3. Snakes, Lizards, Turtles and Frogs. 
4. Crustaceans. 
5. Turtles. 
6. Alligators. 
7. Lizards and snakes. 
8. Fishes. 
a. Alligator Gar. 
b. Tropical American Fishes. 
c. Basses and Perches. 
d. Grunts, Snappers and Goat Fishes. 
e. Parrot Fishes and Wrasses. 
f. Trumpet and Scorpion Fishes. 
g. Trigger Fishes and their Allies. 
h. Atlantic Food and Game Fish. 
i. Mackerels. 
j. Flyingfish, Pike and Eels. 
k. Salmon, Herring and Carp. 
l. Sturgeons. 
m. Pacific Game Fish. 
n. Chicago Market Fish. 
o. Sharks and Rays. 
p. Tiger Shark and Tropical American Fishes. 
q. Freshwater Game Fish. 
Shrews and Mice, Group. Between Halls 18 and 19. 
Arctic Animals, Group. Between Halls 19 and 20. 
F. Hall 19. Shells and Insects. 
(East to West) 
1. Shells. 
The arrangement is systematic. 
a. Cephalopods. 
(1) Argonauts, Devil-fishes (Argonautidae, Oc- 
topodidae). 
(2) Spirula, Cuttles, Squids. (Spirulidae, Loli- 
ginidae, Sepiidae). 
(3) Chambered Nautilus (Nautilidae). 
b. Univalves and Chitons. North side of hall. 
The number of shell families in this class is very 
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