366 Phillips. — On the Development of 
I have also repeatedly found spermatia attached to the tricho- 
gyne, i. e. the true trichogyne, never to one of the trichogyne- 
like hairs. Between the carpogonium and the auxiliary cell, 
moreover, I am convinced that conjugation takes place by 
means of an ooblastema-tube. I have seen evidences of the 
existence of the tube, and have shown these preparations 
to others. 
With reference to the passage in the later writings of 
Schmitz (’92) upon the process of conjugation in Callithamnion , 
though the account is brief and unaccompanied by figures, 
Davis is mistaken in supposing that it is wanting in precision. 
Schmitz says, not that he is ‘ inclined to believe that ooblas- 
tema-filaments or their equivalent exist in Callithamnion i but 
that he obtained similar evidence of a real conjugation in 
Ceramiaceae, to that which had previously been obtained 
from Dudresnaya , Poly ides, Gloiosiphonia , Petrocelis , and other 
genera of Cryptonemiaceae. From my own observations 
I may add that I have seen this conjugation in several 
species, and I have certainly never found in any species of 
Rhodymeniales any procarp in which the carpogonium and 
auxiliary cell were so situated that conjugation could not take 
place between them by means of a short tube. 
To revert now to the comparison of Ptilota and Plumaria 
with other Ceramiaceae, it is clear that they correspond 
closely in the essentials of their procarpial structure to the 
primitive condition displayed in Antithamnion. The presence 
of a number of sterile filaments in the neighbourhood of the 
procarp usually terminating in hairs, as well as the presence 
of an involucre, show a considerable amount of specialization 
and departure from the simpler type. 
