50 
INSECT GALLERY. 
present. The majority have a cartilaginous skeleton. Among 
these may be specially mentioned the Bichir of the tropical 
African rivers, the Gar-Pike of North America, the Sturgeons, 
the Lung-Fishes (Dipnoi) of South America, Africa, and 
Australia, the Chimseras, and finally the Sharks and Eays. 
Among the two latter are included the singular Hammer- 
headed Shark (Zygmna), and the Saw- Fishes (Pristis), which 
have a long projecting flattened snout, with a row of teeth 
arranged something like those of a saw on each side (fig. 22). 
A remarkably large specimen from the coast of British Guiana 
of a species of this group (Pristis perrotteti) is exliibited. 
Another very small division of Fishes comprises the Lampreys 
and Hags, of which a few specimens are shown. 
The largest exhibited specimen of the class is the head of a 
full-grown example of the Great Basking Shark (Selaclie [or 
Cetorhimis] maxima, fig. 23), captured on the 2nd of March, 1875, 
near Shanklin, in the Isle of Wight. The length of the 
entire specimen was twenty-eight feet, but, as the minute size 
of the teeth indicate, it is a comparatively harmless animal. 
A smaller female specimen is suspended from the roof ; and 
below this is placed a model of the skeleton of the same species. 
Near by is a young specimen of another Basking Shark 
(Rhinodon ty pirns), which when adult is said to attain a length 
of at least fifty feet. It inhabits the Indian and Pacific Oceans. 
Models of some of the more remarkable types of Extinct 
Fishes are exhibited in one of the cases on the same side of the 
gallery. 
Insect Oallery. II. A small gallery is devoted to the group of Arthropoda or 
Invertebrate animals with jointed limbs, such as Lobsters, 
Crabs, Spiders, Centipedes, and Insects. 
At the south end of this gallery are exhibited specimens of 
Crabs and Lobsters. Among the former, special attention may 
be directed to the specimens of the Giant Crab (Macrochira) of 
Japan, and also to the Cocoanut Crab {Birgits latro, fig. 24), which 
feeds on young cocoanuts, and is related to the Hermit-Crabs. 
In the central table-cases, besides Crustacea (Crabs, Lobsters, 
etc.), are displayed the Scorpions and Spiders, including several 
examples of the large Bird-eating Spiders. 
The northern half of the gallery is devoted to the exhibited 
