HALL 25. 
INSECTS, CRUSTACEANS, MOLLUSKS. 
Wall -case 1. — Collection of crustaceans. Although the 
number of species is small, those represented are valuable and 
exemplify the strange modifications of form and structure which 
are found in this group. The barnacles, as an illustration, have 
little appearance of kinship to the lobsters and crabs; but studies 
of their early stages of development prove that they are true 
crustaceans. 
The glass models show several stages in the development of 
the lobster. In the south end of this case are several specimens 
of the horseshoe crab (Limulus), an animal more closely related 
to the trilobites so abundant in paleozoic times, than to the living 
crustaceans. 
Case 2. — A collection of about 2,000 butterflies and moths. 
Case 4. — With this case the visitor takes up again the mol- 
luscan series which he has been examining in the West Court (see 
page 126). Here are contained a portion of the Turbine llidce^ 
continued from Case 27, West Court ; Fasciolariidce ; Fusidcs 
(spindle-shells), and Mitridce (mitre-shells). 
Case 5. — Volutidce^ a family containing many large and 
beautifully colored shells. A rare shell is Valuta Junonia. It 
formerly sold for as much as $200; sells now for $8 or $10. Mar- 
ginellidcE. 
Case 6. — Harpidce (harp-shells); Olividce (olive-shells), great 
favorites with collectors; Pleura tomidce. 
Case 7. — Canidce (cones), an extensive family living mostly 
in warm seas. Few families make a handsomer collection than do 
the cones. Teribridce (augur-shells). 
Case 8.— Materials illustrating two groups of mollusks, many 
of whose members have the shell rudimentary or wanting en- 
tirely. The Nucleabranchiata are all pelagic animals, swimming 
at the surface of the sea. The Opisthabranchiata are also marine 
and are termed sea-slugs. Many of these animals are represented 
here by beautifully executed glass models. 
Case 9. — A number of families of air-breathing mollusks 
{Pulmanata), Stenagyridce, 
