320 
DR. HENEAGE GIBBES. 
On the Structure of the Spermatozoon. By Heneage 
Gibbes, M.B. 
Since my last paper appeared in this journal in October, 
1879, I have had little time to make further researches into 
this subject. 
I have, however, examined the spermatozoa of several 
animals, such as rat, mouse, axolotl, pigeon, in all of 
which I have found the long filament formerly described ; 
also in the pigeon, where it resembles the Spermatozoon of 
an Amphibian on a smaller scale. 
I have examined a few Invertebrates, but so far have only 
found the filament in the snail and leech. In the snail 
it appears to be only a little longer than the tail ; this, 
however, is enormously long, which may account for it. 
In the fowl the Spermatozoa resemble that of the newt in 
shape, but the filament is very fine, and consequently indis- 
tinct. I have examined a few fish, but the spermatozoa were so 
small I could not make out anything satisfactorily. I have 
examined a number of specimens of the human spermatozoa, 
some taken from the testes twenty-four hours after death by 
accident, others from twelve to twenty-four hours after coi- 
tion ; these came by post, and I could detect no material 
difference in their structure, with the exception of the vary- 
