94 
COLLECTION OF MOLLUSKS. 
The collection of Mollusca contains 7,000 species or more. 
It is believed to represent fairly well the subject of conchology. 
The collection is shown in 32 table cases, one to 16 being in the 
South Court, seventeen to 32 in Hall 25. In the arrangement 
of the families Dr. Paul Fischer’s classification has been fol- 
lowed in its reverse order. 
CASE 1. — This case contains a small collection of Brachi- 
poda; these are not Mollusca though in external form they re- 
semble the Lamellibranchiate shells. The Brachiopods were very 
numerous in earlier geological times. The Mollusca proper 
follow the Brachiopods in Case 1, the important families repre- 
sented are the AnaPinidae, Pandoridae, Tellinidae and the Teri- 
dinidae (Ship Worms), Piddocks, etc. Also examples of injury 
done submerged wood by the ship worms; Pholadidae (Burrow- 
ing Shells) ; Myidae (Soft shelled Clams). 
CASE 2. — Solenidae (Razor SheHs) ; Psammobiidae ; Dona- 
Adae (Wedge Shells). 
CASE 3. — Veneridae, a very large family which contains 
many beautiful shells ; Chamidae. 
CASE 4. — Cardiidae (Cockle shells) ; Tridacmidae (Giant 
Clams) ; two very large examples of this family can be seen in 
Hall 25. 
CASE 5. — Unionidae (River Mussels). 
CASE 6. — -Unionidae continued. 
CASE 7. — In this case is represented a collection of pearl- 
bearing shells from Wisconsin, also a number of pearls. It con- 
tains also representatives of the Arcidae (Ark shells). 
CASE 8. — Mytilidae (Mussels) ; AvicuUdae (Wing Shells), 
this family includes among other species the ‘'Pearl Oyster,” of 
which specimens are here shown. 
CASE 9. — Pectinidae (Scallop Shells) ; Spondylidat 
(Thorny oysters) ; these two families contain many shells which 
are interesting on account of their forms and their brilliant 
colors. 
CASE 10. — Ostreidae (Oysters) ; Dentaliidae (tooth-shells) ; 
Chitonidae (Chitons); Patellidae (Limpet Shells); FissurelU 
idae (Keyhole Limpets). 
CASE ll.—Haliotidae (Ear Shells, Ablone). 
