254 MANUAL OF ZOOLOGY. 



NEMATODA. 



35. "On the Anatomy and Physiology of the Nematoids, parasitic and 



free, with observations on their Zoological Position," &c. H. C. 

 Bastian. 'Phil. Trans.' 1866. 



36. "Monograph of the Anguillulidae, or Free Nematoids, marine, land, 



and fresh-water, with descriptions of 100 New Species." H. C. 

 Bastian. 'Linnean Trans.' 1865. 



37. "The Microscopic Organisms found in the Blood of Man and Animals, 



and their Relations to Disease." Lewis. 1879. 



38. "The Life-History of Filaria Bancrofti," &c. T. Spencer Cobbold. 



'Journ. Linn. Soc.,' vol xiv. 1878. 



39. "On the Development of Filaria sanguinis-hominis, and on the Mos- 



quito considered as a Nurse." Manson. ' Journ. Linn. Soc.,' vol. 

 xiv. 1878. 



ROTIFERA. 



40. "Infusoria." Pritchard. 



41. " Die Infusionsthierchen. " Ehrenberg. 



42. "On the Manducatory Apparatus in the Rotifera." Gosse. 'Phil. 



Trans.' 1856. 



43. " The Crown Animalcule. " Gosse. 'Popular Science Review,' vol. 



i. 1866. 



44. "The Flower Animalcules." Gosse. 'Popular Science Review,' 



vol. i. 



45. "The Builder Animalcules." Gosse. 'Popular Science Review,' 



vol. i. 



46. "The Natural History of the Hairy-Backed Animalcules (Cluztono- 



tidce)" Gosse. ' Intellectual Observer. ' 1864. 



47. "Ueber den Ban und die Systematische Stellung der Rader-Thiere. " 



Frantz Leydig. ' Siebold and Kolliker's Zeitschrift.' 1854. 



48. " Hydatina senta." Cohn. ' Zeitschrift fur Wiss. Zool. ' 1855. 



49. " Anatomy of Rotifera. " Huxley. 'Trans. Micros. Soc.' 1853. 



50. " On Lacinularia socialis. " Huxley. 'Trans. Micros. Soc.' 1851. 



CHAPTER XXVII. 



ANARTHROPODA. 



THE division Anarthropoda includes the three classes of the 

 Spoon-worms (Gephyrca), the Ringed Worms (Annelida), and 

 the Arrow-worms (Chcztognatha), and constitutes the highest 

 section of the " Vermes " of modern zoologists. The members 

 of this division are characterised by the possession of an 

 elongated worm-like body, which usually shows a conspicuous 

 composition out of similar, or nearly similar, segments, which, 

 however, are not numerically definite. The nervous system, 

 in the typical members of the division, consists of a ventrally- 

 placed double chain of ganglia, one pair of ganglia correspond- 

 ing with each segment, the anterior pair being placed above 



