7 



Invertebrata — Mollusca. 



Cap. XVI. 59.2 INVERTEBRATA. 



81 Protozoa 

 .1 Rhizopoda 

 •2 Foraminifera 

 •3 Heliozoa 

 .4 Radiolaria 

 •5 Infusoria 

 .6 Flagellata 

 •7 Ciliata 



Cap. XVII. 59.31 Protozoa. 



31.75 Suctoria 

 .9 Sporozoa 

 .91 Gregarinidae 

 .92 Coccidia 

 .926 Haematozoa 

 .93 Sarcosporidia 

 .94 Myxosporidia 

 .95 Microsporidia 



Cap. XVIII. 59.33 Coelenterata. 

 Cap. XIX. 59.34 Spongiae, Porifera. 



34 Spongiae, Porifera 



.1 Myxospongiae 



.2 Ceratospongiae 



•3 Halichondriae, Monactînellida 



34.4 Lithospongiae Tetractinellida 

 .5 Hyalospongiae, Hexactinellida 

 .6 Calcispongiae 



Cap. XX. 59.35—38 Cnidaria. 



35 Cnidaria 



36 Actinozoa 



.1 Rugosa, Tetracorallia. 

 .2 Alcyonaria, Octocorallia 

 •3 Zoantharia, Hexacorallia 

 .4 Antipatharia 

 •5 Actinaria 

 .6 Madreporaria 



37 Hydrozoa 



37.1 Hydromedusae, Graptolitha 



•2 Siphonophora 



.3 Acalephae 



.4 Calycozoa 



•5 Rhizostomidae 



.6 Marsupialida 



.7 Discophora 

 38 Ctenophora 



Cap. XXI. 59.39 Echinoderma (incl. Enteropneusta). 



39 Echinoderma 



•1 Crinoidea, Pelmatozoa 

 •2 Asterozoa 

 •3 Asteroid ea 

 .4 Ophiuroidea 



Cap. XXII. 



4 Mollusca 



.1 Lamellibranchia 

 .2 Scaphopoda 

 .3 Gastropoda 

 .31 Amphineura 

 .32 Prosobranchia 

 .34 Heteropoda 

 .35 Opisthobranchia 

 •36 Nudibranchia 

 .37 Tectibranchia 



39.5 Echinoidea 

 .6 Holothurioidea 

 .7 Pedata, Elasipoda 

 .8 Apoda 

 .9 Enteropneusta 



59.4—4.5 Mollusca. 



4.38 Pulmonata 

 .4 Pteropoda 

 .5 Cephalopoda 

 .51 Tetrabranclua 

 .52 Nautiloidea 

 .53 Ammonitae 

 .55 Dibranchia 

 .56 Octopoda 

 .58 Decapoda. 



