24 



Rec.ipitiilatioii. 



Araclinida .• 1. 



Trilobitit! 72. 



Merostoma 3. 



Phyllocarida 5. 



Ostracoda 52. 



Cirrhipedia 1. 



Annelida 48. 



Cephalopoda 37. 



Pteropoda 10. 



Gastropoda 192. 



Pelecypoda 58. 



Brachiopoda 150. 



Bryozoa ....' 47. 



Asteroidea 4. 



Crinoidea 180. 



Hydroidea 1. 



Anthozoa 68. 



Graptolithae 8. 



Stroinatoporida (>. 



Spongiae 15. 



Incert?e Sedis 2. 







960 species. 



But the real number, when all species awaiting description have been 

 studied, cannot fall much short of 1500 species. The only groups which have 

 been tolerably completely worked out are the Cruslacea, the Gastropoda, the 

 Brachiopoda and the Crinoidea. 



