1200-1231 Platyhelminthes. Mesozoa and 
Trichop lax. 
The principal divisions are : — 
Platyhelminthes (Turbellaria, 
Trematoda, Cestoda, Nemertinea) ; 
Mesozoa (Dicyemidae, Orthonec- 
tidae) ; Trichoplax. 
1400-1431 Nemathelminthes. 
The principal divisions arc : — 
Nematoda ; Nematomorplia (or 
Gordiidae) ; Acanthocephala. 
1000-1031 Chaetognatha. Rotifera. Gas- 
trotricha. Kinorhyncha (or 
Echinodera.) 
1800-1831 Archiannelida. Polychaeta. 
Myzostomaria. Oligochaeta. 
Gephyrea. Phoronis. Hirudinea. 
2000-2031 Brachiopoda. Bryozoa (or 
Polyzoa). 
The principal divisions are : — 
Brachiopoda. 
Bryozoa : Entoprocta ; Ecto- 
procta (Gymnolaema : Cyclosto- 
mata, Trepostomata, Cryptosto- 
mata, Cheilostomata, Ctenosto- 
mata ; Phylactolaema). 
2200-2231 Mollusca. 
The principal divisions are : — 
Lamellibranchiata (or Pelecypoda) 
(Order should he given) ; Scapho- 
poda ; Amphineura. 
Gastropoda includes Prosobran- 
chiata (Rhipidoglossa, Ptonoglossa, 
Taenioglossa, Rachiglossa, Toxo- 
glossa) ; Heteropoda ; Opisthobran- 
chiata (Tectibranchiata, Nudi- 
branchiata) ; Pteropoda ; Pulmo- 
nata (Bassomatophora, Stylom- 
inatophora). Families of Proso- 
branchiata and Pulmonata should be 
mentioned. See Cambridge Natural 
History. 
Cephalopoda includes Nauti- 
loidea, Ammonoidea, Dibranchiata. 
2400-2431 Arthropoda. 
2431 will not include a systematic 
arrangement of genera and species. 
Platyhelminthes. Mesozoa und Tri- 
choplax. 
Hauptabteilungen sind : — 
Platyhelminthes (Turbellaria, 
Trematoda, Cestoda, Nemertinea) ; 
Mesozoa (Dicyemidae, Orthonec- 
tidae) ; Trichoplax. 
Nemathelminthes. 
Hauptabteilungen sind : — 
Nematoda ; Nematomorpha (oder 
Gordiidae) ; Acanthocephala. 
Chaetognatha. Rotifera. Gas- 
trotricha. Kinorhyncha (oder 
Echinodera). 
Archiannelida. Polychaeta. Myzo- 
stomaria. Oligochaeta. Gephyrea 
Phoronis. Hirudinea. 
Brachiopoda. Bryozoa (oder 
Polyzoa). 
Hauptabteilungen sind : — 
Brachiopoda. 
Bryozoa : Endoprocta ; Ecto- 
procta (Gymnolaema : Cyclosto- 
mata, Trepostomata, Cryptosto- 
mata, Cheilostomata, Ctcnosto- 
mata ; Phylactolaema). 
Mollusca. 
Hauptabteilungen sind : — 
Lamellibranchiata (oder Pelecy- 
poda) (Ordnung angeben) ; Sca- 
phopoda ; Amphineura. 
Gastropoda umfasst Prosobran- 
chiata (Rhipidoglossa, Ptonoglossa, 
Taenioglossa, Rachiglossa, Toxo- 
glossa ; Heteropoda ; Opisthobran- 
chiata (Tectibranchiata, Nudi- 
branchiata ) ; Pteropoda ; Pulmo- 
nata (Bassomatophora, Stylom- 
matophora). Familien der Proso- 
branchiata und Pulmonata angeben. 
Siehe Cambridge Natural History. 
Cephalopoda umfasst Nautiloidea, 
Ammonoidea, Dibranchiata. 
Arthropoda. 
2431 wird eine systematische 
Anordnung der Gattungcn und Arten 
nicht enthalten. 
