal Kingdom ? 



29. Describe Gregarina Sieboldii. 



30. Mention some examples of Infusoria in which the digestive 



cavity is furnished with a second aperture. 



31. Distinguish 'vacuoles' from 'contractile vesicles.' 



2e. What is the nature of the so called ' fossil Infusoria ' ? 



33. What are ThalassicoUida? ? 



34. Of what geological period are Nummulites chiefly characteristic ? 



35. In what group of the Astomatous Protozoa has true reproduc- 



tion been proved to occur? 



36. Give examples of widely distributed Foraminifera. 



37. Define the terms, 'septum,' 'septal plane, and 'peripheral 



margin.' 



38. How is the digestive px-ocess effected in Actinophrys .? 



39. How in Vorticella ? 



40. Why ought all classifications of the Infusoria which have hitherto 



been proposed to be considered premature ? 



41. Describe the swarm spores of Spongilla. 



42. Explain the mode of growth of the shell in Miliolina. 



43. How is the growth of the shell supposed to take place in Orbito- 



lites? 

 4^ What position does the ' nucleus ' occupy in the body of an 

 Infusorium ? 



45. What is the position of the nucleolus ? 



46. What functions has Balbiani ascribed to these two organs ? 



47. What facts have induced him to infer that true reproduction 



occurs in Paramecium ? 



48. Describe NoctiluCv^ miliaris. 



49. Give a resume of Stein's account of the metamorphoses of Vor- 



ticella miscrostoma. 



50. What is the position of the urticating organs in Bursaria ? 



