FOSSIL INVERTEBRATES. 
79 
Protozoa, and Fossil Plants. In these last two galleries the 
British specimens are placed in the table-cases, and those of 
foreign origin in the cases round the walls. 
Among numerous other groups which cannot be mentioned 
great interest attaches to the Trilobites (fig. 56) of the Palaeozoic 
epoch. These creatures are related to the King-Crabs of the 
Moluccas, and both have affinity with the Scorpions. 
Very extensive is the collection of fossil plants from the 
Coal- Measures, among which Lepidodendron and Sigillaria, 
Fig. ^)'d.—\]rvEii (A) and Lower (B) Surfaces of Pterichthys. 
AN AR310URED DEVONIAN FiSH. 
;is well as numerous kinds of ferns, ai'e among the most 
common. 
The fifth gallery is set apart for the reception of certain Historical 
special collections of historical interest, either from the circum- Collections 
stances under which they were formed or came into possession 
of the Museum, or from their containing a large number of 
types described and figured in standard monographs. Hence 
it has been thought undesirable to break up and disperse these 
among the general collection. They include the original collection 
