gives rise to the spine, being at the top of the upper fin, and both
fins being developed on the same side of it. Lopsidedness as such,
therefore, was not to be regarded as an embryological character in
ancient fishes; what might be regarded as such was the absence of a bony
sheath to the end of the "chorda" found in the more developed fishes.
Further traces of this bony structure were shown to exist, among other
piscine resemblances, in the Amphibia. Finally the embryological facts
now observed in the development of the bones of the skull were of great
importance,] "as they enable us to understand, on the one hand, the
different modifications of the palato-suspensorial apparatus in fishes,
and on the other hand the relations of the components of this apparatus
to the corresponding parts in other Vertebrata," [fishes, reptiles, and
mammals presenting a well-marked series of gradations in respect to this
point.

This part of the paper had grown out of the investigations begun for the
essay on the Vertebrate Skull, just as that on Jacare and Caiman from
inquiry into the scales of Stagonolepis.

Thus he was still able to devote most of his time to original research.
But though in his letter of March 27, 1855, below, he says,] "I never
write for the Reviews now, as original work is much more to my taste,"
[it appears from jottings in his 1859 notebook, such as "Whewell's
'History of Scientific Ideas,' as a Peg on which to hang Cuvier
article," [that he again found it necessary to supplement his income by
writing. He was still examiner at London University, and delivered six
lectures on Animal Motion at the London Institution and another at
Warwick. This lecture he had offered to give at the Warwick Museum as
some recognition of the willing help he had received from the assistants
when he came down to examine certain fossils there. On the way he