92 
family containing over 6, 500 species. Many of the most attract- 
iv6 specimens in these cases are from the Phillipine Islands. 
Some species of Bulhnus reach a length of six inches. They lay 
large eggs which resemble those of birds, some of these are 
shown. 
Case 31. — Testacellidae, Lhnaeidae ( Slugs), a few families of 
Pteropoda. 
Case 32. — The Cephalopoda, a class which includes the Nau- 
tilus, the Squids, the Octopus and Argonauts. Specimens of a 
number of species in alcohol are in Case 2 in Hall 24. 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 is sus- 
pended overhead. In Hall 24 is a model of the Giant Octopus of 
the Pacific Coast of the United States. 
HALL 19. 
MAMMALS, 
Case 1. — Four representatives of the lower sub-class of mam- 
mals, the Prototheria. Of these the most interesting is the Duck- 
bill i^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. 
Phis case also contains members of the second sub-class of 
mammals, the Metatheria, order Marsupialia, These comprise 
the Phalangers, the Bandicoots, the Kangaroos, the Dasyures, 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” resemble 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-eating animals. The Dasy- 
ures are devourers of flesh. All the other animals belong to the 
sub-class Eutheria, and are continued in Case 2. 
