Case 10. — Stenogyridce, continued. The genus Achatina 
contains some of the largest known air-breathing shells. Most of 
the species live in Africa, where they remain in trees, descending 
to lay their eggs. Some of the eggs are exhibited. Pupida ; 
Bulimulidce. 
Cases 11, 12 and 13. — Representatives of the very ex- 
tensive family of Helicidce. Over 6,500 species of this family 
have been described. All are air-breathers, inhabiting all coun- 
tries, except those very cold. Many of the most attractive species 
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 14:. — Pteropoday mollusks inhabiting the open sea. 
The shell is often absent; LimaeidcE (the slugs). 
Case 15. — The Cephalopoday a class which includes the 
nautilus, the squids, the species of octopus and the argonauts. 
Specimens of a number of species in alcohol are in one of the 
wall-cases. Shells of the nautilus have been sectioned so as to 
show the internal structure. A considerable number of the soft 
cephalopoda are represented by means of glass models. A model 
of the giant squid of the coast of Newfoundland is suspended 
overhead. In Hall 24 is a model of the giant octopus of the Paci- 
fic coast of the United States. 
HALL 24. 
SPONGES, JELLY FISH, CORALS, ETC. 
In this Hall are exhibited the materials illustrating the branches 
of the animal kingdom known as the Protozoa^ the Poriferay the 
Coelenterata^ and the Echinodermata. 
Case 1. — In the south end of this case area few specimens of 
the lowest forms of animal life. The Protozoa^ almost wholly 
animals of microscopic size. These are illustrated by models, 
faithful representations of these animals magnified 2,300 times. 
Next in order are the Poriferay or sponges. These include 
some interesting forms, such as Neptune’s cup, the glass-rope 
sponge, Venus’ flower basket, etc. 
