DECIMAL CLASSIFICATION 
503.8 
9 
91 
02 
93 
rf. 
a 
oy 
9 
90 
504 
x 
2 
3 
3I 
32 
324 
320 
34 
6 
7 
+8 
1 
% 
g 
- 
"4 
56 
58 
6 
7 
71 
711 
712 
713 
Jr 
73 
74 
RK: 
Ctenophora Jelly fish 
Echinodermata 
Crinoidea, sea lilies 
Asteroidea, star fish 
Stelleridea 
Ophiuridea 
Echinoidea, sea urchins 
Holothuroidea, sea cucumbers 
Pedata 
Apoda 
Enteropneusta 
Mollusks 
Lamellibranchiata Bivalvs 
Scaphopoda Toothshells 
Gastropoda ~~ Univalvs: snails, slugs See also 632 Pests 
Amphineura Chitons 
Prosobranchia 
Aspidobranchia 
Pectinibranchia 
Heteropoda 
Opisthobranchia 
Nudibranchia 
Tectibranchia Sea hare, bubble shell 
Pulmonata Snails 
Pteropoda  Wingd shells 
Cephalopoda Squids and cuttlefish 
Tetrabranchia 
Nautilidae Nautilus 
Ammonites 
Dibranchia 
Octopoda 
Decapoda 
Molluscoidea 
Bryozoa (Polyzoa) Sea mats 
Gymnolaemata Sea mats 
Cyclostoma 
Ctenostomata 
Chilostomata 
Phylactolaemata 
Pterobranchia 
Entoprocta 
Brachiopoda Lamp shells