The Mollusca are arranged in the desk cases round the gallery railing in the first gallery. The collection prises about 2,500 different species exhibited to the as well as a large number of small species of no particular interest, which are not exhibited. Extinct genera mounted on wood.

Cases 34 and 35

contain the Cephalopoda, the Pteropoda, and the Heteropoda. Among the first we have the Paper Nautilur (Argonauto argo), both animal and shell; the Octopus (Octopus vulgaris), the Squid (Loligo vulgaris), the [unclear: Sepia] (Sepia officinalis), and the extinct Belemnites, which page 25 very much resembled the Sepia, but of which only the internal shell is preserved. The recent species are illustrated by very accurate glass models, as it is impossible to exhibit real specimens so that they can be understood.

In Case 35 we have the Nautilus (Nautilus pompiliut) and the extinct genera of Ammonites, Orthoceras, &c.

The Pteropoda are oceanic animals that swim by means of two fin-like arms. The glass model of Clio borealis will explain the shape of the animal; the rest are only shells The Heteropoda are also free swimming oceanic molluscs, but swim by means of their foot. Dentalium is sometimes put into a separate order.

Cases 36 to 52

contain the Marine Gasteropoda, arranged according to Dr. Chenu's Manual. Those in which the shell is rudimentary or wanting (Opisthobranchs) will be found in Case 52.

Cases 53 to 57

contain the Land and Freshwater Univalves and Bivalves. It will be noticed how dull and uniform are their colours in comparison with the Marine forms.

Cases 58 to 65

contain the Marine Lamellibranchiata or Bivalves.

Case 66

contain the Brachiopoda or Lamp Shells. It will be noticed that in this case there are more extinct than recent forms.

Cases 67 to 73

contain the collection of New Zealand Shells, which see proper heading.