FLOOR.] 
BRITISH ZOOLOGICAL COLLECTION. 
23 
Tables 11, 12. The Spiders, as the Mjgale, or Bird-catching Spider ; 
the Mining Spiders, which dig holes in clavej banks, and close them by 
a door hanging with a hinge ; the Scorpions ; the Ticks, one of which 
is parasitic on the Rhinoceros. The Centipedes and Millipedes, so 
called from the great number of their feet. 
Tables 13-24. Crustacea, such as the Land Crabs of the VVest 
Indies ; the Hermit Crabs, which live in shells; tbe Robber Crab or Tree 
Lobster, which climbs the cocoa-nut trees to get at the nuts ; the Lob- 
sters and Cray-fish ; the Glass Crabs found in the tropical parts of the 
ocean; the King Crabs of America and the Chinese seas. 
FIFTH EOOM. 
The Wall Cases contain the Ganoid and Cartilaginous Fishes, viz. : 
the Sturgeons of Europe and America, the Fohjpterus of Tropical 
Africa, and the Bony Pikes (Lepidobteus) of the North American 
Freshwaters, covered with scales, hard and polished as ivory ; the 
African Mudfish (Lepidosiren), with four long threadlike limbs; in 
summer, before the water is dried up, it buries itself in the mud and 
forms a case in which it lies torpid until the rainy season begins; the 
Barramunda (Ceratodus), a fish hitherto known from fossil teeth only, 
but recently discovered living in Queensland ; the Cartilaginous Fish, 
such as the Sharks and Rays ; the Torpedo or Numb-fish, which 
defend themselves by means of an electric apparatus on each side 
of the head ; the Sturgeons of the Russian and American rivers ; 
the long and flat-snouted Polyodon of the Mississippi. On the top 
of the Cases are the saws of various Saw-fish, and specimens of the 
larger Cartilaginous fish, also some of the larger Sponges, such as 
Neptune's Cup. In the Table Cases are exhibited various kinds of 
Sponges which belong to an extensive class of living beings, mostly 
microscopic, in which the distinctive character of the Animal or of 
the Vegetable is not fully developed. 
JOHN EDWARD GRAY. 
