13 N 



2803-2831. Trilobita. Xiphosura. Eurjrpterida. 

 Pantopoda. Tardigrada. Linguatulida. 



2803 Trilobita, etc. Comprehensive and General Works- 



ON ANY one or MORE OF THESE GrOUPS. 



2807 Trilobita, etc. Structure. 

 [For sub-divisions, see 0207.] 



2811 Trilobita, etc. Physiologv. 

 [For sub-divisions, see 0211.] 



2815 Trilobita, etc. Development. 

 [For sub-divisions, see 0215.] 



2810 Trilobita, etc. Ethology. 



[For sub-divisions, see 0219.] 



2823 Trilobita, etc. Variation and Etiology. 



[For sub-divisions, see 0213.] 



2827 Trilobita, etc. Geography. 



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



2831 Trilobita, etc. Taxonomy and Systematic. 



N.B. — On eacli slip should be indicated the one (or 

 more) of the above groups it refers to. 



Attention need not be given to divisions of any one 

 of the groups. 



3003-3031. Arachnida. 

 3003 Arachnida. General or Comprehensive Works. 



3007 Arachnida. Structure. 



[For sub-divisions, see 0207.] 



3011 Arachnida. Physiologv. 



[For sub-divisions, see 0211.] 



3015 Arachnida. Development. 



[For sub-divisions, see 0215.] 



3019 Arachnida. Ethology. 



[For sub-divisions, see 0219.] 



3023 Arachnida. Variation and Etiology. 

 [For sub-divisions, see 0223.] 



3027 Arachnida. Geography. 



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



3031 Arachnida. Taxonomy and Systematic. 



Arachnida consists of Scorpionida, Pedipalpi, Araneida, 

 Solifugae, Chernetida (or Pseudoscorpionesj, Phalan- 

 gida (or Opiliones), Acarida (or Acari), Palpigradi. 



Tardigrada are treated under 2803-2831. 



