DESIDERATA, ETC. Xxix 
which Echmus lividus excavates the rocks on which it is found, 
and to report the results to the next Meeting. 
4. That the following subjects of inquiry be recommended to 
the consideration of zoologists : 
a. The use of horns in the class Mammalia; the reason of 
their presence in the females of some and their absence 
in those of other species ; the connexion between their 
development and sexual periods ; the reason of their 
being deciduous in some tribes and persistent in others. 
b. The use of the lachrymal sinus in certain families of the 
Ruminantia*. 
c. The conditions which regulate the geographical distribu¬ 
tion of Mammalia. 
d. The changes of colour of hair, feathers, and other ex¬ 
ternal parts of animals ; how these changes are effected 
in parts usually considered by anatomists as extra- 
vascular. 
e. The nature and use of the secretions of certain glands 
immediately under the skin, above the eyes, and over 
the nostrils, in certain species of the Grallatores and 
Ncitatores; the nature and use of the secretion of the 
uropygial gland. 
/. How long and in what manner can the impregnated ova 
of Fishes be preserved, for transportation, without 
preventing verification when the spawn is returned to 
water. 
g. Further observations on the supposed metamorphosis of 
Decapod Crustacea , with reference to the views of 
Thompson and Rathke f. 
h. The situation of the sexual organs in male Spiders, and 
on their supposed connexion with the palpi J. 
i. The use of the antennae in Insects. Are they organs of 
hearing, of smell, or of a peculiar sensation ? 
k. The function of the femoral pores in Lizards, and the 
degree of importance due to them as offering charac¬ 
ters for classification. 
5. That botanists in all parts of Great Britain and Ireland be 
invited to compose and communicate to the Meetings of the Asso¬ 
ciation, Catalogues of local Floras, with indications of those 
species which have been recently introduced , of those which are 
* See Dr. Jacob’s remarks, Reports, vol. iv. p. 208. 
f See essays by Mr. Westwood and Mr. Thompson in Phil. Trans. 
J See Mr. J. Blackwall’s paper, Reports, vol. ii. p. 444. 
