ix

THE REV. WILLIAM BUCKLAND, D. D. F. R. S.

CANON OF CHRIST CHURCH, AND PROFESSOR OF GEOLOGY IN THE
UNIVERSITY OF OXFORD.

ON GEOLOGY AND MINERALOGY.

THE REV. WILLIAM KIRBY, M. A. F. R. S.

ON THE HISTORY, HABITS, AND INSTINCTS OF ANIMALS.

WILLIAM PROUT, M.D. F. R. S.

CHEMISTRY, METEOROLOGY, AND THE FUNCTION OF DIGESTION, CONSIDERED WITH REFERENCE TO NATURAL THEOLOGY.

HIS ROYAL HIGHNESS THE DUKE OF SUSSEX, President of the Royal Society, having desired that no unnecessary delay should take place in the publication of the above mentioned treatises, they will appear at short intervals, as they are ready for publication.

shown externally.

a. a. a. Groves.

b. b. Alleys.

c. c. The lateral groves.

d. The intermediate one.

3. Inside of the same shell.

a. a. The dentated suture.

b. The middle ridge marked out on each
side into transverse pieces.

c. c. The alleys, with pores for the suckers.
d. One of the frames to which the jaws
are fixed.

4. Spines of Echinus cidaris.

a. Muscular fibres inserted in the base of

the spine, and surrounding the ball and 203-210 socket joint.

b. The muscular capsule laid open, and the

muscles attached to the base of the spine
turned back.

c. The origins of the muscles surrounding
the ball or tubercle.

d. One of the tubercles.

5. One of the suckers of E. esculentus.

a. The sucker; the pore in the centre is
supposed to be a spiracle connected.
with the respiration of the animal.

b. The stalk of the sucker.

6. The suture of a portion of the alleys at the

lateral grove, in which the transverse
pieces are convex.