90 
In the four corners of this court and under the gallery at 
north end are arranged table cases one to twenty containing 
shells. The remaining cases containing shells are in room 25, for 
an account of which see page 91. 
COLLECTION OF MOLLUSKS. 
The collection of Molusca contains some 7,000 species or 
more. It is believed to represent fairly well the subject of con~ 
chology. The collection is shown in thirty-two table cases, one to 
twenty being in the south court, twenty-one to thirty-two in hall 
25. In the arrangement of the families Dr. Paul Fischer’s classi- 
fication has been followed in its reverse order. 
Case 1. — This case contains a small collection of Brachipoda, 
these are not Mollusca though in external form they resemble 
the Lamellibranchiate shells. The Brachipods were very numer- 
ous in earlier geological times. The Mollusca proper follow the 
Brachipods in Case i, the important families represented are the 
Anatinidae, Pandoridae, Tellinidae and the Teridinidae (Ship 
Worms) piddocks, etc. Also examples of injury done submerged 
wood by the ship worms. 
Case 2. — Pholadidae (Burrowing Shells); Myidae ; Solen- 
idae : (Razor Shells) Psammobiidae. 
Case 3: — Donacidae (Wedge Shells) ; VeneridaCyO^ very large 
family which contains many beautiful shells. 
Case 4. — Veneridae Chamidae\ Car diidae {Ccckle 
Shells.) 
Case 5 i—Cardiidae continued: Tridacnidae (Giant Clams.) 
Two very large examples of this family can be seen in hall 25: 
(River Mussels.) 
Case 6, — Unionidae continued. In this case is represented a 
collection of pearl-bearing shells from Wisconsin, also a number 
of pearls. 
Case 7, — Unionidae continued; Arcidae (Ark Shells.) 
Cases. — Mytilidae (Mussels); Aviculidae (Wing Shells), 
this family includes among other species the -‘Pearl Oyster,” of 
which specimens are here shown. 
Case 9 . — Pectinidae {^coXlo^ Shells); Spondylidae (Thorny 
Oysters. ) These two families contain many shells which are in- 
teresting on account of their forms and their brilliant colors. 
