Invertebrata — Mollusca. 



Cap. XVI. 59.2 INVERTEBRATA. 



Cap. XVIII. 59.33 Coelenterata. 



Cap. XIX. 59.34 Spongiae, Porifera. 



34 Spongiae, Porifera | 34.4 Lithospongiae Tetractinellida 



.1 Myxospongiae 

 .2 Ceratospongiae 

 .3 Halichondriae, Monactinellida 



5 Hyalospongiae, Hexactinellida 

 .6 Calcispongiae 



Cap. XX. 59.35—38 Cnidaria. 



35 Cnidaria 



36 Actiuozoa 



.1 Rugosa, Tetracorallia. 

 .2 Alcyonaria, Octocorallia 

 .3 Zoantharia, Hexacorallia 

 .4 Antipatharia 

 .5 Actinaria 

 .6 Madreporaria 



37 Hydrozoa 



87.1 Hydromedusae, Graptolitha 



.2 Siphonophora 



.3 Acalephae 



.4 Calycozoa 



.6 Rhizostomidae 



.6 Marsupialida 



,7 Discophora 

 38 Ctenophora 



Cap. XXI. 59.39 Echinoderma (incL Enteropnensta). 



39 Echinoderma 



•1 Crinoidea, Pelmatozoa 

 .2 Asterozoa 

 .3 Asteroidea 

 •4 Ophiuroidea 



Cap. XXII. 59.4- 



4 Mollusca 



,1 Lamellibranchia 

 .2 Scaphopoda 

 .3 Gastropoda 

 .31 Amphineura 

 .32 Proaobranchia 

 .34 Heteropoda 

 •35 Opistliobranchia 

 .36 Nudibranchia 

 .37 Tectibrancbia 



