Morse.] 366. [March 19, 
- Having shown that they were isolated trom the Lamellibranchs, he 
there said if the Brachiopods were rightly looked upon, they would, 
according to his opinion, not find their place in the Molluscan series 
at all, but in the series of annulated animals, and just in the class of. 
Annelids. In this class, however, he might not range them as a 
particular order, but as a link, or row of particular families, which 
one after the other came near to the now living Serpule, going 
slowly, without any abruptness, over to them. Steenstrup believed 
that if the relationship existing between the shells of Serpule and 
the tests of Thecidia, Crania, etc., was a natural one, then the type of 
the animal of Serpula might be recognized in the Brachiopoda. 
At that time, Steenstrup believed that the Hippurites were Anne- 
lids too. This view he informs me-he has since abandoned, though 
he regards them as a very alienated type from the Lamellibranchs. 
Tt seems strange, that in all the elaborate memoirs on the Brachio- 
pods, no allusion has been made to Steenstrup’s views on the subject. 
‘These allusions to the affinities of the Brachiopods in a language of 
which I was entirely ignorant, never came to my knowledge until 
nearly two years after my first views of the Annelidan affinities of 
the Brachiopods were published in “ Silliman’s Journal.” These 
views he presents every year to the students at the University at 
Copenhagen, for which he tells me he has been highly blamed, but to 
which he still adheres. 
In a lester to me he writes: —“ You remember that Seneca says, 
we ought always to go ‘Non pecorum modo, quo itur, sed quo eundum 
est.’ As to the last half of this sentence I must be quite silent, but 
as to the first half I shall add that I have been highly blamed, that I - 
did not follow the common ‘quo itur’ path.” » 
Conclusion and Recapitulation. 
The Mollusca have always proved a stubborn group to define, and 
simply because certain forms were placed with them, by general con- 
sent, which did not belong there. Milne Edwards first broke the spell 
by rendering the affinities of the lower classes less antagonistic by sep- 
arating the Mollusca into two great divisions, the Mollusca and Mol- 
luscoidea. This act was promptly adopted by Prof. Dana as before al- 
luded to in the first part of this paper. 
However vague and ill-defined the Vermes may be, there seems to 
be no wider gap between their extreme forms than between Amphi- 
