46 
WEST WING. 
of the largest known kinds of star-fish. The most beautiful 
and remarkable specimens in the gallery are the stalked Crinoids, 
which were collected by the " Challenger," and one found at- 
tached to an old telegraph wire which was taken up in the 
Caribbean Sea. These deep-sea forms, so abundant in earlier 
periods of the world's history, are exhibited on tables in the 
corners of the gallery, by case 7.* 
The wall-cases contain types of the very various and different 
groups which are put together as Worms or Vermes. Case 1 con- 
tains the Tape-worms or Cestoda, and the Flukes or Trematoda, 
the life history of a type of each being illustrated by specimens, 
figures, and models ; in case 2 the Eound-worms are illustrated 
by models of Trichina, and the anatomical structure of various 
other forms is shown by the aid of diagrams. Case 3 contains 
the free-living Terrestrial and Marine Worms, the Leeches, and 
Gephyreans. Case 4 is devoted to specimens of Echinodermata 
preserved in spirit, especially Holothurians, or sea-slugs and 
sea-cucumbers. 
Gallery, V. A large gallery is devoted to the extensive division of 
Mollusca, the exhibition of which is however mainly re 
stricted to their shells. In some cases the form of the animal 
itself is shown either by specimens in spirit or by means of 
models. 
The first table-case on the left as the gallery is entered contain 
the Argonauts, the beautiful pearly Nautilus, the rest of th 
Cephalopods (Octopus, Squids, &c), the fragile glassy Pteropods 
and the Cones, one of the most beautiful groups of the Gastro- 
pods, a division which includes Snails, Whelks, Slugs and all 
those Molluscs which crawl upon the under surface of their body. 
They are contained in cases 1-17. The Bivalves or those 
Mollusca which, like the Cockle and Oyster, are protected by a 
shell formed by two pieces or valves, are arranged in cases 
17-26. The most generally known of this division are the 
Venus-shells (case 17) ; the Cockles (case 19) ; the Giant Clam, 
sometimes weighing as much as 500 lbs. each (case 20) ; the 
Piddocks and Teredos, borers in wood and stone (case 19) ; 
the Kazor-shells (case 20); the Pinnas (case 24) ; Scallops 
and Thorny Oysters (case 25) ; and the True Oysters (case 25). 
* ' Guide to the Shell and Star-fish Galleries (Mollusca, Echinodermata, 
Vermes).' Price fourjjence. 
