42 
5. Mention some Brachiopod shells common to all Geological 
periods, and some peculiar to Silurian, Devonian, or Carboniferous 
rocks, with their characters. 
6. Mention the genera of plants in the Coal, and give their 
characters. And name the specimens on the table. 
1. Neuropteris . 
2. Michelinea. 
3. Calymene . 
4. Temnocheilus . 
5. JLithostrotion . 
7. Describe the following genera : — Pentacrinus , Apiocrinus, 
Bourgueticrinus , Marsupites ; give the strata they characterize 
and their range in time. 
8. Describe the sections, and groups of the Belemnitidm. 
What species are peculiar to the Lias, Inferior Oolite, Oxford 
Clay, and Chalk ? 
9. To what division and families of the Echinidm do the fol- 
lowing genera belong ? 
Cidaris. 
Jlemicidaris. 
Salenia. 
Diadema . 
Echinobrissus . 
Clypeus. 
Micraster . 
Give the characters of any of these ; any marked peculia- 
rities they possess, and their range in time. 
1 0. What families of Corals are well illustrated in the Secondary 
and Tertiary epochs ? Name those genera that characterize the 
Lias, Inferior Oolite or Cornbrash, Coral Eag, Lower Greensand, 
and London Clay, and give their more obvious characters. 
11. Construct a table, showing the sections and groups of the 
Ammonites as defined by their external form, and draw lines to 
represent the range of the groups in time. 
12. What genera of the Star Fishes characterize the Lias, 
Chalk and London Clay ? Give the prominent characters of each 
genus named. 
Thomas H. Huxley. 
EXAMINATION IN APPLIED MECHANICS. 
20 th April 1861. 
1. Mention the two curves that are commonly employed for 
the shape of the teeth of wheels. Are they the only forms that 
can be used for the purpose ? 
2. Define a right-hand screw and a left-hand screw. 
3. Explain the worm-wheel and worm. 
4. How arc right-handed and left-handed screws combined in 
the coupling link of railway carriage ? Describe the link. 
