284 Mr. R. Garner on the Conario-hypophysial 
been in the direction and in the mode indicated? If so, cer- 
tainly a very easy way is discovered of solving a difficulty ; 
the morphology of a caterpillar agrees with that of the verte- 
brate ; and we are compelled to admit that a snail or a worm 
in reality creeps on its back, that the convex part of a lobster 
is on the ventral aspect, with its limbs reversed in their direc- 
tion to those of the vertebrates, &c. 
But another explanation, which still requires the Professor’s 
view of the conario-hypophysial tract and that the supra- 
cesophageal ganglion answers to the fore brain, yet implies the 
correctness of the old opinion as to the upper and lower sur- 
face in the sepia, appears to answer all requirements, embryo- 
logical, anatomical, and otherwise. ‘The accompanying sketch 
may be thought to be what the French call a vue schématique ; 
but it is true to nature (fig. 1). 
The subcesophageal ganglion in the invertebrate, projected 
forwards to correspond to the exterior or condition of existence, 
is composed of three constituents, marked out by the passage 
of the aorta :—the anterior one at the base of those prehensile 
and partly locomotive organs the feet or arms; in the middle 
the part supplying the external orifices of respiration (that is, 
