DEPARTMENT OF ZOOLOGY 
loS 
Cases 28, 29, 30, and 31. — HelicidcB (Air-breathers), a 
large family containing over 6500 species. Many of the most 
attractive specimens in these cases are from the Philippine 
Islands. Some species of Bulimus reach a length of six inches. 
They lay large eggs, which resemble those of birds; some of 
these are shown. 
Case 32. — TestacelHdce\ LimacidcE (Slugs), a few families 
of Pteropoda and the Cephalopoda, a class which includes the 
Nautilus, the Squids, the Octopus and Argonauts. A few of 
the soft Cephalopoda are represented by means of glass models. 
A model of the Giant Squid of the coast of New Foundland and 
the Giant Octopus of the Pacific Coast of the United States are 
suspended overhead in Hall 24. 
HaU 19. 
MAMMALS. 
Case i. — Four representatives of the lower sub-class of 
mammals, the Prototheria. Of these the most interesting is the 
Duck-bill (Ornithorhynchus) . It is so called on account of its 
duck -like beak. It is a native of Australia. It is aquatic in its 
habits and swims with facility. Although a true mammal, the 
remarkable fact has been discovered that it lays eggs instead 
of producing living young. The Echidnas, or Spiny Ant-eaters, 
are inhabitants of New Guinea, Tasmania and Australia. 
This case also contains members of the second sub-class of 
mammals, the Metatheria, order Marsupialia. These comprise 
the Phalangers, the Bandicoots, the Kangaroos, the Dasymes, 
all inhabitants of Australia, Tasmania, and New Guinea, and the 
Opossums, dwellers in the Americas. They present many 
strange and interesting forms of life. The Phalangers usually 
live in trees and have prehensile tails. Some species subsist on 
vegetation, others on insects. The “flying phalangers” resem- 
ble our flying squirrels, in having a fold of skin which acts as a 
parachute. The Bandicoots {Perameles) burrow in the earth 
and subsist on roots and grain. The Kangaroos are grass-eat- 
ing animals. The Dasyures are devourers of flesh. All the 
other animals belong to the sub-class Eutheria, and are con- 
tinued in Case 2, and the two cases in the center of the room. 
Case 2. — Contains Edentates {Bruta). Among the Eden- 
tates shown are Armadillos, the strangely armored Pichiciago 
