9 N 



1203-1231. Platyhelminthes. Mesozoa and Trichoplax. 



1203 Platyhelminthes, etc. Comprehensive and General 

 Works. 



1207 Platyhelminthes. Structure. 

 [For sub-divisions, see 0207.] 



1211 Platyhelminthes. Physiology". 



[For sub-divisions, see 0211.] 



1215 Platy^helminthes. Development. 



[For sub-divisions, see 0215. J 



1219 Platyhelminthes. Ethology. 



[For sub-divisions, see 0219.] 



1223 Platyhelminthes. Variation and Etiology. 



[For sub-divisions, see 0223.] 



1227 Platyhelminthes. Geography. 



[For sub-divisions, see J, 1 and 2.] 



1231 Platyhelminthes. Taxonomy and Systematic. 



Turbellaria. Trematoda. Cestoda. Nemertinea. 

 Mesozoa includes Dicyemidge, Orthonectidee. 

 Trichoplax is isolated. 



1403-1431. Nemathelminthes. 

 14:03 Nemathelminthes. Comprehensive and General 



VV^ORKS. 



1407 Nemathelminthes. Structure. 

 [For sub-divisions, see 0207.] 



1411 Nemathelminthes. Physiology. 



[For sub-divisions, see 0211.] 



1415 Nemathelminthes. Development. 

 [For sub-divisions, see 0215.] 



1419 Nemathelminthes. Ethology. 



[For sub-divisions, see 0219.] 



1423 Nemathelminthes. Variation and ^Etiology. 



[For sub-divisions, see 0223.] 



1427 Nemathelminthes. Geography^ 



[ Kor sub-divisions, see J, 1 and 2.] 



1431 Nemathelminthes. Taxonomy and Systematic. 



Nematoda. Nematomorpha (or Gordiidse). Acan- 

 thocephala. 



